M-Family DC-DC Converters <100 W Rugged Environment
7 - 2 Edition 2/96 - © Melcher AG
MELCHER
The Power Partners.
7.1
50 W DC-DC (AC-DC) Converters M-Family
Class I Equipment
Single output: series AM...LM 1000
Dual output: series AM...LM 2000
Triple output: series AM...LM 3000
Class II Equipment (double insulation)
Single output: series CMZ/DMZ/LMZ 1000
Dual output: series CMZ/DMZ/LMZ 2000
Triple output: series CMZ/DMZ/LMZ 3000
• Extremely wide input voltage range suitable for
battery (and AC) operation
• Efficient input filter and built-in surge and transient
suppression circuitry
•4 kV
rms input to output electric strength test
• Outputs individually isolated and controlled
• Outputs fully protected against overload
Table of Contents...........................................Page
Description ..................................................................7 - 2
Type Survey ................................................................ 7 - 3
Safety and Installation Instructions ............................. 7 - 4
Functional Description................................................. 7 - 6
Electrical Input Data ....................................................7 - 7
Electrical Output Data .................................................7 - 9
EMC and Immunity to Input Transients.....................7 - 13
Supplementary Data .................................................7 - 15
Description of Options...............................................7 - 16
Immunity to Environmental Conditions......................7 - 22
Mechanical Data .......................................................7 - 24
Type Key and Product Mar king .................................7 - 25
Description
The M-family of DC-DC (AC-DC) converters represents a
broad and flexible range of power supplies for use in ad-
vanced industrial electronic systems. Features include high
efficiency, reliability, low output voltage noise and excellent
dynamic response to load/line changes due to individual
regulation of each output.
The converter inputs are protected against surges and tran-
sients occuring at the source lines. An input over- and
undervoltage cut-out circuitry disables the outputs if the in-
put voltage is outside the specified range. Certain types in-
clude an inrush current limitation preventing circuit break-
ers and fuses from being damaged at switch-on.
All outputs are open- and short-circuit proof and are pro-
tected against overvoltages by means of built-in suppres-
sor diodes. The outputs can be inhibited by a logic signal
applied to the connector pin 2 (i). If the inhibit function is not
used pin 2 should be connected with pin 23 to enable the
outputs.
LED indicators display the status of the converter and allow
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 modules are designed
and built according to the international safety standard
IEC 950 and have been approved by the safety agencies
LGA (Germany) and UL (USA). The UL Mark for Canada
has been officially recognized be regulator y authorities in
provinces across Canada.
The case design allows operation at nominal load up to
71°C in a free air ambient temperature. If forced cooling is
provided, the ambient temperature may exceed 71 °C but
the case temperature should remain below 95 °C under all
conditions.
A temperature sensor generates an inhibit signal which
disables the outputs if the case temperature
T
C 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 in-
dividual applications.
The modules may either be plugged into 19 inch rack sys-
tems according to DIN 41494, or be chassis mounted.
Case: aluminium, black finish, self cooling.
Dimensions: 38.7 × 111.2 × 168.5 mm. Weight: 770 g.
Safety according to IEC 950
LGA
C
Rugged Environment DC-DC Converters <100 W M-Family
Edition 2/96 - © Melcher AG 7 - 3
MELCHER
The Power Partners.
7.1
Notes: EM types with an input voltage range of 67...385 V DC are available upon request
Remar ks: LM types may be operated in AC mode within a frequency range of 47...440 Hz and LMZ types within a fre-
quency range of 47...65 Hz.
Type Survey
Options see "Descriptions of Options"
General note
The type survey tables provide an overview of the basic input and output configurations. More than 500 different types
have been manufactured providing different output configurations and customiz ed specialities. Please consult Melcher's
field sales engineers for specific requirements . The best technical solution will carefully be considered and a detailed pro-
posal submitted.
Table 1a: Class I equipment
Output 1 Output 2 Output 3 Input Voltage Range and Efficiency 1 Option
U
o nom
I
o nom
U
o nom
I
o nom
U
o nom
I
o nom
U
i min...
U
i max
η
min
U
i min...
U
i max
η
min
U
i min...
U
i max
η
min
V DC A V DC A V DC A 8...35 V DC %14...70 V DC %20...100 V DC %
5.1 8.0 AM 1001-7R 72 BM 1001-7R 74 FM 1001-7R 74 –9
12.0 4.0 AM 1301-7R 79 BM 1301-7R 80 FM 1301-7R 80 P
15.0 3.4 AM 1501-7R 79 BM 1501-7R 81 FM 1501-7R 81 D0...D9
24.0 2.0 AM 1601-7R 81 BM 1601-7R 83 FM 1601-7R 82 V0,V2,V3
48.0 1.0 AM 1901-7R 81 BM 1901-7R 83 FM 1901-7R 83 A
12.0 2.0 12.0 2.0 AM 2320-7 77 BM 2320-7 79 FM 2320-7 80 H
15.0 1.7 15.0 1.7 AM 2540-7 78 BM 2540-7 80 FM 2540-7 79 F
5.1 5.0 12.0 0.7 12.0 0.7 AM 3020-7 75 BM 3020-7 76 FM 3020-7 76 U
5.1 5.0 15.0 0.6 15.0 0.6 AM 3040-7 75 BM 3040-7 76 FM 3040-7 76
Table 1b: Class I equipment
Output 1 Output 2 Output 3 Input Voltage Range and Efficienc y 1 Option
U
o nom
I
o nom
U
o nom
I
o nom
U
o nom
I
o nom
U
i min...
U
i max
η
min
U
i min...
U
i max
η
min
U
i min...
U
i max
η
min
V DC A V DC A V DC A 28…140 V DC %44…220 V DC %88...372 V DC %
(85...264 V A C)
5.1 8.0 CM 1001-7R 74 DM 1001-7R 74 LM 1001-7R 73 –9
12.0 4.0 CM 1301-7R 80 DM 1301-7R 81 LM 1301-7R 79 E
15.0 3.4 CM 1501-7R 82 DM 1501-7R 82 LM 1501-7R 78 P
24.0 2.0 CM 1601-7R 82 DM 1601-7R 83 LM 1601-7R 81 D0...D9
48.0 1.0 CM 1901-7R 82 DM 1901-7R 83 LM 1901-7R 81 V0,V2,V3
12.0 2.0 12.0 2.0 CM 2320-7 79 DM 2320-7 80 LM 2320-7 77 A
15.0 1.7 15.0 1.7 CM 2540-7 80 DM 2540-7 80 LM 2540-7 78 H
5.1 5.0 12.0 0.7 12.0 0.7 CM 3020-7 76 DM 3020-7 77 LM 3020-7 73 F
5.1 5.0 15.0 0.6 15.0 0.6 CM 3040-7 76 DM 3040-7 76 LM 3040-7 71 U
Table 2: Class II equipment (double insulation)
Output 1 Output 2 Output 3 Input Voltage Range and Efficiency 1 Option
U
o nom
I
o nom
U
o nom
I
o nom
U
o nom
I
o nom
U
i min...
U
i max
η
min
U
i min...
U
i max
η
min
U
i min...
