LK2540-9ERB1G - BEL POWER SOLUTIONS

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

MELCHER

The Power Partners.

BCD20002-G Rev AF1, 17-Apr-2018 Page 1 of 31

Features

• RoHS lead-free-solder and lead-solder-exempted

products available.

•5 year warranty for RoHS compliant products with an

extended temperature range

•Compliant with EN 50155, EN 50121-3-2

•Fire & smoke according to EN 45545 and NF-F-16 (vers.

V108 or later; not models with H15-S4 connector)

•Class I equipment

•Extremly wide input voltage ranges from 8 to 385 VDC,

and 85 to 264 VAC, 47 to 440 Hz

•Input over- and undervoltage lockout

•Adjustable output voltage with remote on/off

•1 or 2 outputs: SELV, no load, overload, and short-

circuit proof

•Rectangular current limiting characteristic

•PCBs protected by lacquer

•Very high reliability

168

6.6"

3.2"

16 TE

111

4.4"

3 U

Safety-approved to the latest edition of IEC/EN 60950-1

and UL/CSA 60950-1

Description

The K Series of DC-DC and AC-DC converters represents a

broad and flexible range of power supplies for use in advanced

electronic systems. Features include high efficiency, high

reliability, low output voltage noise and excellent dynamic

response to load/line changes. LK models can be powered by

DC or AC with a wide-input frequency range (without PFC).

The converter inputs are protected against surges and

transients. An input over- and undervoltage lockout circuitry

disables the outputs, if the input voltage is outside of the

specified range. Certain types include an inrush current limiter

preventing circuit breakers and fuses from tripping at switch-

on.

All outputs are open- and short-circuit proof, and are protected

against overvoltages by means of built-in suppressor diodes.

The output can be inhibited by a logic signal applied to pin 18

(i). The inhibit function is not used, pin 18 must be connected

with pin 14 to enable the outputs.

LED indicators display the status of the converter and allow for

visual monitoring of the system at any time.

Full input-to-output, input-to-case, output-to-case, and output

to output isolation is provided. The converters are designed,

built, and safety-approved to the international safety standards

IEC/EN 60950-1. They are particulary suitable for railway

applications and comply with EN 50155 and EN 50121-3-2.

The case design allows operation at nominal load up to 71 °C

with natural cooling. If forced cooling is provided, the ambient

temperature may exceed 71 °C, but the case temperature must

remain below 95 °C.

A temperature sensor generates an inhibit signal, which

disables the outputs when the case temperature TC exceeds

the limit. The outputs are automatically re-enabled, when the

temperature drops below the limit.

Various options are available to adapt the converters to

individual applications.

The converters may either be plugged into a 19" DIN-rack

system according to IEC 60297-3, or be chassis mounted.

Important: For applications requiring compliance with IEC/EN

61000-3-2 (harmonic distortion), please use our LK4000 or

LK5000 Series with incorporated power factor correction (PFC).

Table of Content s Page Page

Description .......................................................................... 1

Model Selection .................................................................. 2

Functional Description ........................................................ 4

Electrical Input Data............................................................ 5

Electrical Output Data ......................................................... 8

Auxiliary Functions............................................................ 12

Electromagnetic Compatibility (EMC) ............................... 15

Immunity to Environmental Conditions ............................. 17

Mechanical Data ............................................................... 18

Safety and Installation Instructions................................... 2 0

Description of Options ...................................................... 23

Accessories....................................................................... 30

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

MELCHER

The Power Partners.

BCD20002-G Rev AF1, 17-Apr-2018 Page 2 of 31

Table 1c: Models DK, EK, LK

Output 1 Output 2 Input Voltage Effic.1Input Voltage Effic.1Input Voltage Effic.1Options

Vo nom Io nom Vo nom Io nom Vi min – Vi max ηη

ηη

ηmin Vi min – Vi max ηη

ηη

ηmin Vi min – Vi max ηη

ηη

ηmin

[VDC] [A] [VDC] [A] 44 – 220 VDC [%] 67 – 385 VDC [%] 88 – 372 VDC [%]

100 – 240 VAC

5.1 25 – – DK1001-9ERG 80 --- -- LK1001-9ERG 79 -74, P, D, V 2, T, K7,

12 12 – – DK1301-9ERG 83 EK1301-9ERG 83 LK1301-9ERG 83 B, B1, non-G

12.84 5 10 – – DK1740-9ERG 5 83 --- -- LK1740-9ERG 5 83

15 10 – – DK1501-9ERG 85 EK1501-9ERG 84 LK1501-9ERG 84

24 6 – – DK1601-9ERG 86 EK1601-9ERG 86 LK1601-9ERG 85

12 6 12 3 6 DK2320-9ERG 81 EK2320-9ERG 82 LK2320-9ERG 81 -74, P, D, T

15 5 15 3 5 DK2540-9ERG 83 EK2540-9ERG 83 LK2540-9ERG 83 B, B1, non-G

24 3 24 3 3 DK2660-9ERG 84 EK2660-9ERG 84 LK2660-9ERG 82

25.68 6 2.5 25.68 3 6 2.5 DK2740-9ERG 6 84 --- -- LK2740-9ERG 6 83

1Min. efficiency at Vi nom, Io nom and TA = 25 °C. Typical values are approximately 2% better.

2Option V for models with 5.1 V outputs; excludes option D

3Second output semi-regulated

4AK, BK, FK models are available as -7 or -9, but without opt. E. The other models CK, DK, EK, LK are available as -7 or -9E (but not -7E).

5Battery loader for 12 V batteries. Vo is controlled by the battery temperature sensor (see Accessories) within 12.62 – 14.12 V. Options P

and D are not available.

6Battery loader for 24 V (and 48 V batteries with series-connected outputs). Vo is controlled by the battery temperature sensor (see

Accessories) within 25.25 – 28.25 V (50.5 – 56.5 V for 48 V batteries). Options P and D are not available.

7Option K is available only for LK with 5.1 V output in order to avoid the H15S4 connector. Efficiency is approx. 1.5% worse.

NFND: Not for new designs Preferred for new designs

Model Selection

Non-standard input/output configurations or special customer adaptations are available on request.

Table 1a: Models AK

Output 1 Output 2 Input Voltage Efficiency1Options

Vo nom Io nom Vo nom Io nom Vi min – Vi max ηη

ηη

ηmin

[VDC] [A] [VDC] [A] 8 – 35 V D C [%]

5.1 20 – – AK1001-9RG 79 -74, P, D, V 2, T, B, B1, non-G

12 10 – – AK1301-9RG 81

15 8 – – AK1501-9RG 83

24 5 – – AK1601-9RG 84.5

12 5 12 3 5 AK2320-9RG 79 -74, P, D, T, B, B1, non-G

15 4 15 3 4 AK2540-9RG 80.5

24 2.5 24 3 2.5 AK2660-9RG 80.5

Table 1b: Models BK, FK, CK

Output 1 Output 2 Input Voltage Effic.1Input Voltage Effic.1Input Voltage Effic.1Options

Vo nom Io nom Vo nom Io nom Vi min – Vi max ηη

ηη

ηmin Vi min – Vi max ηη

ηη

ηmin Vi min – Vi max ηη

ηη

ηmin

[VDC] [A] [VDC] [A] 14 – 7 0 VD C [%] 20 – 100 VDC [%] 28 – 140 VDC [%]

5.1 25 – – BK1001-9RG 80.5 FK1001-9RG 80 CK1001-9ERG 80 -74, P, D, V 2, T,

12 12 – – BK1301-9RG 83 FK1301-9RG 82 CK1301-9ERG 82 B, B1, non-G

15 10 – – BK1501-9RG 84 FK1501-9RG 85 CK1501-9ERG 85

24 6 – – BK1601-9RG 85 FK1601-9RG 86 CK1601-9ERG 86

12 6 12 3 6 BK2320-9RG 80 FK2320-9RG 81 CK2320-9ERG 81 -74, P, D, T,

15 5 15 3 5 BK2540-9RG 82 FK2540-9RG 83 CK2540-9ERG 84 B, B1, non-G

24 3 24 3 3 BK2660-9RG 82 FK2660-9RG 84 CK2660-9ERG 84

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

MELCHER

The Power Partners.

BCD20002-G Rev AF1, 17-Apr-2018 Page 3 of 31

Example: CK2540-9ERD3TB1G: DC-DC converter, operating input voltage range 28 – 140 VDC, 2 electrically isolated

outputs, each providing 15 V, 5 A, input current limiter E, control input R to adjust the output voltages, undervoltage

monitor D3, current share feature T, cooling plate B1, and RoHS-compliant for all six substances.

Product Marking

Basic type designation, applicable approval marks, CE mark,

warnings, pin designation, patents and company logo,

identification of LEDs, test sockets, and potentiometer.

Part Number Description

Operating in put voltage Vi:

8 – 35 VDC................................................................AK

14 – 70 VDC..............................................................BK

20 – 100 VDC............................................................ FK

28 – 140 VDC........................................................... CK

44 – 220 VDC .......................................................... DK

67 – 385 VDC ...........................................................EK

100 – 240 VAC (rated voltage) or 88 – 372 VDC...... LK

Number of outputs .......................................................... 1, 2

Nominal voltage of output 1 (main output) Vo1 nom

5.1 V............................................................................ 0

12 V ............................................................................ 3

15 V ............................................................................ 5

24 V ............................................................................ 6

Other voltages 1....................................................... 7, 8

Nominal voltage of output 2 Vo2 nom

None (single-output models) ..................................... 01

12 V, 12 V .................................................................. 2 0

15 V, 15 V .................................................................. 4 0

24 V, 24 V .................................................................. 6 0

Other specifications or additional features 1 ...... 21 – 99

Operational ambient temperature range TA:

–25 to 71 °C ............................................................... -7

–40 to 71 °C ............................................................... -9

Other 1 ...............................................................-0, -5, -6

Auxiliary functions and options:

Inrush current limitation ............................................. E 2

Output voltage control input.......................................R 3

Potentiometer (output voltage adjustment)................P 3

Vi / Vo monitor (D0 – DD, to be specified 1)................D 4

ACFAIL signal ........................................................... V 4

Current share control ................................................... T

H15 standard connector for 5.1 V output models ...... K5

Cooling plate standard case .............................. B or B1

Cooling plate for long case 220 mm 1 ......................B2 1

RoHS-compliant for all 6 substances6.................................. G

1Customer-specific models

2Option E is mandatory for all -9 models, except AK, BK, FK.

3Feature R excludes option P and vice versa. Option P is not available for battery charger models.

4Option D excludes option V and vice versa; option V is available for single-output models with 5.1 V only.

5Option K is available for single-output models with 5.1 V output to avoid the expensive H15-S4 connector.

Note: The sequence of options must follow the order above. This part number description is descriptive only; it is not intended for

creating part numbers.

CK 2 5 40 -9 E R D3 T B1 G

Specific type designation, input voltage range, nominal output

voltages and currents, degree of protection, batch no., serial

no., and data code including production site, modification

status (version), and date of production.

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

MELCHER

The Power Partners.

BCD20002-G Rev AF1, 17-Apr-2018 Page 4 of 31

Control circuit

Opt. P

Forward converter

(approx. 120 kHz)

Output 2

filter

Output 1

filter

–+

Vi+

Vi–

03058b

Vo1+

Vo1–

Vo2+

Vo2–

Input filter

Fuse

Bridge

rectifier

Functional Description

The input voltage is fed via an input fuse, an input filter , a bridge

rectifier (LK models only), and an inrush current limiter to the

input capacitor. This capacitor sources a single-transistor

forward converter with a special clamping circuit and provides

also the power during the hold-up time.

Each output is powered by a separate secondary winding of the

main transformer. The resultant voltages are rectified and their

ripple smoothed by a power choke and an output filter. The

control logic senses the main output voltage Vo1 and

generates, with respect to the maximum admissible output

currents, the control signal for the switching transistor of the

forward converter.

The second output of double-output models is tracking the

main output, but has its own current limiting circuit. If the main

output voltage drops due to current limitation, the second

output voltage will fall as well and vice versa.

Standard models with a single 5.1 V output have a syn-

chronous rectifier to provide good efficiency.

Fig. 1

Block diagram of single-output converters

1Transient suppressor (VDR)

2Suppressor diode (AK, BK, FK models)

3Inrush current limiter (NTC, only for models with TA min = –25 °C ) or option E (for CK, DK, EK, LK models only)

4LK models only

Fig. 2

Block diagram of double-output models

1Transient suppressor (VDR)

2Suppressor diode (AK, BK, FK models)

3Inrush current limiter (NTC, only for models with TA min = –25 °C ) or option E (for CK, DK, EK, LK models only)

4LK models only

Input filter

Control circuit

Opt. P

Forward converter

(approx. 120 kHz)

Output

filter

–+

Vi+

Vi–

D/V

03057b

S+

Vo+

Vo–

S–

Fuse

Bridge

rectifier

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

MELCHER

The Power Partners.

BCD20002-G Rev AF1, 17-Apr-2018 Page 5 of 31

Electrical Input Data

General Conditions

–TA = 25°C, unless TC is specified.

– Pin 18 connected to pin 14, Vo adjusted to Vo nom (if option P); R input not connected.

– Sense line pins S+ and S– connected to Vo+ and Vo– respectively.

Table 2a: Input data

Input AK BK FK Unit

Characteristics Conditions min typ max min typ max min typ max

ViOperating input voltage Io = 0 – Io nom 8 3514 7020 100VDC

Vi nom Nominal input voltage TC min –TC max 15 30 50

IiInput current Vi nom, Io nom 1 9.0 6.0 3.75 A

Pi 0 No-load input power Vi min – Vi max 2.5 2.5 2.5 W

Pi inh Idle input power unit inhibited 1.5 1.5 1.5

RiInput resistance TC = 25 °C 65 100 70 m Ω

RNTC NTC resistance 2 no NTC no NTC no NTC

CiInput capacitance 832 1040 300 370 1200 1500 µF

Vi RFI Conducted input RFI EN 55022 A A B

Radiated input RFI Vi nom, Io nom AAA

Vi abs Input voltage limits 0 40 0 84 0 100 VDC

without damage

Table 2b: Input data

Input CK DK EK LK Unit

Characteristics Conditions min typ max min typ max min typ max min typ max

ViOperating input voltage Io = 0 – Io nom 28 140 44 220 67 385 88 372 VDC

TC min – TC max 854(230) 2644VAC

Vi nom Nominal input voltage 60 110 220 3104VDC

IiInput current Vi nom, Io nom 1 3.0 1.6 0.8 0.57 A

Pi 0 No-load input power Vi min – Vi max 2.5 2.5 2.5 2.5 W

Pi inh Idle input power unit inhibited 1.5 1.5 1.5 4.5

RiInput resistance TC = 25 °C 150 170 180 480 m Ω

RNTC NTC resistance 2 1000 2000 4000 4000

CiInput capacitance 960 1200 264 330 216 270 216 270 µF

Vi RFI Conducted input RFI EN 55022 B B B B

Radiated input RFI Vi nom, Io nom AAAA

Vi abs Input voltage limits 0 154 0 400 3 0 400 –400 400 VDC

without damage

1Both outputs of double-output models are loaded with Io nom.

2Valid for -7 versions without option E (-9 versions exclude NTC). This is the nominal value at 25 °C and applies to cold converters at initial

switch-on cycle. Subsequent switch-on/off cycles increase the inrush current peak value.

3For 1 s max.

4Rated input voltage range is 100 – 240 VAC (nominal 230 VAC). Nominal frequency range is 50 – 60 Hz; operating frequency range is 47

– 440 Hz (440 Hz for 115 V mains). For frequencies ≥63 Hz, refer to Installation Instructions.

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

MELCHER

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BCD20002-G Rev AF1, 17-Apr-2018 Page 6 of 31

Input Transient Protection

A suppressor diode or a VDR (depending upon the input

voltage range) together with the input fuse and a symmetrical

input filter form an effective protection against high input

transient voltages which, typically occur in most installations,

but especially in battery-driven mobile applications.

Standard nominal battery voltages are: 12, 24, 36, 48, 60, 72,

110, and 220 V. Railway batteries are specified with a tolerance

of –30% to +25%, with short excursions up to ±40%.

In certain applications, additional surges according to RIA 12

are specified. The power supply must not switch off during

these surges, and since their energy can practically not be

absorbed, an extremely wide input range is required. The EK

input range for 1 10 V batteries has been designed and tested to

meet this requirement.

Input Fuse

A fuse mounted inside the converter protects against severe

defects. This fuse may not fully protect the converter, when the

input voltage exceeds 200 VDC. In applications, where the

converters operate at source voltages above 200 VDC, an

external fuse or a circuit breaker at system level should be

installed.

Table 3: Fuse Specification

Model Fuse type Reference Rating

AK fast-blow 1Littlefuse 314 30 A, 125 V

BK fast-blow 1 Littlefuse 314 25 A, 125 V

FK slow-blow 2 Schurter SPT 16 A, 250 V

CK slow-blow 2 Schurter SPT 12.5 A, 250 V

DK slow-blow 2 Schurter SPT 8 A, 250 V

EK, LK slow-blow 2 Schurter SPT 4 A, 250 V

1Fuse size 6.3 × 32 mm 2 Fuse size 5 × 20 mm

Fig. 3

Typical inrush current versus time at Vi max, Rext = 0

Ω

For AK, BK, FK, and for application-related values, use the

formula in this section to get realistic results.

123 t [ms]

100

Ii inr [A]

150

EK, LK

05108a

0.1

Inrush Current Limitation

The CK, DK, EK, and LK models incorporate an NTC resistor in

the input circuitry, which at initial turn-on reduces the peak

inrush current value by a factor of 5 – 10, such protecting

connectors and switching devices from damage. Subsequent

switch-on cycles within short periods will cause an increase of

the peak inrush current value due to the warming-up of the

NTC resistor. See also Option E.

The inrush current peak value (initial switch-on cycle) can be

determined by following calculation; see also fig. 3:

Vi source

Iinr p = ––––––––––––––––

(Rs ext + Ri + RNTC)

Fig. 4

Equivalent input ciruit

Rs ext RiRNTC

Iinr p

Vi source

+Ci int

05109a

Static Input Current Characteristic

2345

0.5

___

Vi min

Ii [A]

04044a

LK (DC input)

Reverse Polarity

The converters (except LK models) are not protected against

reverse polarity at the input to avoid unwanted power losses. In

general, only the input fuse will trip.

LK models are fully protected by the built-in bridge rectifier.

Fig. 5

Typical input current versus relative input voltage

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

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BCD20002-G Rev AF1, 17-Apr-2018 Page 7 of 31

234561

0.1

___

i min

[ms]

100

CK/FK

AK BK

04045a

Fig. 6a

Typical hold-up time th versus relative DC input voltage.

Vi/Vi min. DC-DC converters require an external series diode

in the input path, if other loads are connected to the same

input supply lines.

Input Under-/Overvoltage Lockout

If the input voltage remains below approx. 0.8 Vi min or exceeds

approx. 1.1 Vi max, an internally generated inhibit signal

disables the output(s). When checking this function, the

absolute maximum input voltage Vi abs should be observed.

Between Vi min and the undervoltage lock-out level the output

voltage may be below the value defined in table Electrical

Output data.

Hold-Up Time

Fig. 6b

Typical hold-up time th versus relative AC input voltage (LK

models)

2341

______

i min

[ms]

100

04049a

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

MELCHER

The Power Partners.

BCD20002-G Rev AF1, 17-Apr-2018 Page 8 of 31

[V]

5.1

o nom

JM049

0.15 1.0

∆V

Models with diodes

Models with synchr.

rectifier

Electrical Output Data

General Conditions:

–TA = 25 °C, unless TC is specified.

– Pin 18 (i) connected to pin 14 (S– or Vo1–), R input not connected, Vo adjusted to Vo nom (option P),

– Sense line pins 12 (S+) and 14 (S–) connected to pins 4 (Vo1+) and 8 (Vo1–), respectively.

Table 5: Output data of single-output models

Model AK – LK1001 AK – LK130 1/17 405AK – LK1501 AK – LK1601 Unit

Nom. output voltage 5.1 V 12 V / 12.84 V515 V 24 V

Characteristics Conditions min typ max min typ max min typ max min typ max

VoOutput voltage Vi nom, Io nom 5.07 5.13 11.93512.075 14.91 15.09 23.86 24.14 V

Vo BR Overvoltage protection 6.0

15.2/17.5

519.6 28.5

(suppressor diode)7

Io nom Output current nom. 1Vi min – Vi max 206/25 105 6/12 86/10 56/6 A

TC min – TC max

IoL Output current limit Vi min – Vi max 216/26 10.25 6/12.2 8.26/10.2 5.26/6.2

voOutput Low f re q u ency8Vi nom, Io nom 5 555 mV

noise 3

Switching frequ.