U
i max
η
min
V DC A V DC A V DC A 28...140 V DC %44...220 V DC %88...372 V DC %
(85...264 V A C)
5.1 8.0 CMZ 1001-7R 74 DMZ 1001-7R 74 LMZ 1001-7R 73 –9
12.0 4.0 CMZ 1301-7R 80 DMZ 1301-7R 81 LMZ 1301-7R 79 E
15.0 3.4 CMZ 1501-7R 82 DMZ 1501-7R 82 LMZ 1501-7R 78 P
24.0 2.0 CMZ 1601-7R 82 DMZ 1601-7R 83 LMZ 1601-7R 81 D0…D9
48.0 1.0 CMZ 1901-7R 82 DMZ 1901-7R 83 LMZ 1901-7R 81 V0,V2,V3
12.0 2.0 12.0 2.0 CMZ 2320-7 79 DMZ 2320-7 80 LMZ 2320-7 77 A
15.0 1.7 15.0 1.7 CMZ 2540-7 80 DMZ 2540-7 80 LMZ 2540-7 78 H
5.1 5.0 12.0 0.7 12.0 0.7 CMZ 3020-7 76 DMZ 3020-7 77 LMZ 3020-7 73 F
5.1 5.0 15.0 0.6 15.0 0.6 CMZ 3040-7 76 DMZ 3040-7 76 LMZ 3040-7 71 U
1Efficiency measured at
U
i nom and
I
o nom
M-Family DC-DC Converters <100 W Rugged Environment
7 - 4 Edition 2/96 - © Melcher AG
MELCHER
The Power Partners.
7.1
Safety and Installation Instructions
Safety
For safety reasons, the power supply modules must be wired via the female connector H11 (according to DIN 41612,
see section "Accessories") in order to meet national and international safety requirements!
If the output circuit of a DC-DC converter is operator-acces-
sible according to the IEC 950 related safety standards, it
shall be an SELV circuit (Safety Extra Low Voltage circuit,
i.e. a circuit, separated from mains by at least basic insula-
tion, that is so designed and protected that under normal
and single fault conditions, the voltage between any two
conductors and between any conductor and earth does not
exceed 60 V DC).
In the following section an interpretation is provided of the
IEC 950 safety standard with respect to the saf ety status of
the output circuit. Ho wever , it is the sole responsibility of the
installer or user to assure the compliance with the relevant
and applicab le safety standards.
Since the M-f amily DC-DC con verters provide double or re-
inforced insulation between input and output, based on an
input voltage of 250 V AC and 400 V DC, only operational
insulation between the AC mains and the input of the DC-
DC converter is needed according to the following table.
If the table below is observed, the output of a DC-DC con-
verter is considered to be an SELV circuit up to a nominal
output voltage of 36 V.
Table 3: Insulation concept
Nominal Minimum required grade of Maximum Minimum required safety Minimum required grade Resulting
mains isolation, to be provided by output status of the front end of isolation between the safety
supply the AC-DC front end, voltage output circuit input and the output status
voltage including mains supplied from the provided by the of the
(AC) battery charger front end DC-DC converter DC-DC
output
≤250V Operational ≤400 V 1 Primary circuit Reinforced, based on SELV
AC 250 V and DC 400 V 1 circuit
1With LMZ converters, the maximum rated output voltage of the front end is 250 V according to IEC 950.
AM...LM types correspond to class I equipment, while the
C/D/LMZ types correspond to class II equipment.
In classI equipment the connector protective earthing pin is
leading while it is omitted in class II equipment (no protec-
tive earthing is required). Class II equipment provides rein-
forced insulation between input and output circuitry and
also between input and case. There are two class II Y-ca-
pacitors connected in series between input and output cir-
cuitry instead of ha ving Y-capacitors connected to the case .
During the production process , all transformers and each of
the fully assemb led modules are individually tested for elec-
tric strength and earth continuity (see "Supplementary
Data"). All electric strength tests are performed as factory
tests.
The UL 1950 recognition limits the maximum ambient op-
erational temperature of the standard modules to
T
A =
T
A max –15 K. Option U allows the oper ation in applications
where the full operational temperature range according to
the relevant data sheet and UL 1950 recognition is re-
quired.
Important Advice
Electric strength tests should not be repeated in the field. Improper test methods, for example overshooting or oscillating
test voltages, voltage slopes exceeding 1 kV/µs, internal Y-capacitors not carefully discharged, etc. can cause severe
damage to switching devices and ICs. Melcher AG will not honour any guarantee/warranty claims resulting from high
voltage field tests.
Rugged Environment DC-DC Converters <100 W M-Family
Edition 2/96 - © Melcher AG 7 - 5
MELCHER
The Power Partners.
7.1
Installation Instructions
Installation of the power supply must strictly follow the na-
tional safety regulations. To observe the safety require-
ments according to EN 60950/IEC 950, the module shall be
connected via the female connector type H11 (see section
"Accessories"). Other installation methods may not meet
the safety requirements. A second fuse should be installed
in the wiring to pin 29 if:
– Local requirements demand an individual fuse in each
source line
– Input to earth impedance is high or undefined
– Phase and neutral of the mains are not defined (AC-DC
converters)
Reverse polarity at the input of A...D/FM and C/DMZ types
will cause the fuse to blow . In E/LM and LMZ types a series
diode will protect the module. A series diode is not incorpo-
rated in A...D/FM and C/DMZ types to avoid unwanted
power loss.
Whenever the inhibit function is not required, pin 2 (i)
should be connected to pin 23 to enable the output(s).
Table 4: H11 connector pin allocation
Electrical Determination A…LM 1000 C/D/LMZ 1000 A…LM 2000 C/D/LMZ 2000 A…LM 3000 C/D/LMZ 3000
Pin Ident Pin Ident Pin Ident Pin Ident Pin Ident Pin Ident
Inhibit control input 2 i 2 i 2 i 2 i 2 i 2 i
Safe Data or ACFAIL 5 D or V 5 D or V 5 D or V 5 D or V 5 D or V 5 D or V
Output voltage (positive) 8 Vo1+ 8 Vo1+ 8 8 8 Vo3+ 8 Vo3+
Output voltage (negative) 11 Vo1– 11 Vo1– 11 11 11 Vo3– 11 Vo3–
Control input + 1 14 R 14 R
Control input – 17 G 17 G
Output voltage (positive) 14 Vo2+ 14 Vo2+ 14 Vo2+ 14 Vo2+
Output voltage (negative) 17 Vo2– 17 Vo2– 17 Vo2– 17 Vo2–
Output voltage (positive) 20 Vo1+ 20 Vo1+ 20 Vo1+ 20 Vo1+ 20 Vo1+ 20 Vo1+
Output voltage (negative) 23 Vo1– 23 Vo1– 23 Vo1– 23 Vo1– 23 Vo1– 23 Vo1–
Protective earthing 2 26 26 26
DC input voltage 3 29 Vi+ 29 Vi+ 29 Vi+ 29 Vi+ 29 Vi+ 29 Vi+
DC input voltage 32 Vi– 32 Vi– 32 Vi– 32 Vi– 32 Vi– 32 Vi–
AC input voltage 4 29 N 29 N 29 N 29 N 29 N 29 N
AC input voltage 32 P 32 P 32 P 32 P 32 P 32 P
1This function is not simultaneously available with option P
2Leading pin (pregrounding)
3A/B/C/D/E/FM and C/ DMZ types
4LM/LMZ types
Degree of Protection
Condition: Female connector fitted to the unit
IP 40: All units, except those with options P, A, K, D or V with potentiometer adjustment.