BW = 20 MHz 10 5 5 5

Total incl. spikes

80 50 70 100

∆Vo u Static line regulation Vi min – Vi max ±15 ±20 ±25 ±30 mV

with respect to Vi nom Io nom

∆Vo I Static load regulation2Vi nom –202–30 –40 –50

(0.1 – 1) Io nom

vo d Dynamic Voltage Vi nom ±150 ±130 ±130 ±150

load deviation 9 Io nom ↔ 1/2 Io nom

t d regulat. 9 Re covery time90.3 0.4 0.4 0.3 ms

αVo Temperature coefficient TC min – TCmax ±0.02 ±0.02 ±0.02 ±0.02 %/K

of output voltage 4 Io nom

1If the output voltages are increased above Vo nom through R-input control, option P setting, remote sensing or option T, the output currents

should be reduced accordingly so that Po nom is not exceeded.

2See fig. 7 below !

3Measured according to IEC/EN 61204 with a probe according to annex A

4For battery charger applications, a defined negative temperature coefficient can be provided by using a temperature sensor (see

Accessories), but we recommend choosing the special battery charger models.

5Especially designed for battery charging using the temperature sensor (see Accessories). Vo is set to 12.84 V ±1% (R-input open)

6Values for AK models

7Breakdown voltage of the incorporated suppressor diode (1 mA; 10 mA for 5 V output). Exceeding Vo BR is dangerous for the

suppressor diode.

8LK models only (twice the input frequency)

9See Dynamic load regulation

Fig. 7

Output voltage regulation for models with synchronous

rectifier and with diode rectifier

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

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The Power Partners.

BCD20002-G Rev AF1, 17-Apr-2018 Page 9 of 31

1Values for AK models

2If the output voltages are

increased above Vo nom via R-

input control, option P setting,

remote sensing, or option T, the

output currents should be

reduced accordingly, so that

Po nom is not exceeded.

3Measured according to IEC/EN

61204 with a probe annex A

4See Dynamic Load Regulation

5See Output Voltage Regulation

of Double-Output Models

6For battery charger

applications, a defined negative

temperature coefficient can be

provided by using a

temperature sensor; see

Accessories.

7Especial ly designed for battery

charging using the battery

temperature sensor; see

Accessories.

Vo1 is set to 25.68 V ±1% (R-

input open-circuit).

8Breakdown voltage of the

incorporated suppressor diodes

(1 mA). Exceeding Vo BR is

dangerous for the suppressor

diodes.

9LK models only (twice the

input frequency)

Table 6b: Output data of double-output models. General conditions as per table 5.

Model AK – LK2660 / 2740 7 Unit

Nom. output voltage 2 ××

××

× 24 V / 2 ××

××

× 25.68 V 7

Output 1 Output 2

Characteristics Conditions min typ max min typ max

VoOutput voltage

i nom

, I

o1 nom

, I

o2 nom

23.86 7 24.14 7 23.64 7 24.36 7 V

Vo BR8Overvoltage protection 28.5/ 347 28.5/347

(suppressor diode)

Io nom Output current nom. 2 Vi min – Vi max 2.51 7/3 2.51 7/3 A

TC min – TC max

IoL Output current limit 10 Vi min – Vi max

2.71 7/3.2

voOutput Low frequency9Vi nom, Io nom 5 5 mVpp

noise 3 Switching freq. BW = 20 MHz 5 5

Total incl. spikes 80 80

∆Vo u Static line regulation Vi min – Vi max ±30 5mV

with respect to Vi nom Io nom

∆Vo I Static load regulation Vi nom –60 5

(0.1 – 1) Io nom

vo d Dynamic Voltage Vi nom ±100 ±150

load deviation 4 Io1 nom ↔ 1/2 Io1 nom

t d regulat.

Recovery time4

1/2 Io2 nom 0.2 ms

αvo Temperature coefficient TC min – TC max ±0.02 %/K

of output voltage 6 Io nom

Table 6a: Output data of double-output models. General conditions as per table 5.

Model AK – LK2320 AK – LK2540 Unit

Nom. output voltage 2 ××

××

× 12 V 2 ××

××

× 15 V

Output 1 Output 2 Output 1 Output 2

Characteristics Conditions min typ max min typ max min typ max min typ max

VoOutput voltage

i nom

, I

o1 nom

, I

o2 nom

11.93 12.07 11.82 12.18 14.91 15.09 14.78 15.22 V

Vo BR 8Overvoltage protection 15.2 15.2 19.6 19.6

(suppressor diode)

Io nom Output current nom.2Vi min – Vi max 51/6 51/6 41/5 41/5 A

TC min – TC max

IoL Output current limit 10 Vi min – Vi max 5.21/6.2 5.21/6.2 4.21/5.2 4.21/5.2

voOutput Low f requency9Vi nom, Io nom 55 5 5mV

noise 3 Switching freq. BW = 20 MHz 5555

Total incl. spikes 40 40 50 50

∆Vo u Static line regulation Vi min – Vi max ±20 5±25 5mV

with respect to Vi nom Io nom

∆Vo I Static load regulation Vi nom –40 5–50 5

(0.1 – 1) Io nom

vo d Dynamic Voltage Vi nom, ±100 ±150 ±100 ±150

load deviation 4 Io1 nom ↔ 1/2 Io1 nom

t d regulat.

Recovery time4

1/2 Io2 nom 0.2 0.2 ms

αVo Temperature coefficient TC min – TC max ±0.02 ±0.02 %/K

of output voltage 6 Io nom

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

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BCD20002-G Rev AF1, 17-Apr-2018 Page 10 of 31

o nom

0.98

0.5

0.5 1.0

o nom

05098a

0.2

0.4

0.6

0.8

50 60 70 80 90 100

Io/Io nom

TA [°C]

1.0

Forced

cooling

05089a

TA min

TC max

Convection cooling

Fig. 8

Output current derating versus temperature for -7 and -9

models.

Thermal Considerations

If a converter is located in free, quasi-stationary air (convection

cooling) at the indicated maximum ambient temperature TA max

(see table Temperature specifications) and is operated at its

nominal input voltage and output power, the temperature

measured at the Measuring point of case temperature TC (see

Mechanical Data) will approach the indicated value TC max a fter

the warm-up phase. However, the relationship between TA and

TC depends heavily upon the conditions of operation and

integration into a system. The thermal conditions are

influenced by input voltage, output current, airflow, and

temperature of surrounding components and surfaces. TA max is

therefore, contrary to TC max, an indicative value only.

Caution: The installer must ensure that under all operating

conditions TC remains within the limits stated in the table

Temperature specifications.

Notes: Sufficient forced cooling or an additional heat sink allows TA

to be higher than 71 °C (e.g., 85 °C), as long as TC max is not

exceeded. Details are specified in fig. 8.

applied overvoltages. Overload at any of the output s will cause

a shut-down of all outputs. A red LED indicates the overload

condition.

Note: Vo BR is specified in Electrical Output Data. If this voltage is

exceeded, the suppressor diode generates losses and may

become a short circuit.

Parallel and Series Connection

Single- or double-output models with equal output voltage can

be connected in parallel using option T (current sharing). If the

T pins are interconnected, all converters share the output

current equally.

Single-output models and/or main and second outputs of

double-output models can be connected in series with any

other (similar) output.

Notes:

– Parallel connection of double-output models should always

include both, main and second output to maintain good

regulation.

– Not more than 5 converters should be connected in parallel.

– Series connection of second outputs without involving their main

outputs should be avoided, as regulation may be poor.

– The maximum output current is limited by the output with the

lowest current limitation when several outputs are connected in

series.

Fig. 9

Output characteristic Vo versus Io (single-output models or

double-output models with parallel-connected outputs).

Thermal Protection

A temperature sensor generates an internal inhibit signal,

which disables the outputs, when the case temperature

exceeds TC max. The outputs automatically recover, when the

temperature drops below this limit.

Continuous operation under simultaneous extreme worst-case

conditions of the following three parameters should be

avoided: Minimum input voltage, maximum output power, and

maximum temperature.

Output Protection

Each output is protected against overvoltages, which could

occur due to a failure of the internal control circuit. Voltage

suppressor diodes (which under worst case condition may

become a short circuit) provide the required protection. The

suppressor diodes are not designed to withstand externally

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Fig. 11

Models with 2 outputs 12 V: V

versus I

with various I

(typ)

Fig. 12

Models with 2 outputs 15 V: V

versus I

with various I

(typ)

Fig. 13

Models with 2 outputs 24 V: V

versus I

with various I

(typ)

Fig. 10

Typical dynamic load regulation of Vo.

Output Voltage Regulation

figure 10 applies to single-output or double-output models with

parallel-connected outputs.

For independent configuration, output 1 is under normal

conditions regulated to Vo nom, irrespective of the output

currents.

Vo2 depends upon the load distribution. If both outputs are

loaded with more than 10% of Io nom, the deviation of Vo2

remains within ± 5 % of Vo1. Fig. 11 to 13 show the regulation

depending on load distribution.

Two outputs of a double-output model connected in parallel

behave like the output of a single-output model.

Note: If output 2 is not used, connect it in parallel with output 1!

This ensures good regulation and efficiency.

0123456

14.0

14.25

14.5

14.75

15.0

15.25

15.5

15.75

= 5.0 A

= 3.75 A

= 2.5 A

= 1.25 A

= 0.5 A

05106a

Io2 [A]

Vo2 [V]

0 0.5 1 1.5 2 2.5 3 3.5

23.5

24.5

25.5

26 Io1 = 3 A

Io1 = 2 A

Io1 = 1 A

Io1 = 0.5 A

Io1 = 0.3 A

05107a

Io2 [A]

Vo2 [V]

01234567

Io2 [A]

11.2

11.4

11.6

11.8

12.0

12.2

12.4

12.6

Vo2 [V]

Io1 = 6.0 A

Io1 = 4.5 A

Io1 = 3.0 A

Io1 = 1.5 A

Io1 = 0.6 A

05105a

±1% V

±1%

≥10 µs ≥10 µs

0.5

o nom

05102c

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Inhibit

0.1

Vo/Vo nom

trtf

06001

1.6

0.8

–0.8

Vinh [V]

Iinh [mA]

–40 0

–20 20 40

2.0

1.2

0.4

–

0.4

Vinh = 0.8 V

Vo = on Vo = off

Vinh = 2.4 V

06032a

Auxiliary Functions

Inhibit for Remote On/Off

The outputs may be enabled or disabled by means of a logic

signal (TTL, CMOS, etc.) applied between the inhibit input i

(pin 18) and pin 14 (S– or Vo1–). In systems with several

converters, this feature can be used to control the activation

sequence of the converters. If the inhibit function is not

required, connect the inhibit pin 18 with pin 14!

Note: If pin 18 is not connected, the output is disabled.

Fig. 14

Definition of Vinh and Iinh.

Table 7: Inhibit characteristics

Characteristic Conditions min typ max Unit

Vinh Inhibit Vo = on Vi min – Vi max –50 0.8 V

voltage Vo = off 2.4 50

Iinh Inhibit current Vinh = 0 –400 µA

trRise time 30 m s

tfFall time depending on Io

Fig. 16

Output response as a function of inhibit control

Fig. 15

Typical inhibit current Iinh versus inhibit voltage Vinh

Table 7: Maximum voltage compensation allowed using

sense lines

Output Total voltage difference Voltage difference

voltage between sense lines and between

their respective outputs Vo– and S–

5.1 V <0.5 V <0.25 V

12 V, 15 V, 24 V <1.0 V <0.25 V

Vi+

Vi– S–/Vo1–

Vo+

Iinh

Vinh

06031a

Sense Lines (Single-Output Models)

Important: Sense lines must always be connected! Incorrectly

connected sense lines may activate the overvoltage protection

resulting in a permanent short-circuit of the output.

This feature allows for compensation of voltage drops across

the connector contacts and if necessary, across the load lines.

We recommend connecting the sense lines directly at the

female connector.

To ensure correct operation, both sense lines (S+, S–) should

be connected to their respective power outputs (Vo+ and V o–),

and the voltage difference between any sense line and its

respective power output (as measured on the connector)

should not exceed the following values:

Programmable Output Voltage (R-Function)

As a standard feature, the converters offer an adjust able output

voltage, identified by letter R in the type designation. The

control input R (pin 16) accepts either a control volt age Vext or a

resistor Rext to adjust the desired output voltage. When input R

is not connected, the output voltage is set to Vo nom.

a)Adjustment by means of an external control voltage Vext

between pin 16 (R) and pin 14 (S–):

The control voltage range is 0 – 2.75 VDC and allows for an

adjustment in the range of approximately 0 – 110% of Vo nom.

Vext ≈ –––––– • 2.5 V

Vo nom

Fig. 17

Output voltage control for single-output models

Vext

Vi+

Vi–

Rext

R'ext

S+/Vo1+

S–/Vo1–

05074a

Vi–

Vi+

–

S–/Vo1–

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Table 8a: Rext for Vo < Vo nom; approximate values (Vi nom, Io nom, series E 96 resistors); R'ext = not fitted

Vo nom = 5.1 V Vo nom = 12 V Vo nom = 15 V Vo nom = 24 V

Vo [V] Rext [kΩΩ

ΩΩ

Ω]Vo [V] 1 Rext [kΩΩ

ΩΩ

Ω]Vo [V] 1 Rext [kΩΩ

ΩΩ

Ω]Vo [V] 1 Rext [kΩΩ

ΩΩ

Ω]

0.5 0.432 2 4 0.806 2 4 0.619 4 8 0.81

1.0 0.976 3 6 1.33 4 8 1.47 6 12 1.33

1.5 1.65 4 8 2 6 12 2.67 8 16 2.0

2.0 2.61 5 10 2.87 8 16 4.53 10 20 2.87

2.5 3.83 6 12 4.02 9 18 6.04 12 24 4.02

3.0 5.76 7 14 5.62 10 20 8.06 14 28 5.62

3.5 8.66 8 16 8.06 11 22 11 16 32 8.06

4.0 14.7 9 18 12.1 12 24 16.2 18 36 12.1

4.5 30.1 10 20 20 13 26 26.1 20 40 20

5.0 200 11 22 42.2 14 28 56.2 22 44 44.2

Table 8b: R’ext for Vo > Vo nom; approximate values (Vi nom, Io nom, series E 96 resistors); Rext = not fitted

Vo nom = 5.1 V Vo nom = 12 V Vo nom = 15 V Vo nom = 24 V

Vo [V] R'ext [kΩΩ

ΩΩ

Ω]Vo [V] 1 R'ext [kΩΩ

ΩΩ

Ω]Vo [V] 1 R'ext [kΩΩ

ΩΩ

Ω]Vo [V] 1 R'ext [kΩΩ

ΩΩ

Ω]

5.15 432 12.1 24.2 1820 15.2 30.4 1500 24.25 48.5 3320

5.2 215 12.2 24.4 931 15.4 30.8 768 24.5 49.0 1690

5.25 147 12.3 24.6 619 15.6 31.2 523 24.75 49.5 1130

5.3 110 12.4 24.8 475 15.8 31.6 392 25.0 50.0 845

5.35 88.7 12.5 25.0 383 16.0 32.0 316 25.25 50.5 698

5.4 75 12.6 25.2 316 16.2 32.4 267 25.5 51.0 590

5.45 64.9 12.7 25.4 274 16.4 32.8 232 25.75 51.5 511

5.5 57.6 12.8 25.6 243 16.5 33.0 221 26.0 52.0 442

13.0 26.0 196 26.25 52.5 402

13.2 26.4 169 26.4 52.8 383

1First column: Vo or Vo1; second column: double-output models with series-connected outputs

ext

Vo1–

Vo1+

Vo2–

Vo2+

–

24 V

30 V

48 V

06004a

Fig. 18

Double-output models:

Wiring of the R-input for output voltages 24 V, 30 V, or 48 V

with both outputs in series. A ceramic capacitor (Co) across

the load reduces ripple and spikes.

b) Adjustment by means of an external resistor:

Depending upon the value of the required output voltage,

the resistor shall be connected

either: Between pin 16 and pin 14 to achieve an output

voltage adjustment ra nge of approximately 0 – 100% of Vo nom.

or: Between pin 16 and pin 12 to achieve an output voltage

adjustment range of 100 – 110% of Vo nom.

Warnings:

–Vext shall never exceed 2.75 VDC.

– The value of R'ext shall never be less than the lowest value as

indicated in table R'ext (for V0 > V0 nom) to avoid damage to the

converter!

Notes:

– The R-Function excludes option P (output volt age adjustment by

potentiometer).

If the output voltages are increased above Vo nom via R-input

control, option P setting, remote sensing, or option T, the output

currents should be reduced, so that Po nom is not exceeded.

– With double-output models, the second output follows the

voltage of the controlled main output.

– In case of parallel connection the output voltages should be

individually set within a tolerance of 1 – 2%.

Test Sockets

Test sockets (pin diameter 2 mm) for measuring the main

output voltage Vo or Vo1 are located at the front of the converter .

The positive test socket is protected by a series resistor (see:

Functional Description, block diagrams).

The voltage measured at the test sockets is slightly lower than

the value at the output terminals.

K Series Data Sheet

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BCD20002-G Rev AF1, 17-Apr-2018 Page 14 of 31

2.10

2.15

2.20

2.25

2.30

2.35

2.40

2.45

Cell voltage [V]

–20 –10 0 10 20 30 40 50 °C

06139b

VC = 2.27 V, –3 mV/K VC = 2.27 V, –3.5 mV/K

VC = 2.23 V, –3 mV/K VC = 2.23 V, –3.5 mV/K

Vo safe

Display Status of LEDs

Battery Charging /Temperature Sensor

All converters with an R-input are suitable for battery charger

applications, but we recommend choosing the models

especially designed for this application DK/LK1740 or DK/

LK2740; see Model Selection.

For optimal battery charging and life expectancy of the battery

an external temperature sensor can be connected to the R-

input. The sensor is mounted as close as possible to the

battery and adjusts the output voltage according to the battery

temperature.

Depending upon cell voltage and the temperature coef ficient of

the battery, different sensor types are available, see

Accessories.

Fig. 21

Trickle charge voltage versus temperature for defined

temperature coefficient. Vo nom is the output voltage with open

R-input.

Fig. 20

Connection of a temperature sensor

Fig. 19

LED indicators

LEDs "OK", "i" and "Io L

" status versus input voltage

Conditions: Io ≤ Io nom, TC ≤ TC max, Vinh ≤ 0.8 V

Vi uv = undervoltage lock-out, Vi ov = overvoltage lock-out

LEDs "OK" and "Io L" status versus output current

Conditions: Vi min – Vi max, TC ≤ TC max, Vinh ≤ 0.8 V

LED "i" versus case temperature

Conditions: Vi min – Vi max, Io ≤ Io nom, Vinh ≤ 0.8 V

LED "i " versus Vinh

Conditions: Vi min – Vi max , Io ≤ Io nom, TC ≤ TC max

Power

supply Load

–

Input Vo–

Temperature sensor

03099d

Battery

Vo+

> 0.95 to 0.98 V

o1 adj

i max

i ov

i min

i uv

i abs

> 0.95 to 0.98 V

o1 adj

o nom

o L

< 0.95 to 0.98 V

o1 adj

C max

PTC threshold

i inh

+50 V

+0.8 V +2.4 V

-50 V

inh threshold

o L

LED off LED on

LED Status undefined

06002a

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

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Table 9: Electromagnetic immunity (type tests)

Phenomenon Standard Level Coupling Value Waveform Source Test In Perf.

mode 1applied imped. procedure oper. crit.2

Supply related RIA 12 3A4+i/–i 3.5 VBat 2/20/2 ms 0.2 Ω1 positive surge yes A

surge B 1.5 VBat 0.1/1/0.1 s

Direct transients C + i/ –i , –i / c 960 Vp10/100 µs 5 Ω5 pos and 5 neg. yes B

D31800 Vp5/50 µs

E 3600 Vp0.5/5 µs 100 Ω

F 4800 Vp0.1/1 µs

G38400 Vp0.05/0.1 µs

Indirect couples H +o/c, – o/c 1800 Vp5/50 µs

transients J 3600 Vp0.5/5 µs

K 4800 Vp0.1/1 µs

L 8400 Vp0.05/0.1 µs

Electrostatic IEC/EN 45contact discharge ±8000 Vp1/50 ns 330 Ω, 10 positive and yes A

discharge 61000-4-2 air discharge ±15000 Vp150 pF 10 negative

(to case) discharges

Electromagnetic IEC/EN x6antenna 20 V/m AM 80% /1 kHz n.a. 80 – 1000 MHz yes A

field 61000-4-3 7antenna 20 V/m AM 80% /1 kHz n.a. 800 – 1000 MHz yes A

10 V/m 1400 – 2100 MHz

5 V/m 2100 – 2500 MHz

3 antenna 10 V/m 50% duty cycle, n.a. 900 ±5 MHz yes A

200 Hz rep. rate

Electrical fast I EC/E N 38capacitive, o/c ±2000 Vpbursts of 5/50 ns 50 Ω60 s positive yes A

transients/burst 61000-4-4 4±i/c, +i /–i ±4000 Vp2.5/5 kHz over 60 s negative

direct 15 ms; burst transients per

period: 300 ms coupling mode

Surges IEC/EN 39±i/c ±2000 Vp1.2/50 µs 12 Ω5 pos. and 5 neg. yes A

61000-4-5 +i/–i ±1000 Vp2 Ωsurges per

coupling mode

Conducted IEC/EN 310 i, o, signal wires 10 VAC AM 8 0% 150 Ω0.15 – 80 MHz yes A

disturbances 61000-4-6 ( 140 dBµV) 1 kH z

Power frequ enc y IEC/EN 311 -- 300 A/m 60 s in all 3 axis yes A

magnetic field 61000-4-8

1i = input, o = output, c = case

2A = normal operation, no deviation from specs.; B = temporary loss of function or deviation from specs possible

3RIA 12 covers or exceeds IEC 60571-1 and EN 50155:1995. Surge D corresponds to EN 50155:2001, waveform A; surge G corresponds

to EN 50155:2001, waveform B

4Only met with extended input voltage range of CS (for 48 V battery) and ES (for 110 V battery) model types. Such CS models are available

on customer's request. Standard DS models types (on 110 V battery) will shut down during the surge and recover automatically.