IP 30: All units, except those with option P, D or V with potentiometer adjustment.
IP 20: All units fitted with options which include potentiometer setting.
Leakage Currents and Insulation
Please refer to "Supplementary Data"
M-Family DC-DC Converters <100 W Rugged Environment
7 - 6 Edition 2/96 - © Melcher AG
MELCHER
The Power Partners.
7.1
Functional Description
The input voltage is fed via an input fuse, an input filter, a
rectifier 3 and an inrush current limiter 4 to the input capaci-
tor. This capacitor sources a single transistor forward con-
verter. Each output is powered by a separate secondary
winding of the main transformer. The resultant voltages are
rectified and their ripples smoothed by a power choke and
an output filter. The control logic senses the main output
voltage
U
o1 and generates, with respect to the maximum
admissible output currents, the control signal for the pri-
mary switching transistor. This signal is fed back via a cou-
pling transformer.
The auxiliary outputs
U
o2 and
U
o3 are individually regulated
by means of secondary switching transistors. Each aux-
iliary output's current is sensed using a current transf ormer.
If one of the outputs is driven into current limit, the other
outputs will reduce their output voltages as well because all
output currents are controlled by the same control circuit.
Fig. 1b
DC-DC (AC-DC) converter block diagram,
class II equipment (double insulation)
1Transient suppressor (VDR) in C/D/E/F/ LM and C/D/LMZ
2Transient suppressor diode in A/B/C/FM and CMZ types
3Bridge rectifier in LM/LMZ, series diode in EM types
4Inrush current limiter (NTC) in C/D/E/LM and C/D/LMZ types
(option E: refer to the description of option E)
5Single output modules A...LM 1000 and C/D/LMZ 1000 with
feature R
Fig. 1a
DC-DC (AC-DC) converter block diagram, class I equipment
Input filter
Output 1
filter
Output 3
filter
Output 2
filter
Control
circuit
Main control circuit
Control
circuit
12
Fuse
P
29
11
8
23
5
26
32
17
14
20
2
14
17
4
3
Forward converter
approx. 70 kHz
5
5
Y
Y
MKT
MKT
Input filter
Output 1
filter
Output 3
filter
Output 2
filter
Control
circuit
Main control circuit
Control
circuit
12
Fuse
P
29
11
8
23
5
32
17
14
20
2
14
17
4
3
Forward converter
approx. 70 kHz
5
5
Y
Y
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MELCHER
The Power Partners.
7.1
Table 5b: Input data
Input DM/DMZ EM LM/LMZ
Characteristics Conditions min typ max min typ max min typ max Unit
U
iInput voltage range
I
o = 0…
I
o nom - - 85 264 V AC 1
T
C min…
T
C max 44 220 67 385 88 372 V DC
U
i nom Nominal input voltage 110 220 310
I
iInput current
U
i nom,
I
o nom 20.55 0.275 0.20 A
P
i 0 No-load input power:
U
i nom
Single output
I
o1,2,3 = 0 1 1.5 1 1.5 1 1.5 W
Double output 7 9 7 9 7 9
Triple output 6 9 6 9 6 9
P
i inh Idle input power inhibit mode 1.5 1.5 1.5 W
I
inr p 6Peak inrush current
U
i
=
U
i max 110 4160 460 4A
t
inr r Rise time
R
S = 0 Ω 340 40 300 µs
t
inr h Trailing edge half-life
T
C = 25°C250 240 900
R
iInput resistance
T
C = 25°C 2000 4 2400 4 6200 4 mΩ
C
iInput capacitance 140 270 140 270 140 270 µF
U
i abs Input voltage limits 0 400 5-400 400 -400 400 V DC
without any damage – – – – 0 284 V AC
1In AC powered mode: LM types: 47...440 Hz; LMZ types: 47...65 Hz
2With multiple output modules, the same condition for each output applies.
3
R
S = source resistance.
4Value for initial switch-on cycle.
51 s max., duty cycle 1% max.
6
I
inr p
=
U
i/(
R
s
+
R
i)
Electrical Input Data
General conditions:
–
T
A = 25°C, unless
T
C is specified.
– Connector pins 2 and 23 interconnected, with option P:
U
o =
U
o nom, R input not connected.
Table 5a: Input data
Input AM BM FM CM/CMZ
Characteristics Conditions min typ max min typ max min typ max min typ max Unit
U
iInput voltage range
I
o = 0…
I
o nom 8 35 14 70 20 100 28 140 V DC
U
i nom Nominal input voltage
T
C min…
T
C max 15 30 50 60
I
iInput current
U
i nom,
I
o nom 2 4.0 2.0 2.0 1.0 A
P
i 0 No-load input power:
U
i nom
Single output
I
o1,2,3 = 0 1 1.5 1 1.5 1 1.5 1 1.5 W
Double output 7 9 7 9 7 9 7 9
Triple output 6 9 6 9 6 9 6 9
P
i inh Idle input power inhibit mode 1.5 1.5 1.5 1.5 W
I
inr p 6 Peak inrush current
U
i
=
U
i max 400 500 400 170 4 A
t
inr r Rise time
R
S = 0 Ω 360 50 40 60 µs
t
inr h Trailing edge half-life
T
C = 25°C170 100 60 280
R
iInput resistance
T
C = 25°C 87.5 140 250 824 4 mΩ
C
iInput capacitance 2600 4000 670 1100 370 600 370 600 µF
U
i abs Input voltage limits 0 40 0 80 0 120 0 160 V DC
without any damage
M-Family DC-DC Converters <100 W Rugged Environment
7 - 8 Edition 2/96 - © Melcher AG
MELCHER
The Power Partners.
7.1
Input fuse
A fuse holder containing a slow-blow type fuse (Dimension:
5 × 20 mm) is mounted in the conver ter's back plate. The
fuse protects the module against severe defects. It may not
fully protect the module at input voltages exceeding
200 V DC. In applications where the converters operate at
DC source voltages above 200 V DC, an external fuse or a
circuit breaker at system level should be installed.
For applications where the fuse should be inaccessible:
see option F.
Input Under-/Overvoltage Cut-out
If the input voltage remains below 0.8
U
i min or exceeds
1.1
U
i max (approx. values), an internally generated inhibit
signal disables the output(s). When checking this function
the absolute maximum input voltage rating
U
i abs must be
carefully considered (see table "Input Data").
Inrush Current
The C...LM and C/D/LMZ (excluding FM) modules incorpo-
rate a NTC resistor in the input circuitry which (during the
initial switch-on cycle) limits the peak inrush current to
avoid damage to connectors and switching devices. Subse-
quent switch-on cycles within a short interval will cause an
increase of the peak inrush current due to the warming up
of the NTC resistor. Refer also to option E description.