5Exceeds EN 50121-3-2:2015 table 6.3 and EN 50121-4:2016 table 2.4.

6Corresponds to EN 50121-3-2:2015 table 6.1 and exceeds EN 50121-4:2016 table 2.1.

7Corresponds to EN 50121-3-2:2015 table 6.2 and EN 50121-4:2016 table 2.2 (compliance with digital communication devices).

8Corresponds or exceeds EN 50121-3-2:2015 table 4.2 and EN 50121-4:2016 table 4.2.

9Covers or exceeds EN 50121-3-2:2015 table 4.3 and EN 50121-4:2016 table 4.3.

10 Corresponds to EN 50121-3-2:2015 table 4.1 and EN 50121-4:2016 table 4.1 (radio frequency common mode).

11 Corresponds to EN 50121-4:2016 table 2.3.

Electromagnetic Compatibility (EMC)

A metal oxide VDR together with the input fuse and an input

filter form an effective protection against high input transient

Electromagnetic Immunity

voltages, which typically occur in most installations. The

converters have been successfully tested to the following

specifications:

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PMM 8000 PLUS: Peak, conducted Vi+, QP + AV, 2009-11-20, 12:35 h

BK1601-9R, Ui=30 V, Uo=24 V Io= 6 A

dBµV

0.2 0.5 1 2 5 10 20 MHz

JM052a

EN 55022 A (qp)

EN 55022 A (av)

PMM 8000 PLUS: Peak, conducted Vi+, QP + AV, 2009-11-20, 13:00 h

DK1601-9ERB1, Ui=110 V, Uo=24 V Io= 6 A

dBµV

0.2 0.5 1 2 5 10 20 MHz

JM053

EN 55022 B (qp)

EN 55022 B (av)

30 50 100 200 500 1000 MHz

dBµV/m

EN 55011 A

TÜV-Divina, ESVS 30:R&S, BBA 9106/UHALP 9107:Schwarzb., QP, 2009-11-20

Testdistance 10 m, BK1601-9R, Ui=24 V, Uo=24 V Io= 6 A

JM050

<25 dbµV/m

Fig. 22a

Conducted emissions (peak/quasipeak and average) at the

phase input according to EN 55011/32, measured at Vi nom and

Io nom (BK1601-9R). The neutral line performs quite similar.

Fig. 22b

Conducted emissions (peak/quasipeak and average) at the

phase input according to EN 55011/32, measured at Vi nom

and Io nom (DK1601-9ERB1). The neutral line performs quite

similar.

Fig. 23a

Typical radiated emissions according to EN 55011/32,

antenna 10 m distance, measured at Vi nom and Io nom

(BK1601-9R)

Fig. 23b

Typical radiated emissions according to EN 55011/32,

antenna 10 m distance, measured at Vi nom and Io nom

(DK1601-9ERB1)

30 50 100 200 500 1000 MHz

dBµV/m

50 EN 55011 A

TÜV-Divina, ESVS 30:R&S, BBA 9106/UHALP 9107:Schwarzb., QP, 2009-11-20

Testdistance 10 m, DK1601-9ERB1, Ui=110 V, Uo=24 V Io= 6 A

JM051

<25 dbµV/m

Electromagnetic Emissions

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Immunity to Environment al Conditions

Table 10: Mechanical and climatic stress

Test Method Standard Test Conditions Status

Cab Damp heat IEC/EN 60068-2-78 Temperature: 40 ±2 °C Converter not

steady state MIL-STD-810D sect. 507.2 Relative humidity: 93 +2/-3 % operating

Duration: 56 days

Kb Salt mist, cyclic IEC/EN 60068-2-52 Concentration: 5 % (30 °C) for 2 h Converter not

(sodium chloride Storage: 40 °C, 93% rel. humidity operating

NaCl solution) Duration: 3 cycles of 22 h

Fc Vibration IEC/EN 60068-2-6 Acceleration amplitude: 0.35 mm (10 – 60 Hz) Converter

(sinusoidal) MIL-STD-810D sect. 514.3 5 g n = 49 m/s2 (60 – 2000 Hz) operating

Frequency (1 Oct / min): 10 – 2000 Hz

Test duration: 7.5 h (2.5 h each axis)

Fh Random vibration IEC/EN 60068-2-64 Acceleration spectral density: 0.05 gn2/Hz Converter

broad band Frequency band: 8 – 500 Hz operating

(digital control) Acceleration magnitude: 4.9 gn rms

Test duration: 1.5 h (0.5 h each axis)

Ea Shock IEC/EN 60068-2-27 Acceleration amplitude: 50 g n = 490 m/s2Converter

(half-sinusoidal) MIL-STD-810D sect. 516.3 Bump duration: 11 ms operating

Number of bumps: 18 (3 each direction)

-- Shock EN 50155:2007 sect. 12.2.11, Acceleration amplitude: 5.1 gnConverter

EN 61373 sect. 10, Bump duration: 30 ms operating

class B, body mounted1Number of bumps: 18 (3 in each direction)

-- Simulated long life EN 50155:2007 sect. 12.2.11, Acceleration spectral density: 0.02 gn2/Hz Converter

testing at EN 61373 sect. 8 and 9, Frequency band: 5 – 150 Hz operating

increased random class B, body mounted1Acceleration magnitude: 0.8 gn rms

vibration levels Test duration: 15 h (5 h in each axis)

1Body mounted = chassis of a railway coach

Table 11: Temperature specifications, values below are for an air pressure of 800 – 1200 hPa (800 – 1200 mbar)

Temperature -5 2-6 2-7 (option) -9 Unit

Characteristics Conditions min max min max min max min max

TAAmbient temperature Converter –25 50 –25 60 –25 71 –40 71 °C

TCCase temperature 1operating –25 85 1–25 90 1– 25 95 1–40 95 1

TSStorage temperature

Not operating

–40 85 –40 85 –40 85 –55 85

1Overtemperature lockout at TC > 95 °C

2Customer-specific models

Temperatures

Table 12: MTBF calculated according to MIL-HDBK 217F

Values at specified Model Ground benign Ground fixed Ground mobile Unit

case temperature 40 °C 40 °C 70 °C 50 °C

MTBF1LK2660-7 514 000 88 000 38 000 35 000 h

Device hours2AK – LK 500 000

1Calculated according to MIL-HDBK-217F-N2

2Statistic values, based on an average of 4300 working hours per year, over 3 years in general field use.

Reliability and Device Hours

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

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159 4.5

111 (3U)

168.5

4.5

19.7

9.5

29.9

6.5

51.5

30.3

20.3 12.1

10.3

7.04

3.27

7 TE 9 TE

Test sockets (+/–)

Option P (V

)

Option D (V

)

LED OK (green)

LED i (red)

LED I

(red)

Option D (V

)

25.9 11.8

Front plate Main face Back plate

Measuring point of

case temperature T

(171.0 .... 171.9)

50 42

Gravitational

axis

= Ø 4.1

= Ø 3.5

Mounting slots for chassis or wall mounting

Screw holes of the

frontplate

∅5 x 90°

∅2.8

0.2

27.38

09002e

Notes:

–d ≥ 15 mm, recommended minimum distance to

next part in order to ensure proper air circulation

at full output power.

– free air location: the converter should be mounted

with fins in a vertical position to achieve maximum

airflow through the heat sink.

Mechanical Data

Dimensions in mm. The converters are designed to be inserted into

a 19" rack, 160 mm long, according to IEC 60297-3.

Fig. 24

Aluminum case K02 with heat sink;

black finish (EP powder coated);

weight approx. 1.6 kg

European

Projection

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Note: Long case with option B2, elongated by 60 mm for 220 mm

rack depth, is available on request (no LEDs, no test sockets).

European

Projection

111 (3U)

17.3 133.4

168

101

47.2

158

M 4

Measuring point of

case temperature T

(171.0 ... 171.9)

3.27

7 TE 4 TE

09003b

38.5

11.8

Fig. 26

Option B1: Aluminum case K02 with small cooling plate; black finish (EP powder coated).

Suitable for mounting with access from the backside.

Total weight approx. 1.2 kg.

6.5

11.2

140

17.3 133.4 ±0.2 30

168

547.2

38.5

127 6.5

11.8

11027

Fig. 25

Option B: Aluminum case K02 with large cooling plate; black finish (EP powder coated).

Suitable for front mounting.

Total weight approx. 1.3 kg

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Safety and Installation Instructions

Connector Pin Allocation

The connector pin allocation table defines the electrical

potentials and the physical pin positions on the H15 or H15-S4

connector. The protective earth is connected by a leading pin

(no. 24), ensuring that it makes contact with the female

connector first.

Installation Instructions

Note: These converters have no power factor correction (PFC).

The LK4000/5000 models are intended to replace the LK1000 and

LK2000 converters in order to comply with IEC/EN 61000-3-2.

LK1000 is replaced by LK4003 with option K.

The converters are components, intended exclusively for

inclusion within other equipment by an industrial assembly

operation or by professional installers. Installation must strictly

follow the national safety regulations in compliance with the

enclosure, mounting, creepage, clearance, casualty, markings,

and segregation requirements of the end-use application.

Connection to the system shall be made via the female

connector H15 (standard) or H15S4; see Accessories. Other

installation methods may not meet the safety requirements.

Pin no. 24 ( ) is connected with the case. For safety reasons it

is essential to connect this pin reliably to protective earth.

The input pins 30/32 (Vi– or L ) are connected via a built-in

fuse, which is designed to protect in the case of a converter

failure. An additional external fuse, suitable for the application,

might be necessary in the wiring to the other input 26/28 (Vi+

or N ) or even to pins 30/32, particularly if:

• Local requirements demand an individual fuse in each

source line

Fig. 27

View of module's male connectors

Table 13: H15 and H15-S4 connector pin allocation

Pin Connector type H15-S4 Connector type H15

No. AK1000 (all), AK2000 BK – LK1301/1501/1601 BK – LK2000

BK – LK1001 except opt. K BK – LK1001 with opt. K

4Vo+ Pos. output 1 Vo2+ Pos. output 2 Vo+ Pos. output 1 Vo2+ Pos. output 2

6 Vo+ Vo2+

8Vo– Neg. output 1 Vo2– Neg. output 2 Vo– Neg. output 1 Vo2– Neg. output 2

10 Vo– Vo2–

12 S+ Pos. sense Vo1+ Pos. output 1 S + Pos. sense Vo1+ Pos output 1

14 S– Neg. sense Vo1– Neg. output 1 S– Neg. sense Vo1– Neg. output 1

16 R 1 Control of VoR 1 Control of Vo1 R 1 Control of VoR 1 Control of Vo1

18 i Inhibit i Inhibit i Inhibit i Inhibit

20 D 3 Save data D 3Safe data D 3Save data D 3Save data

V 3 ACFAIL

22 T 5Current sharing T 5Current sharing T 5Current sharing T 5Current sharing

242Protective earth Protective earth Protective earth Protective earth

26 Vi+ N 4Pos. input Vi + Pos. input Vi+ N 4Pos. input Vi+ N 4Pos. input

28 Neutral line 4Vi+ N 4Neutral line 4Vi+ N 4Neutral line 4

30 Vi– L 4Neg. input Vi– Neg. input Vi– L 4Neg. input Vi– L 4Neg. input 4

32 Phase line 4Vi– L 4Phase line 4Vi– L 4Phase line 4

1Not connected, if option P is fitted.

2Leading pin (pre-connecting)

3Option D excludes option V and vice versa. Pin 20 is not connected, unless option D or V is fitted.

4LK models

5Only connected, if option T is fitted.

4/6

30/32

Connector type H15

Connector type H15S4

Fixtures for connector

retention clips HZZ01209G

(see Accessories)

Fixtures for connector

retention clips HZZ01209G

(see Accessories)

10010b

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

MELCHER

The Power Partners.

BCD20002-G Rev AF1, 17-Apr-2018 Page 21 of 31

• Phase and neutral of the AC mains are not defined or cannot

be assigned to the corresponding terminals.

• Neutral and earth impedance is high or undefined

Notes:

– If the inhibit function is not used, pin no. 18 (i) should be

connected with pin no. 14 to enable the output(s).

– Do not open the converters, or warranty will be invalidated.

– Due to high current values, the converters provide two internally

parallel contacts for certain paths (pins 4/6, 8/10, 26/28 and 30/

32). It is recommended to connect both female connector pins of

each path in order to keep the voltage drop low and avoid

excessive connector currents.

– If the second output of double-output models is not used,

connect it parallel with the main output.

Make sure that there is sufficient airflow available for

convection cooling and verify it by measuring the case

temperature TC, when the converter is installed and operated in

the end-use application; see Thermal Considerations.

Ensure that a converter failure (e.g, an internal short-circuit)

does not result in a hazardous condition.

Standards and Approvals

The converters are safety-approved according to the latest

edition of IEC/EN 60950-1 and UL/CSA 60950-1.

The converters correspond to Class I equipment and have

been evaluated for:

• Building-in

• Basic insulation between input and case based on 250 VAC,

and double or reinforced insulation between input and

output(s)

• Functional insulation between outputs

• Overvoltage category II

• Pollution degree 2 environment

• Max. altitude: 2000 m

• The converters fulfill the requirements of a fire enclosure.

The converters are subject to manufacturing surveillance

in accordance with the above mentioned standards and ISO

9001:2000. A CB-scheme is available.

Railway Applications and Fire Protection

The converters have been designed by observing the railway

standards EN 50155, EN 50121-3-2, and EN 50121-4. All

boards are coated with a protective lacquer.

The converters with version V10 8 (or later, but not models with

H15S4 connector: 5 V output without option K) comply with

NF-F16 (I2/F1). They also comply with EN 45545-1, EN 45545-2

(2013), if installed in a technical compartment or cabinet.

Protection Degree and Cleaning Liquids

Condition: Female connector fitted to the converter.

• IP 30: All models except those with option P, and except

those with option D or V including a potentiometer.

• IP 20: All models fitted with option P, or with option D or V

with potentiometer.

In order to avoid damage, any penetration of cleaning fluids

has to be prevented, since the power supplies are not

hermetically sealed.

Isolation and Protective Earth

The electric strength test is performed in the factory as routine

test in accordance with EN 50514 and IEC/EN 60950. The

company will not honor any warranty claims resulting from

incorrectly executed electric strength field tests. The resistance

between earth connection and case (<0.1 Ω) is tested as well.

Leakage Currents

Leakage currents flow due to internal leakage capacitances and

Y-capacitors. The current values are proportional to the supply

voltage and are specified in the table below.

LK Models Operated at Greater than 63 Hz

Above 63 Hz, the earth leakage current may exceed 3.5 mA,

the maximum value allowed in IEC 60950. Frequencies ≥350

Hz only permitted with Vi ≤200 VAC.

The built-in Y-caps are approved for ≤100 Hz. Safety approvals

and CB scheme cover only 50 – 60 Hz.

Table 15: Isolation

Characteristic Input to case Output(s) to Output 1 to Unit

and output(s) case output 2

Electric Factory test >1 s 2.8 1 1.4 0.15 kVDC

strength AC test voltage equivalent 2.0 11.0 0.1 kVAC

test to factory test

Insulation resistance at 500 VDC >300 >300 >100 2 MΩ

Creepage distances ≥3.2 3 -- -- mm

1According to EN 50514 and IEC/EN 60950, subassemblies connecting input to output are pre-tested with 5.6 kVDC or 4 kVAC.

2Tested at 150 VDC

3Input to outputs: 6.4 mm

Table 14: Earth leakage currents for LK models

Characteristic Class I Unit

Max. leakage Permissible accord. to IEC/EN 60950 3.5 mA

current Typ. value at 264 V, 50 Hz 1.43

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

MELCHER

The Power Partners.

BCD20002-G Rev AF1, 17-Apr-2018 Page 22 of 31

AC-DC

front

end

DC-DC

con-

verter

Mains Battery SELV

Earth connection

–

10044a

≤150 VAC or VDC for AK, BK

≤250 VAC or VDC for CK, DK, EK, FK, LK

Fuse

≤150 VAC or VDC for AK, BK

≤250 VAC or VDC for CK, DK, EK, FK, LK

Safety of Operator-Accessible Output Circuits

If the output circuit of a DC-DC converter is operator-

accessible, it shall be an SEL V circuit according to the st andard

IEC 60950-1.

The following table shows some possible installation

configurations, compliance with which causes the output circuit

of the converter to be an SELV circuit according to IEC 60950-

1 up to a configured output voltage (sum of nominal volt ages if

in series or +/– configuration) of 36 V.

However, it is the sole responsibility of the installer to assure

the compliance with the rapplicable safety regulations.

Table 16: Safety concept leading to an SELV output circuit

Conditions Front end DC-DC converter Result

Nominal Minimum required grade Nominal DC Minimum required Types Measures to achieve the Safety status

supply of insulation, to be pro- output voltage safety status of the specified safety status of of the DC-DC

voltage vided by the AC-DC front from the front end front end output the output circuit converter

end, including mains circuit output circuit

supplied battery charger

Mains Functional (i.e. there is ≤100 V (The Primary circuit AK Double or reinforced SELV circuit

≤150 V AC no need for electrical nominal voltage BK insulation, based on

insulation between the between any input the mains voltage and 2

mains supply voltage pin and earth can (provided by the DC-DC

and the DC-DC converter be up to 150 V AC converter) and earthed

input voltage) or DC) case 3

Mains ≤400 V (The CK

≤250 V AC nominal voltage D K

between any input EK

pin and earth can FK

be up to 250 V AC

or 400 V DC)

Basic ≤400 V Unearthed A K Supplementary insulation,

hazardous voltage BK based on 250 V AC and

secondary circuit CK double or reinforced

DK insulation 2 (provided by

EK DC-DC converter) and

FK earthed case 3.

Earthed Double or reinforced

hazardous voltage insulation 2 (provided by

secondary circuit the DC-DC converter)

earthed case 3

Double or reinforced ≤60 V SELV circuit Functional insulation

(provided by the DC-DC

converter) 4

≤120 V TNV-3 circuit Basic insulation (provided

by the DC-DC converter) 4

1The front end output voltage should match the specified input voltage range of the DC-DC converter.

2Based on the maximum nominal output voltage from the front end.

3The earth connection has to be provided by the installer according to the relevant safety standard, e.g. IEC/EN 60950-1.

4Earthing of the case is recommended, but not mandatory.

Fig. 28

Schematic safety concept.

Use earth connections as per the table below.

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

MELCHER

The Power Partners.

BCD20002-G Rev AF1, 17-Apr-2018 Page 23 of 31

Table 17: Safety concept leading to an SELV output circuit

Conditions AC-DC converter Installation Result

Nominal voltage Grade of insulation Measures to achieve the resulting Safety status of the AC-DC

between input and output safety status of the output circuit converter output circuit

provided by the AC-DC converter

Mains Double or reinforced Earthed case1 and installation SELV circuit

≤250 VAC according to the applicable standards

1 The earth connection has to be provided by the installer according to the relevant safety standards, e.g. IEC/EN 60950.

If the output circuit of an AC-DC converter is operator-

accessible, it shall be an SELV circuit according to standard

IEC 60950-1.

The following table shows some possible installation

configurations, compliance with which causes the output circuit

of LK models to be SELV according to IEC 60950-1 up to a

configured output voltage (sum of nominal voltages if in series

or +/– configuration) of 36 V.

If the LK converter is used as DC-DC converter, refer to the

previous section.

Fig. 29

Schematic safety concept. Use earth connection as per table

17. Use fuses if required by the application; see also

Installation Instructions.

Description of Options

Table 18: Survey of options

Option Function of option Characteristic

-7 Extended operational ambient temperature range TA = –25 to 71 °C

E Electronic inrush current limitation circuitry Active inrush current limitation

P2Potentiometer for fine adjustment of output voltage Adjustment range +10/–6 0 % of Vo nom, excludes R-input

D1Input and/or output undervoltage monitoring circuitry Safe data signal output (D0 – DD)

V1Input and/or output undervoltage monitoring circuitry A CFAIL signal according to VME specifications (V0, V2, V3)

T Current sharing Interconnect T-pins for parallel connection (max 5 converters)

K Standard H15 Connector H15 standard connector instead H15-S4 for models with Vo = 5.1 V)

B, B1, B2 Cooling plate (160 or 220 mm long) Replaces the standard heat sink, allowing direct chassis-mounting

non-G RoHS-compliant for 5 substances Tin-lead solder

1Option D excludes option V and vice versa; option V only for 5.1 V outputs.

2Option P is not available for battery charger models.