Table 6: Fuse types (slow-blow)
Series Schurter type Part number
AM 1000...3000 SPT 10 A 250 V 0001.2514
BM 1000...3000 SPT 8 A 250 V 0001.2513
FM 1000...3000 SPT 5 A 250 V 0001.2511
CM/CMZ 1000...3000 SPT 3.15 A 250 V 0001.2509
DM/DMZ 1000...3000 SPT 2.5 A 250 V 0001.2508
EM 1000...3000
LM/LMZ 1000...3000
U
i
DC
________
U
i min
DC
23456
1
0.10
1.00
10.00
AM
I
i
[A]
LM/LMZ
BM
FM
CM/CMZ
DM/DMZ
EM
350
300
50; 250
40; 200
30; 150
20; 100
10; 50
0
400
00.8
2.0 1.0
2.5 1.2
3.0 1.4
3.5 1.6
4.0
0.6
1.5
0.4
1.0
0.2
0.5
AM
BM
CM/CMZ
FM
EM
A…EM
LM
I
i [A]
LM/LMZ
DM/DMZ
t
[ms]
LM
A…FM
Fig. 3
Typical inrush current at initial switch-on cycle and at
U
i max
[DC] versus time
Fig. 2
Typical input current versus relative input voltage at
nominal output load
Rugged Environment DC-DC Converters <100 W M-Family
Edition 2/96 - © Melcher AG 7 - 9
MELCHER
The Power Partners.
7.1
Electrical Output Data
General conditions
–
T
A = 25°C, unless
T
C is specified.
– Connector pins 2 and 23 interconnected,
U
o =
U
o nom (option P), R input not connected.
Table 7: Output data
Output
U
o nom 5.1 V 12 V 15 V 24 V 48 V
Characteristics Conditions min typ max min typ max min typ max min typ max min typ max Unit
U
oOutput voltage
U
i nom,
I
o nom 1 5.07 5.13 11.93 12.07 14.91 15.09 23.86 24.14 47.72 48.28 V
U
o L Overvoltage prot.
I
o nom 7.5 21 25 41 85
I
o nom Output current
U
i min...
U
i max see tables 1 and 2
I
o L Output current
T
C min...
T
C max see fig. 4
limitation response
u
o1/2/3 Output voltage noise
U
i nom,
I
o nom 124 36 36 36 48mV
rms
u
o1 Bandwidth = 15 30 25 50 35 70 40 80 50 100 mVpp
u
o2/3 20 MHz 60 120 40 80 40 80 40 80 -
∆
U
o U Static line regulation
U
i min...
U
i nom ±10 ±30 ±12 ±50 ±15 ±60 ±15 ±60 ±15 ±60 mV
U
i nom...
U
i max
I
o nom 1
∆
U
o I Static load regulation
U
i nom 6 25 1350 1760 3080 60150
I
o =
I
o nom...0 2
∆
U
o Ic Static cross load
U
i nom 0±15 0 ±20 0 ±30 0 ±40 -
regulation 4
I
o =
I
o nom...0 3
u
o d Dynamic load
U
i nom,±220 ±110 ±150 ±130 ±150
regulation
I
o =
t
dDynamic load regu- 1/0.33/1•
I
o nom 20.6 0.6 0.5 1 2 ms
lation time constant fig. 5
u
o dc Dynamic cross load
U
i nom, +10 +10 +10 +20 - mV
regulation 4
I
o = -100 -75 -140 -200 -
t
dc Dynamic cross load 1/0.33/1•
I
o nom 3 0.05 0.2 0.5 1 - ms
reg. time constant 4 fig. 5 0.5 0.3 0.7 2 -
αUo Output voltage
T
C min...
T
C max ±0.02 ±0.02 ±0.02 ±0.02 ±0.02 %/K
deviation versus
case temperature ±1.0 ±2.4 ±3.0 ±4.8 ±9.6 mV/K
1With multiple output modules, the same condition for each output applies.
2Condition for specified output. With multiple output modules, other output(s) loaded with constant current
I
o =
I
o nom.
3Condition for non-specified output, individually tested, other output(s) loaded with constant current
I
o =
I
o nom.
4Multiple output modules.
Output Protection
Each output is protected against overvoltages which could
occur due to a failure of the inter nal 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
applied overvoltages. Overload at any of the outputs will
cause a shut-down of all outputs. A red LED indicates the
overload condition of the respective output.
Parallel and Series Connection
Main outputs of equal nominal voltage can be connected in
parallel. It is important to assure that the main output of a
multiple output module is forced to supply a minimum cur-
rent of 0.1 A to enable correct operation of its own auxiliary
outputs.
In parallel operation, one or more of the main outputs may
operate continuously in current limit which will cause an in-
crease in case temperature. Consequently, a reduction of
the max. ambient temperature by 10 K is recommended.
Main or auxiliary outputs can be connected in series with
any other output of the same or another module. In series
connection, the maximum output current is limited by the
lowest current limit. Output ripple and regulation values are
added. Connection wiring should be kept as short as possi-
ble.
If output terminals are connected together in order to estab-
lish multi-voltage configurations, e.g. +5.1 V, ±12 V etc. the
common ground connecting point should be as close as
possible to the connector of the converter to avoid exces-
sive output ripple voltages.
Auxiliary outputs should never be connected in parallel!
M-Family DC-DC Converters <100 W Rugged Environment
7 - 10 Edition 2/96 - © Melcher AG
MELCHER
The Power Partners.
7.1
Output Current Allocation for special Types
Output currents differing from those given for standard
types (as per "Type Survey") can be provided. A maxim um
output power of 50 W should be considered, if an ambient
temper ature range of –25...71°C is required. The maximum
permissible output currents are indicated in the tab le below .
If (upon customer's request) output voltages are different
from standard values, the relevant output currents have to
be adapted accordingly.
With reduced maximum ambient temperature or with forced
cooling, the total output power may exceed 50 W. Custom-
ized configurations always need to be checked by a feasi-
bility study first. Please ask Melcher's sales engineers for a
proposal appropriate to your specific needs.
Inhibit (i Input)
The outputs of the module may be enabled or disabled by
means of a logic signal (TTL, CMOS, etc.) applied to the
inhibit input. If the inhibit function is not required, connect
the inhibit pin 2 to pin 23 to enable the outputs (active low
logic, fail safe).
The reference for the inhibit signal is the negative pin of
output 1.
Table 8: Current allocation with special types
Output voltage Output 1 Output 2 Output 2 Output 3 Temperature
all types all types A...LM 2000 A...LM 3000 A...LM 3000
U
o1/2/3 nom [V]
I
o1 max [A]
I
o2 max [A]
I
o2 max [A]
I
o3 max [A]
T
A [°C]
T
C [°C]
5.1 8.0 4.0 1.8 (2.5 1) 1.5 –25...71 –25...95
12 4.0 2.0 1.5 1.2
15 3.4 1.7 1.2 1.0
24 2.0 1.0 0.7 0.5
25.1 10.0 4.5 2.1 (2.8 1) 1.8 –25...60 –25...90
12 5.0 2.5 1.7 1.5
15 4.0 2.0 1.5 1.3
24 2.5 1.3 0.9 0.7
5.1 11.0 5.0 2.4 (3.0 1) 2.0 –25...50 –25...85
12 6.0 3.0 2.0 1.7
15 4.6 2.3 1.7 1.5
24 3.0 1.5 1.0 0.8
1Special high current components required, 2
U
i min has to be increased
Fig. 4
Typical output voltage U
o1
versus output currents
I
o
Vo–
i
Vo+
I
inh
U
inh
Vi+
Vi–
1.6
0.8
0
-0.8
-50-40 20 40
U
inh [V]
I
inh [mA]
-30 0
-20 -10 10 30 50
2.0
1.2
0.4
-0.4
U
inh= 0.8 V
U
o = on
U
o = off
U
inh= 2.4 V
1.0
0
0.5
U
o1
0.5
U
o1 nom
I
o
I
o nom
1.0 1.2
I
o nom
I
o1
I
o2,
I
o3
I
oL1
I
oL2,
I
oL3
AM...LM and C/D/LMZ
.95
∆
U
o
I
o/
I
o nom
3/3
2/3
1/3
0
t
t
u
od
u
od
t
d
t
d
==
==
≥10 µs
≥10 µs
Fig. 5
Control deviation of U
o
versus dynamic load change
Fig. 6
Definition of inhibit voltage and current Fig. 7
Typical inhibit current I
inh
versus inhibit voltage U
inh
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MELCHER
The Power Partners.