-7 Temperature Range

Option -7 designates converters with an operational ambient

temperature range of –25 to 71 °C. Not for new designs.

E Inrush Current Limitation

CK / D K/ EK/LK models may be supplemented by an electronic

circuit (option E, replacing the standard built-in NTC resistor)

AC-DC

con-

verter

Mains SEL

Earth

connection

–

10021a

Fuse

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

MELCHER

The Power Partners.

BCD20002-G Rev AF1, 17-Apr-2018 Page 24 of 31

to achieve an enhanced inrush current limiting function (not

available with AK / BK/ FK types). Option E is mandatory for all

CK /DK/EK /LK models with option -9.

Ii [A]

–5

–10

–15

020 40 60 80

t [ms]

tinr

Capacitor Ci

fully charged

Normal operation

(FET fully conducting)

10065a

Fig. 30

Block diagram of option E

Current limiting resistance Rv = Rs + RSt = 15

Ω

Fig. 32

Inrush current for LK models with option E (AC supply)

Vi = 230 VAC, fi = 50 Hz, Po = Po nom

P Potentiometer

A potentiometer provides an output voltage adjustment range

of +10/– 60 % of Vo nom. It is accessible through a hole in the

front cover . Option P is not available for battery charger models

and is not recommended for converters connected in parallel.

Option P excludes the R-function. With double-output models,

both outputs are influenced by the potentiometer setting

(doubling the voltage, if the outputs are in series).

Note: If the output voltages are increased above Vo nom via R input

control, option P setting, remote sensing, or option T, the output

current(s) should be reduced, so that Po nom is not exceeded.

The figure below shows two consecutive peaks of the inrush

current, the first one is caused by Vi/Rv and the second one by

the rising current across the FET. The shape of the curve

depends on model, but the tables below show the higher of

both peaks.

CK models fitted with option E and option D6 (input voltage

Table 19a: Inrush current at Vi nom (DC supply) and Io nom

Characteristics CK DK E K LK Unit

Vi nom Input voltage 60 110 220 310 V

Iinr p Peak inrush current 6.5 7.4 14.6 21 A

tinr Inrush current duration 25 14 16 12 ms

Table 19b: Inrush current at Vi max (DC supply) and Io nom

Characteristics CK DK E K LK Unit

Vi nom Input voltage 140 220 385 372 V

Iinr p Peak inrush current 9 14.5 25.7 24.8 A

tinr Inrush current duration 30 14 12 12 ms

Iinr [A]

Vi/Rv

tinr

t [ms]

Normal operation

(FET fully conducting)

Ii = Pi/Vi

Capacitor Ci

fully charged

11039a

Fig. 30

Inrush current with option E (DC supply)

2 different wafe shapes depending on model

monitor) meet the standard ETS 300132-2 for 48 VDC

supplies. Option D6 is necessary to disable the converter at

low input voltage, such avoiding an excessive input current.

Connect output D (pin 20) with inhibit (pin 18).

Option D6 should be adjusted with the potentiometer to a

threshold of 36 – 40.5 V for 48 V batteries and to 44 – 50 V for

60 V batteries. Refer also to the description of option D.

Note: Subsequent switch-on cycles at start-up are limited to max.

10 cycles during the first 20 seconds (cold converter) and then to

max. 1 cycle every 8 s.

LK models powered by 230 VAC/ 50 Hz exhibit an inrush

current as per the fig. below, when switched on at the peak of

Vi. In this case, the inrush current Iinr p is 21.7 A and it s duration

tinr is 5 ms. This is the worst case.

If the LK converter is switched on in a different moment, Iinr p is

much lower, but tinr rises up to 10 ms.

Input Filter

Control

Converter

FET

10017b

LK models

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

MELCHER

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BCD20002-G Rev AF1, 17-Apr-2018 Page 25 of 31

Fig. 35

Parallel connection of double-output models with the outputs

connected in series, using option T.

The signal at the T pins is referenced to Vo1–.

Vo+/Vo1+

S–/Vo1–

Input

11006a

Self-conducting

junction FET

Fig. 34

Parallel connection of single-output models using option T

with the sense lines connected at the load

T Current Sharing

This option ensures that the output currents are approximately

shared between all parallel-connected converters, hence

increasing system reliability. To use this facility, simply

interconnect the T pins of all converters and make sure that the

reference for the T signal, pin 14 (S– or Vo1–), are also

connected together. The load lines should have equal length

and cross section to ensure equal voltage drops.

Not more than 5 converters should be connected in parallel. The

R pins should be left open-circuit. If not, the output volt ages must

be individually adjusted prior to paralleling within 1 to 2% or the R

pins should be connected together.

Note: Parallel connection of converters with option P is not recom-

mended.

Fig.33

Example of poor wiring for parallel connection (unequal

length of load lines)

Vo+

Vo–

Vo+

Vo–

Load

Vo+

Vo–

11003a

Load

S+

Vo+

Vo–

S–

S+

Vo+

Vo–

S–

Max. 5 converters in parallel connection

1 Lead lines should have equal length and cross

section, and should run in the same cable loom.

2 Diodes recommended in redundant operation only

11036b

Converter

Load

Max. 5 converters in parallel connection

+–

Power bus

Converter

Vo2–

Vo2+

Vo1–

Vo1+

Converter

Vo2–

Vo2+

Vo1–

Vo1+

11037b

D Undervoltage Monitor

The input and/or output undervoltage monitor operates in-

dependently of the built-in input undervoltage lockout circuit. A

logic "low" signal (output with self-conducting JFET) or "high"

signal (NPN open-collector output) is generated at the D output

(pin 20), when one of the monitored voltages drops below the

preselected threshold level Vt. This signal is referenced to S–/

Vo1–. The D output recovers, when the monitored voltages

exceed Vt + V

h. The threshold levels Vti and Vto are either

adjusted by a potentiometer, accessible through a hole in the

front cover, or adjusted in the factory to a fixed value specified

by the customer.

Option D exists in various versions D0 – DD, as shown in table

21. D0 and D9 are adjusted according to customer’s request

and receive a customer-specific model number.

JFET output (D0 – D4):

Pin D is internally connected via the drain-source path of a

JFET (self-conducting type) to the negative potential of output

Fig. 36

Option D0 – D4: JFET output, ID ≤ 2.5 mA

K Series Data Sheet

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BCD20002-G Rev AF1, 17-Apr-2018 Page 26 of 31

Vo+/Vo1+

S–/Vo1–

Input

11007a

NPN open

collector

1. VD ≤ 0.4 V (logic low) corresponds to a monitored voltage

level (Vi and/or Vo1) <Vt. The current ID through the JFET

should not exceed 2.5 mA. The JFET is protected by a 0.5 W

Zener diode of 8.2 V against external overvoltages.

NPN output (D5 – DD):

Pin D is internally connected via the collector-emitter path of a

Table 22: NPN output (D5 – DD)

Vb, Vo1 status D output, VD

Vb or Vo1 < Vthigh, H, ID ≤ 25 µA at VD = 40 V

Vb and Vo1 > Vt + Vhlow, L, VD ≤ 0.4 V at ID = 20 mA

Table 21: JFET output (D0 -- D4)

Vb, Vo1 status D output, VD

Vb or Vo1 < Vtlow, L, VD ≤ 0.4 V at ID = 2.5 mA

Vb and Vo1 > Vt + Vhhigh, H, ID ≤ 25 µA at VD = 5.25 V

Fig. 37

Option D5 – DD: NPN output, Vo ≤40, ID ≤ 2.5 mA

NPN transistor to the negative potential of output 1. VD < 0.4 V

(logic low) corresponds to a monitored voltage level (Vi and/or

Vo1) > Vt + Vh. The current ID through the open collector should

not exceed 20 mA. The NPN output is not protected against

external overvoltages. VD should not exceed 40 V.

Threshold tolerances and hysteresis:

If Vi is monitored, the internal input voltage after the input filter

is measured. Consequently this voltage differs from the volt age

at the connector pins by the voltage drop ∆Vti across the input

filter. The threshold levels of the D0 and D9 options are factory

adjusted at nominal output current Io nom and TA = 25 °C. The

value of ∆Vti depends upon input voltage range (CK, DK, ..),

threshold level Vt, temperature, and input current. The input

current is a function of the input voltage and the output power.

Fig. 38

Definition of Vti, ∆Vt i and ∆Vhi (JFET output)

∆Vti Vhi

VD low

VD high

= P

o nom

= 0

Vti

= P

o nom

11021a

Table 20: Undervoltage monitoring functions

Output type Monitoring Minimum adjustment range Typ. hysteresis Vho [% of Vt] Number of

JFET NPN ViVo or Vo1 of threshold level Vtfor Vt min – Vt max potentio-

Vti Vto Vhi Vho meters

D1 D5 no yes -- 3.5 V – Vo BR 1-- 2.5 – 0.6 V 1

D2 D6 yes no Vi min – Vi max 1-- 3.4 – 0.4 V -- 1

D3 D7 yes yes Vi min – Vi max 1(0.95 – 0.985 Vo) 2 3.4 – 0.4 V "0" 1

D4 D8 no yes -- (0.95 – 0.985 Vo) 2 -- "0" --

D05D95no yes -- 3.5 V – Vo BR V 3 -- 2.5 – 0.6 V --

yes no Vi min – Vi max 3 4 -- 3.4 – 0.4 V --

yes yes Vi min – Vi max 3 4 3.5 V – Vo BR V3 4 3.4 – 0.4 V 2.5 – 0.6 V

yes yes Vi min – Vi max 3 4 (0.95 – 0.985 Vo) 2 3.4 – 0.4 V " 0 "

-- DD yes yes Vi min – Vi max 13.5 V – Vo BR V 1 3.4 – 0.4 V 2.5 – 0.6 V 2

1Threshold level adjustable by potentiometer; see Electrical Output Data for Vo BR.

2Fixed value. Tracking if Vo/Vo1 is adjusted via R-input, option P, or sense lines.

3The threshold level permanently adjusted according to customer specification ±2% at 2 5 °C. Any value within the specified range is

basically possible, but causes a special type designation in addition to the standard option designations (D0/D9). See Electrical Output

Data for Vo BR.

4Adjustment at Io nom.