7.1
Table 9: Inhibit data
Characteristics Conditions min typ max Unit
U
inh Inhibit input voltage causing switched on
U
i min...
U
i max –50 0.8 V DC
output voltage being… switched off 2.4 50
I
inh Inhibit current
U
inh = 0 –60 –100 –220 µA
Table 10: Output response time t
r
, values not applicable for modules equipped with option E
Type of Converter
t
r at
P
o =0 and
t
f at
P
o =
P
o nom
t
r and
t
f at
P
o = 3/4
P
o nom
t
r at
P
o =
P
o nom Unit
typ max typ max typ max
A...LM 1001-7R and C/D/LMZ 1001-7R 5 10 5 10 10 20 ms
A...LM 1301-7R and C/D/LMZ 1301-7R 10 20 15 30 20 40
A...LM 1501-7R and C/D/LMZ 1501-7R 5 10 10 20 30 60
A...LM 1601-7R and C/D/LMZ 1601-7R 15 30 25 50 40 80
A...LM 1901-7R and C/D/LMZ 1901-7R 65 130 100 200 165 330
A...LM 2320-7 and C/D/LMZ 2320-7 20 40 30 60 50 100
A...LM 2540-7 and C/D/LMZ 2540-7 15 30 20 40 35 70
A...LM 3020-7 and C/D/LMZ 3020-7 55 110 85 170 145 290
A...LM 3040-7 and C/D/LMZ 3040-7 40 80 60 120 100 200
Conditions:
R input not used. For multiple output modules the figures indicated in the table above relate to the output which reacts
slowest. All outputs are resistively loaded. Variation of the input voltage within
U
i min...
U
i max does not influence the values.
Hold-up Time and Output Response
When the input voltage is switched off the output voltage
will remain high for a certain hold-up time
t
h (fig. 8) before
the output voltage falls below 0.95
U
o nom . To achieve the
hold-up times indicated in fig. 9, A/B/C/D/FM and C/ DMZ
modules require an external series diode in the input path.
This is necessary to prevent the discharge of the input ca-
pacitor through the source impedance or other circuits con-
nected to the same source. E/LM and LMZ modules have a
built-in series diode. In A/B/C/D/FM and C/DMZ modules,
no series diode is built-in, since it would generate up to
10 W of additional power loss inside the converter. Conse-
quently the maximum operational ambient temperature
would have to be reduced accordingly.
The behavior of the outputs is similar with either the input
voltage applied or the inhibit switched low.
An output voltage overshoot will not occur when the module
is turned on or off.
Fig. 8
Output response as a function of input voltage (on/off
switching) or inhibit control
Fig. 9
Typical hold-up time t
h
versus relative input voltage at I
o nom
234561
0.10
1.00
1000.00
U
i DC
_____
U
i min DC
t
h
[ms]
10.00
100.00
LM/LMZ
EM
C/DM, C/DMZ
A/B/FM
0
t
r
t
f
t
t
0
Inhibit
1
Output
0.1
U
o nom
t
0
1
0.95
U
o nom
t
h
U
i
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MELCHER
The Power Partners.
7.1
Table 11a: R
ext
for U
o
< U
o nom
(conditions: U
i nom
, I
o nom
, rounded up to resistor values E 96, R
ext'
=
∞
)
U
o nom = 5.1 V
U
o nom = 12 V
U
o nom = 15 V
U
o nom = 24 V
U
o nom = 48 V
U
o [V]
R
ext [kΩ]
U
o [V]
R
ext [kΩ]
U
o [V]
R
ext [kΩ]
U
o [V]
R
ext [kΩ]
U
o [V]
R
ext [kΩ]
0.5 0.432 2.0 0.806 2.0 0.619 4.0 0.806 8.0 0.806
1.0 0.976 3.0 1.33 4.0 1.47 6.0 1.33 12.0 1.33
1.5 1.65 4.0 2.0 6.0 2.67 8.0 2.0 16.0 2.0
2.0 2.61 5.0 2.87 8.0 4.53 10.0 2.87 20.0 2.87
2.5 3.83 6.0 4.02 9.0 6.04 12.0 4.02 24.0 4.02
3.0 5.76 7.0 5.62 10.0 8.06 14.0 5.62 28.0 5.62
3.5 8.66 8.0 8.06 11.0 11.0 16.0 8.06 32.0 8.06
4.0 14.7 9.0 12.1 12.0 16.2 18.0 12.1 36.0 12.1
4.5 30.1 10.0 20.0 13.0 26.1 20.0 20.0 40.0 20.0
5.0 200.0 11.0 44.2 14.0 56.2 22.0 44.2 44.0 44.2
Fig. 10
Output voltage control by means of the R input
Table 11b: R'
ext
for U
o
> U
o nom
(conditions: U
i nom
, I
o nom
, rounded up to resistor values E 96, R
ext
=
∞
)
U
o nom = 5.1 V
U
o nom = 12 V
U
o nom = 15 V
U
o nom = 24 V
U
o nom = 48 V
U
o [V]
R'
ext [kΩ]
U
o [V]
R'
ext [kΩ]
U
o [V]
R'
ext [kΩ]
U
o [V]
R'
ext [kΩ]
U
o [V]
R'
ext [kΩ]
5.15 464 12.1 1780 15.2 1470 24.25 3160 48.5 6810
5.20 215 12.2 909 15.4 750 24.50 1620 49.0 3480
5.25 147 12.3 619 15.6 511 24.75 1100 49.5 2370
5.30 110 12.4 464 15.8 383 25.00 825 50.0 1780
5.35 90.9 12.5 383 16.0 332 25.25 715 50.5 1470
5.40 78.7 12.6 316 16.2 274 25.50 590 51.0 1270
5.45 68.1 12.7 274 16.4 237 25.75 511 51.5 1100
5.50 61.9 12.8 249 16.5 226 26.00 453 52.0 953
13.0 200 26.25 402 52.5 845
13.2 169 26.40 383 52.8 806
Programmable Voltage (R Input)
As a standard feature single output modules offer an
adjustable output voltage identified by letter R in the type
designation. The control input R (pin 14) accepts either a
control voltage
U
ext or a resistor
R
ext to adjust the desired
output voltage. When not connected, the control input auto-
matically sets the output voltage to
U
o nom. The control input
is protected against external overvoltage up to 8 V max.
a) Adjustment by means of an external control voltage
U
ext
between pin 14 (R) and pin 17 (G):
The control voltage range is 0...2.75 V and allows an
adjustment in the range of approximately
U
o = 0...110%
U
o nom.
U
o
U
ext ≈ –––––– • 2.5 V
U
o nom
b) Adjustment by means of an external resistor:
Depending upon the value of the required output volt-
age, the resistor shall be connected
either: Between pin 14 and pin 17 (
U
o <
U
o nom) to
achieve an output voltage adjustment range of approx.
U
o = 0...100%
U
o nom
U
o
R
ext ≈ 4 kΩ • –––––––––
U
o nom –
U
o
or: Between pin 14 and pin 20 (
U
o >
U
o nom) to achieve
an output voltage adjustment range of approximately
U
o = 100...110% of
U
o nom.
(
U
o – 2.5 V)
R'
ext ≈ 4 kΩ • ––––––––––––––––––
2.5 V •(
U
o/
U
o nom – 1)
For output voltages
U
o >
U
o nom, the minimum input voltage
according to "Electrical Input Data" increases proportionally
to
U
o/
U
o nom.
Warning
20
32 23
29
R
Vo1+
Vo1–
G
+
U
ext
AM…LM 1000
C/D/LMZ 1000
20
14
32 23
R
Vo1+
Vo1–
G
R
ext
R'
ext
17
17
14
–
AM…LM 1000
C/D/LMZ 1000
4 kΩ2.5 V
29
control
circuit
4 kΩ2.5 V
control
circuit
Vi+
Vi–
Vi+
Vi–
The value of
R'
ext should never be less than 47 kΩ to avoid
damage to the unit! R inputs may be parallel connected, but
1/Rtot = 1/R1 + 1/R2 +.... should be considered.
Remark
The R-feature excludes option P (output voltage adjust-
ment by potentiometer).
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7.1
which typically occur in most installations, but especially in
battery dr iven mobile applications. The M-family has been
successfully tested to the following specifications:
EMC and Immunity to Input Transients
A suppressor diode or a metal oxide VDR (depending upon
the type) together with an input fuse and an input filter form
an effective protection against high input transient voltages
units are available on customer's request. Standard DM units
(110 V battery) will not be damaged, but overvoltage lock-out
will occur during the surge
6In correspondence with DIN 57435 part 303 and VDE 0435 part
303 (1984-09)
Phenomenon
Standard
Level
Value
applied
Waveform
Source
impedance
Test
procedure
In operation
Performance
Electromagnetic Immunity
Table 12: Immunity type tests
Impulse voltage IEC 255-4 III i/o, i/c, o/c 5000 Vp1.2/50 µs 500 Ω3 pos. and 3 neg. no
App. E4 6 +i/–i, +o/–o impulses per
(1976) coupling mode
High frequency IEC 255-4 III i/o, i/c, o/o, o/c 2500 Vp400 damped 200 Ω2 s per yes 1
disturbance App. E5 6 +i/–i, +o/–o 1000 Vp1 MHz waves/s coupling mode
(1976)
Voltage surge IEC 571-1 3 i/c, +i/–i 800 Vp100 µs 100 Ω1 pos. and 1 neg. yes 1
(1990-07) 1500 Vp50 µsvoltage surge per
3000 Vp5 µscoupling mode
4000 Vp1 µs
7000 Vp100 ns
Supply related RIA 12 A 5+i/–i 3.5 •
U
batt 20 ms 0.2 Ω1 positive yes 1
surge (1984) B 1.5 •
U
batt 1 s surge
Direct transient C 960 Vp10/100 µs5 Ω5 pos. and 5 neg.
D 1800 Vp5/50 µsimpulses
E 3600 Vp0.5/5 µs 100 Ω
F 4800 Vp0.1/1 µs
G 8400 Vp0.05/0.1 µs
Indirect coupled H i/c 1800 Vp5/50 µs
transient J 3600 Vp0.5/5 µs
K 4800 Vp0.1/1 µs
L 8400 Vp0.05/0.1 µs
Electrostatic IEC 801-2 4 contact discharge 8000 Vp1/50 ns 330 Ω10 positive and yes 1
discharge (1991-04) to case, 10 negative
air dischg. to case 15000 Vpdischarges
Electric field IEC 801-3 3 antenna in 10 V/m AM modulated 26…1000 MHz yes 2
(1984) 1 m distance 80%, 1 kHz
Fast transient/ IEC 801-4 3 i/c, +i/–i 2000 Vpbursts of 5/50 ns 50 Ω1 min positive yes 1
burst (1988) 5 kHz rep. rate 1 min negative
transients with bursts per
15 ms burst coupling mode
duration and a
4 4000 Vp300 ms period 2
Transient IEC 801-5 4 i/c 4000 Vp1.2/50 µs 12 Ω5 pos. and 5 neg. yes 1
(Draft 1993-01) +i/–i 2000 Vp2 Ωimpulses per
coupling mode
Conducted IEC 801-6 3 i, o, signal wires 140 dBµV AM modulated 150 Ω0.15...80 MHz yes 2
disturbance (Draft 1992-12) (10 Vrms) 80%, 1 kHz
Coupling
mode 4
1Normal operation, no deviation from specifications
2Normal operation, temporary deviation from specs possible
3Will be replaced by EN 50155
4i = input, o = output, c = case
5Only met with extended input voltage range of BM (24 V bat-
tery), CM (48 V battery) and EM (110 V battery) types. These
M-Family DC-DC Converters <100 W Rugged Environment
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7.1
Table 13: Emissions at U
i nom
and I
o nom
(LM/LMZ at 230 V AC)
Types Level:
VDE 0871 VDE 0875 part 3 EN 55011, 1991 1 FCC: 47 CFR 15.xxx
6.78 12.88 EN 55022, 1987 2 15.107 15.103
≤ 30 MHz ≥30 MHz ≤ 30 MHz ≥30 MHz ≤ 30 MHz ≥30 MHz ≤ 30 MHz ≥30 MHz
AM 1000 B B N K B B B B
AM 2000 B B N K B B B B
AM 3000 B A N K B A B A
BM 1000 B B N K B B B B
BM 2000 B B N K B B B B
BM 3000 B A N K B A B A
CM 1000 B B N K B B B B
CM 2000 B B N K B B B B
CM 3000 B A N K B A B A
DM 1000 B B N K B B B B
DM 2000 B B N K B B B B
DM 3000 B A N K B A B A
EM 1000 B B N K B B B B
EM 2000 B B N K B B B B
EM 3000 B A N K B A B A
FM 1000 A B N K B B A B
FM 2000 A B N K B B A B
FM 3000 A A N K B A A A
LM 1000 B B N K B B B B
LM 2000 B B N K B B B B
LM 3000 B A N K B A B A
CMZ 1000 B A N K B A B A
CMZ 2000 - - - - - - - -
CMZ 3000 >A >A G G A >A A >A
DMZ 1000 - - - - - - - -
DMZ 2000 - - - - - - - -
DMZ 3000 - - - - - - - -
LMZ 1000 >A >A G K A >A >A >A
LMZ 2000 - - - - - - - -
LMZ 3000 A >A N N B >A A >A
1Identical with CISPR 11 (1990-09) and VDE 0875 part 11 (1992-07)
2Identical with CISPR 22 (1985) and VDE 0878 part 3 (1989-11)
Electromagnetic Emissions
Fig. 11a
Conducted RFI at input according to EN 55011 (quasi peak) Fig. 11b
Radiated RFI according to EN 55011 (Distance 10 m)
100
90
80
70
60
50
40
30
20
10
0
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
10
20
30
B
Frequency [MHz]
A
[dBµV]
100
90
80
70
60
50
40
30
20
10
0
30
50
100
200
500
1000
A
B
Frequency [MHz]
[dBµV/m]
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7.1
Supplementary Data Important Advice
Testing by applying AC voltages will result in high and
dangerous leakage currents through the Y-capacitors
(see fig. 1). Melcher will not honour any guarantee/war-
ranty claims resulting from high voltage field tests. Ref-
erence is also made to chapter: Safety and Installation
Instructions.