5Customer-specific part number

K Series Data Sheet

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BCD20002-G Rev AF1, 17-Apr-2018 Page 27 of 31

Fig. 39

Relationship between Vi, Vo, VD, Vo/Vo nom versus time

Table 23: D-output logic signals

Version of D Vi < Vt or Vo < VtVi > Vt + Vh or Vo > VtConfiguration

D1, D2, D3, D4, D0 low high JFET

D5, D6, D7, D8, D9, DD high low N PN

0.95

[VDC]

low min4

high min

Input voltage failure Switch-on cycle Input voltage sag Switch-on cycle and subsequent

input voltage failure

D high

D low

JFET

NPN

o1 nom

D high

D low

low min4

D high

D low

JFET

NPN

D high

D low

low min4

Output voltage failure

D high

D low

D high

D low

33 33

o1 nom

Input voltage monitoring

Output voltage monitoring

11008a

1 Hold-up time see Electrical Input Data

2 With output voltage monitoring, hold-up time th = 0

3 The signal remains high, if the D output is connected

to an external source

tlo

w min = 100 – 170 ms, typ. 130 ms

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

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BCD20002-G Rev AF1, 17-Apr-2018 Page 28 of 31

V ACFAIL signal (VME)

Available for units with Vo nom = 5.1 V only.

This option defines an undervoltage monitoring circuit for the

input or for the input and main output voltage ( 5.1 V) similar to

option D and generates an ACFAIL signal (V signal), which

conforms to the VME standard.

The low state level of the ACFAIL signal is specified at a sink

current of IV ≤ 48 mA to VV ≤ 0.6 V (open-collector output of an

NPN transistor). The pull-up resistor feeding the open-collector

output should be placed on the VME back plane.

After the ACFAIL signal has gone low, the VME standard

requires a hold-up time th of at least 4 ms, before the 5.1 V

output drops to 4.875 V, when the output is fully loaded. This

hold-up time th is provided by the internal input capacitance.

Consequently the working input voltage and the threshold level

Vti should be adequately above Vi min of the converter, so that

enough energy is remaining in the input capacitance. If Vi is

below the required level, an external hold-up capacitor (Ci ext)

should be added; refer to the formulas below:

2 • Po • (th + 0.3 ms) • 100

Vti = –––––––––––––––––––––––– + Vi min2

Ci min • η

2 • Po • (th + 0.3 ms) • 100

Ci ext = –––––––––––––––––––––– – Ci min

η • (Vti 2 – Vi min2)

where as:

Ci min = internal input capacitance [mF]; see table 2

Ci ext = external input capacitance [mF]

Po= output power [W]

η= efficiency [%]

th= hold-up time [ms]

Vi min = minimum input voltage [V] 1

Vti = threshold level [V]

1Vi min see Electrical Input Data. For output voltages Vo > Vo nom,

Vi min increases proportionally to Vo/Vo nom.

Note: Option V2 and V3 can be adjusted by the potentiometer to a

threshold level between Vi min and Vi max. A decoupling diode should

be connected in series with the input of AK – FK converters to

avoid the input capacitance discharging through other loads

connected to the same source voltage.

Option V operates independently of the built-in input under-

voltage lockout circuit. A logic "low" signal is generated at pin

20, as soon as one of the monitored voltages drops below the

preselected threshold level Vt. The return for this signal is

S–. The V output recovers, when the monitored voltages

exceed Vt + Vh. The threshold level Vti is either adjustable by a

potentiometer, accessible through a hole in the front cover, or

adjusted in the factory to a determined customer-specific

value. Refer to table 26.

V output (V0, V2, V3):

Pin V is internally connected to the open collector of an NPN

transistor . The emitter is connected to S–. VV ≤ 0.6 V (logic low)

corresponds to a monitored voltage level (Vi and/or Vo) <Vt. IV

should not exceed 50 mA. The V output is not protected against

external overvoltages: VV should not exceed 60 V.

Threshold tolerances and hysteresis:

If Vi is monitored, the internal input voltage is measured after

the input filter. Consequently this voltage differs from the

Table 26: NPN-output (V0, V2, V3)

Vi, Vo st atus V output, VV

Vi or Vo1 < Vtlow, L, VV ≤ 0.6 V at IV = 50 mA

Vi and Vo1 > Vt + V hhigh, H, IV ≤ 25 µA at VV = 5.1 V

voltage at the connector pins by the voltage drop ∆Vti across

the input filter. The threshold level of option V0 is adjusted in

the factury at Io nom and TA = 25 °C. The value of ∆Vti depends

upon the input voltage range (AK, BK, etc.), threshold level Vt,

temperature, and input current. The input current is a function

of input voltage and output power.

Table 25: Undervoltage monitor functions

Option Monitoring Minimum adjustment range Typical hysteresis Vh [% of Vt]

of threshold level Vtfor Vt min – Vt max

ViVo1 Vti Vto Vhi Vho

V2 yes no Vi min – Vi max 1 -- 3.4 - 0.4 --

V3 yes yes Vi min – Vi max 1 0.95 - 0.985 Vo1 2 3.4 - 0.4 "0"

V0 yes no Vi min – Vi max 3 4 -- 3.4 - 0.4 --

yes yes Vi min – Vi max 3 4 0.95 - 0.985 Vo1 2 3.4 - 0.4 "0"

1Threshold level adjustable by potentiometer. 2 Fixed value between 95% and 98.5% of Vo1 (tracking). 3 Adjusted at Io nom.

4Fixed value, resistor-adjusted (±2% at 25°C) accord. to customer's specification; individual type number is determined by the company.

Table 24: Option V: Factory potentiometer setting of Vti with resulting hold-up time

Model AK BK FK CK DK EK LK Unit

Vt i 9.5 19.5 39 39 61 97 120 VDC

th0.1 0.1 3.4 1.1 1.1 2.7 4.2 ms

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

MELCHER

The Power Partners.

BCD20002-G Rev AF1, 17-Apr-2018 Page 29 of 31

5.1 V

4.875 V

Vi [VDC]

Vti + Vhi

Vti

Input voltage failure Switch-on cycle Input voltage sag Switch-on cycle and subsequent

input voltage failure

VV high

VV low

VV high

VV low

Vti

Output voltage failure

VV high

VV low

Vti + Vhi

tlow min 2 tlow min 2

tlow min 2

VV high

VV low

tlow min 2

th 1

2.0 V

th 1

tlow min 2

5.1 V

4.875 V

2.0 V

Input voltage monitoring

Output voltage monitoring

11010a

∆V

V low

V high

= P

o nom

= 0

= P

o nom

11023a

Fig. 40

Output configuration of options V0, V2 and V3 Fig. 41

Definition of Vti,

∆

Vti and Vhi

1VME request: minimum 4 ms

2tlow min = 40 – 200 ms, typ 80 ms

3VV level not defined at Vo < 2.0 V

4The V signal drops simultaneously with Vo, if the pull-up

resistor RP is connected to Vo+; the V signal remains

high if RP is connected to an external source.

Fig. 42

Relationship between Vb, Vo, VD, Vo/Vo nom versus time

Vo+

S–

Input

11009a

NPN open

collector

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

MELCHER

The Power Partners.

BCD20002-G Rev AF1, 17-Apr-2018 Page 30 of 31

K Standard H15 Connector

Option K is available only for 5.1 V output models in order to

avoid the connector with high current contacts. Efficiency is

approx. 1.5% worse.

B, B1, B2 Cooling Plate

Where a cooling surface is available, we recommend the use

of a cooling plate instead of the standard heat sink. The

mounting system should ensure that the maximum case

temperature TC max is not exceeded. The cooling capacity is

calculated by (η see Model Selection):

(100% –

η)

PLoss = –––––––––– • Vo • Io

For the dimensions of the cooling plates, see Mechanical Data.

Option B2 is for customer-specific models with elongated case

(for 220 mm DIN-rack depth).

G RoHS

RoHS-compliant for all six substances.

Fig. 47

Cage clamp adapter HZZ00144-G

Accessories

A variety of electrical and mechanical accessories are

available including:

– Front panels for 19" DIN-rack: Schroff or Intermas,

12 TE /3U; see fig. 43.

– Mating H15 connectors with screw, solder, faston, or press-

fit terminals, code key system and coding wedges

HZZ00202-G; see fig. 44.

– Pair of connector retention clips HZZ01209-G; see fig. 45

– Connector retention brackets HZZ01216-G; see fig. 46

– Cage clamp adapter HZZ00144-G; see fig. 47

Fig. 43

Different front panels

Fig. 44

Different mating connectors

Fig. 45

Connector retention clips to fasten the H15 connector to

the rear plate; see fig. 24. HZZ01209-G consists of 2 clips.

Fig. 46

Connector retention brackets HZZ01216-G (CRB-HKMS)

20 to 30 Ncm

K Series Data Sheet

150 Watt DC-DC and AC-DC Converters

MELCHER

The Power Partners.

BCD20002-G Rev AF1, 17-Apr-2018 Page 31 of 31

Fig. 49

Chassis- or wall-mounting plate

HZZ01213-G (Mounting plate K02)

Fig. 50

DIN-rail mounting assembly HZZ00615-G (DMB-K/S)

– Different cable hoods for H15 connectors (fig. 48):

- HZZ00141-G, screw version

- HZZ00142-G, use with retention brackets HZZ01218-G

- HZZ00143-G, metallic version providing fire protection

– Chassis or wall-mounting plate K02 (HZZ01213-G) for

models with option B1. Mating connector (HZZ00107-G)

with screw terminals; see fig. 49

– DIN-rail mounting assembly HZZ0615-G (DMB-K/S); see

fig. 50

– Additional external input and output filters

– Different battery sensors S-KSMH... for using the converter

as a battery charger. Different cell characteristics can be

selected; see fig. 51, table 27, and Battery Charging/

Temperature Sensors.

For additional accessory product information, see the

accessory data sheets listed with each product series or

individual model at our web site.

Fig. 48

Different cable hoods

56 (2.2")L

L = 2 m (standard length)

other cable lengths on request

adhesive tape

26 (1.02")

9.8 (0.4")

09125a

European

Projection

Fig. 51

Battery temperature sensor

NUCLEAR AND MEDICAL APPLICATIONS - These products are not designed or intended for use as critical components in life support systems,

equipment used in hazardous environments, or nuclear control systems.

TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the

date manufactured. Specifications are subject to change without notice.

Table 27: Battery temperature sensors

Battery Sensor Cell Cell temp. Cable

voltage type voltage

coefficient

length

nom. [V] [V] [mV/K] [m]

12 S-KSMH12-2.27-30-2 2.27 –3.0 2

12 S-KSMH12-2.27-35-2 2.27 –3.5 2

24 S-KSMH24-2.27-30-2 2.27 –3.0 2

24 S-KSMH24-2.27-35-2 2.27 –3.5 2

24 S-KSMH24-2.31-35-0 2.31 –3.5 4.5

24 S-KSMH24-2.31-35-2 2.31 –3.5 2

24 S-KSMH24-2.35-35-2 2.35 –3.5 2

48 S-KSMH48-2.27-30-2 2.27 –3.0 2

48 S-KSMH48-2-27-35-2 2.27 –3.5 2

Note: Other temperature coefficients and cable lengths are

available on request.