Isolation
Input to output electric strength tests, in accordance with
the safety standards IEC 950, EN 60950, VDE 0805 and
EN 41003 are performed as factory tests and should not be
repeated in the field.
Fig. 12
Definition of leakage currents and measurement proce-
dure by means of the measuring device MD
Table 15: Leakage currents
Characteristic Class I (LM) Class II (LMZ) Unit
a) permissible according to IEC 950 a) b) a) b)
b) value at 264 V, 50 Hz max max max max
Earth leakage current 3.5 1.4 – – mA
Enclosure leakage current – – 0.25 0.03
Output leakage current 0.25 0.005 0.25 0.15
MD for enclosure
leakage current
MD for output
leakage current
MD for earth
leakage current
MD for output
leakage current
connection to case
LMZ 1000…LMZ 3000
LM 1000…LM 3000
+
–
+
–
1500 Ω
150 nF
V
MD
∼
∼
∼
∼
Leakage Currents in AC-DC operation
Leakage currents will flow due to internal leakage capa-
citances and RFI suppression Y-capacitors. The current
values are proportional to the mains voltage and nearly pro-
portional to the mains frequency and are specified at an in-
put condition of 264 V/50 Hz where phase, neutral and pro-
tective earth are correctly connected as required for class I
equipment. Under test conditions the leakage currents flow
through a measurement circuit, consisting of a 1500 Ω re-
sistance with a 150 nF capacitor connected in parallel. The
voltage drop across this element is measured and the cur-
rent value calculated from the measured voltage divided by
1500 Ω.
If inputs of M-units are connected in parallel, their individual
leakage currents are added.
Table 14: Electric strength test voltage, insulation resistance, clearance and creepage distances
Characteristic Input/Output Input/Case Input/Case Output/Case Output/Output Unit
a) values according to IEC 950, Class I Class II
b) Product's performance a) b) a) b) a) b) a) b) a) b)
Electric strength DC: 1 s 4243 1 560012122 2800 4243 5600 707 1414 – 300 V
test voltage AC: 50 Hz, 1 min 3000 1 4000 1 1500 2000 3000 4000 500 1000 – 200
Insulation resistance at 500 V DC – ≥300 – ≥300 – ≥300 – ≥100 – – MΩ
Clearance and AM/BM 4.0 5.0 2.0 4.0 4.0 5.0 1.0 2.0 – 0.9 mm
Creepage distances C...LM and C/D/LMZ 4.0 8.0 2.0 4.0 4.0 5.0 1.0 2.0 – 0.9
1Only subassemblies performance in accordance with IEC 950
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7.1
Display Status of LEDs
U
o1 > 0.95…0.98
U
o1 adj
U
i max
U
i ov
U
i min
U
i uv
U
i
U
i abs
OKi
U
o1 > 0.95…0.98
U
o1 adj
I
o nom
I
oL
I
o
OK
Io L
U
o1 < 0.95…0.98
U
o1 adj
T
C
i
T
C max
T
PTC threshold
U
i inh
i
+50 V
+0.8 V +2.4 V
-50 V
U
inh threshold
LED off LED on
LED Status undefined
Fig. 13
LEDs
"OK"
and
"i"
status versus input voltage
Conditions: I
o
≤
I
o nom
, T
C
≤
T
C max
, U
inh
≤
0.8 V
U
i uv
= undervoltage lock-out, U
i ov
= overvoltage lock-out
LED
"OK"
and
"Io L"
status versus output current
Conditions: U
i min...
U
i max
, T
C
≤
T
C max
, U
inh
≤
0.8 V
LED
"i"
versus case temperature
Conditions: U
i min...
U
i max
, I
o
≤
I
o nom
, U
inh
≤
0.8 V
LED
"i"
versus U
inh
Conditions: U
i min...
U
i max
, I
o
≤
I
o nom
, T
C
≤
T
C max
Table 17: Configuration of option A and option P
Type of option AM...LM/CMZ...LMZ 1000 AM...LM/CMZ...LMZ 2000 AM...LM/CMZ...LMZ 3000
Output 1 Output 1 Output 2 Output 1 Output 2 Output 3
Potentiometer 1 yes yes yes yes no no
Test sockets yes yes yes yes no no
1AM...LM 1000 types equipped with option P do not provide the R input simultaneously, pins 14 and 17 are not connected.
Option -9 Extended temperature range
Option -9 extends the operational ambient temperature
range from –25...71°C (standard) to –40...71°C. The power
supplies provide full nominal output power with convection
cooling.
Option P Potentiometer
Optionally built-in multi-turn potentiometers provide an out-
put voltage adjustment range of minimum ±5 % of
U
o nom
and are accessible through holes in the front cover. Com-
pensation of voltage drop across connector and wiring be-
comes easily achievable. For output voltages
U
o >
U
o nom,
the minimum input voltage according to "Electrical Input
Data" increases proportionally to
U
o/
U
o nom.
Note: Potentiometers are not recommended for mobile ap-
plications
Option A Test sockets
Test sockets (pin Ø = 2 mm, distance d = 5.08 mm) are lo-
cated at the front of the module. The output voltage is
sensed at the connector pins inside the module.
Description of Options
Table 16: Survey of options
Option Function of Option Characteristic
–9 Extended operational ambient temperature range
T
A = –40...71°C
E Electronic inrush current limitation circuitry Extended inrush current limitation for C/E/LM, C/LMZ
P 1 Potentiometer for fine adjustment of output voltage Adjustment range ±5% of
U
o nom, excludes R input
D 2Input and/or output undervoltage monitoring circuitry Safe data signal output (D0...D9)
V 2 3 Input and/or output undervoltage monitoring circuitry ACFAIL signal according to VME specifications (V0, V2, V3)
A Test sockets at front panel for check of output voltage
U
o internally measured at the connector terminals
H Enhanced output to case electric strength test voltage 2000 V AC (standard: 1000 V AC)
F Input fuse built-in inside case Fuse not externally accessible
U UL recognized full ambient temperature range Full temperature range according to temperature suffix
1Function R excludes option P and vice versa 2Option D excludes option V and vice versa
3Only available if main output voltage
U
o1 = 5.1 V
Rugged Environment DC-DC Converters <100 W M-Family
Edition 2/96 - © Melcher AG 7 - 17
MELCHER
The Power Partners.
7.1
Fig. 16
Typical inrush current waveform of a LM type
Fig. 15
Typical inrush current waveforms of a CM and an EM type
12
10
8
6
4
2
0010 20 30 40
t
[ms]
I
i [A]
t
inr
CM type
U
i = 110 V DC
P
o =
P
o nom
EM type
U
i = 110 V DC
P
o =
P
o nom
I
inr p =
U
i / (
R
S+
R
I)
Capacitor
C
i
fully charged
Normal operation
(FET fully conducting)
I
i =
P
o /
U
i • η
6
I
i
[A]
4
2
0
-2
-4
-6
020 40 60 80
t
[ms]
t
inr
LM type
U
i
= 230 V AC
P
o
=
P
o nom
Capacitor
C
i
fully charged
Normal operation
(FET fully conducting)
Precautions:
In order to a void overload of the series resistor RI the o n/off
switching cycle should be limited to 12 s if switched on/off
continuously. There should not be more than 10 start-up
cycles within 20 s at a case temperature of 25°C.
If CM and CMZ types are driven by input voltages below
35 V DC or LM and LMZ types below 100 V AC, the maxi-
mum case temperature should be derated by 10 K or the to-
tal output power should be derated by 20%. EM, LM and
LMZ units driven by DC input voltages do not need to be
derated within the full specified input voltage range.
Availability:
Option E is available for C/E/LM and CMZ /LMZ modules
with a nominal output power of 51 W maximum.
Input Filter
Control
Converter
FET
C
i
R
I
R
S
Rectifier
(LM/LMZ types)
Fig. 14
Option E block diagram
Table 18: Inrush current characteristics with option E
Characteristic CM/CMZ EM LM/LMZ Unit
CM/CMZ/EM at
U
i = 110 V DC
LM/LMZ at
U
i = 230 VAC typ max typ max typ max
I
inr p Peak inrush current 6.5 8 2.2 4 6 10 A
t
inr Inrush current duration 22 30 19 30 35 50 ms
Option E Extended inrush current limitation
Available for C/E/LM and C /LMZ types.
The standard version of the modules C/D/E/LM as well as
C/D/LMZ include a passive inrush current limitation in the
form of a NTC resistor.
For applications which require an extended inrush current
limitation, an active electronic circuit as shown in "Option E
block diagram" has been developed. Typical inrush current
waveforms of units equipped with this option are shown
below.
CM and CMZ units meet the CEPT/ETSI standards for
48 V DC supply voltage according to prETS 300132-2 if fit-
ted with option E combined with option D6 (input voltage
monitoring). Option D6, externally adjustable via poten-
tiometer, is necessary to disable the converter at input volt-
ages below the actual service ranges, avoiding an exces-
sive input current when the input voltage is raised slowly
according to prETS 300132-2. Option D6 threshold level
U
ti
+
U
hi
(refer to description of option D) should be adjusted
to 36.0...40.5 V for 48 V DC nominal supply voltage (for 60
V DC systems, threshold should be set to 44.0...50.0 V
DC). The D output (pin 5) should be connected to the inhibit
(pin 2). For applications where potentiometers are not al-
lowed refer to option D9.
M-Family DC-DC Converters <100 W Rugged Environment
7 - 18 Edition 2/96 - © Melcher AG
MELCHER
The Power Partners.
7.1
Option D Undervoltage monitor
The input and/or output undervoltage monitoring circuit op-
erates independently of the built-in input undervoltage lock-
out circuit. A logic "low" (JFET output) or "high" signal (NPN
output)
is generated at pin 5 as soon as one of the moni-
tored voltages drops below the preselected threshold level
U
t. The retur n for this signal is Vo1– (pin 23). The D output
recovers when the monitored voltage(s) exceed(s)
U
t+
U
h.
JFET output (D0…D4):
Connector pin D is internally connected via the drain-
source path of a JFET (self-conducting type) to the nega-
tive potential of output 1.
U
D ≤ 0.4 V (logic low) corresponds
to a monitored voltage level (
U
i and/or
U
o1) <
U
t. The cur-
rent
I
D 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.
U
i,
U
o1 status D output,
U
D
U
i or
U
o1 <
U
tlow, L,
U
D ≤ 0.4 V at
I
D = 2.5 mA
U
i and
U
o1 >
U
t +
U
hhigh, H,
I
D ≤ 25 µA at
U
D = 5.25 V
NPN output (D5...D9):
Connector pin D is internally connected via the collector-
emitter path of a NPN transistor to the negative potential of
output 1.
U
D < 0.4 V (logic low) corresponds to a monitored
voltage level (
U
i and/or
U
o1) >
U
t +
U
h
. The current
I
D
through the open collector should not exceed 20 mA. The
NPN output is not protected against external overvoltages.
U
D should not exceed 40 V.
U
i,
U
o1 status D output,
U
D
U
i or
U
o1 <
U
thigh, H,
I
D ≤ 25 µA at
U
D = 40 V
U
i and
U
o1 >
U
t +
U
hlow, L,
U
D ≤ 0.4 V at
I
D = 20 mA
20
23
5
Vo1+
Vo1–
D
U
D
I
D
Vi+
Vi–
29
32
R
p
Table 19: Undervoltage monitor functions
Output type Monitoring Minimum adjustment range Typical hysteresis
U
h [% of
U
t]
JFET NPN
U
i
U
o1 of threshold level
U
tfor
U
t min...
U
t max
U
ti
U
to
U
hi
U
ho
D1 D5 no yes – 3.5 V...48 V 1 – 2.3...1
D2 D6 yes no
U
i min...
U
i max 1– 3.0...0.5 –
D3 D7 yes yes
U
i min...
U
i max 1 0.95...0.98
U
o1 2 3.0...0.5 "0"
D4 D8 no yes
–
0.95...0.98
U
o1 2
–
"0"
D0 D9 no yes – 3.5 V...48 V 3 – 1.8...1
yes no
U
i min...
U
i max 3 4 – 2.2...0.4 –
yes yes
U
i min...
U
i max 3 4 0.95...0.98
U
o1 2 2.2...0.4 "0"
1Threshold level adjustable by potentiometer (not recommended for mobile applications)
2Fixed value between 95% and 98% of
U
o1 (tracking)
3Fixed value, resistor-adjusted according to customer's specifications ±2% at 25°C; individual type number is determined by Melcher
4Adjusted at
I
o nom
Fig. 17
Options D0...D4, JFET output
Fig. 18
Options D5...D9, NPN output
5
23
20
Vo1+
Vo1–
D
U
D
≤ 6 V
I
D
29
32
Vi+
Vi–
R
p
The threshold level
U
t is either adjustable by a potentio-
meter , accessib le through a hole in the front cover, or is fac-
tory adjusted to a fixed value specified by the customer.
Option D exists in various versions D0...D9 as shown in the
following table.
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Edition 2/96 - © Melcher AG 7 - 19
MELCHER
The Power Partners.
7.1
0
1
0.95
0
U
i [V DC]
0
t
t
t
t
low min4
t
low min4
t
high min
t
h1
U
ti +
U
hi
U
ti
Input voltage failure Switch-on cycle Input voltage sag Switch-on cycle and subsequent
input voltage failure
U
D high
U
D low
U
D
0
JFET
NPN
t
U
o1
U
o1 nom
U
D high
U
D low
U
D
t
low min4
t
h1
0
0
U
D high
U
D low
U
D
0
JFET
NPN
U
o1
U
D high
U
D low
U
D
t
low min4
U
to
Output voltage failure
0
I
D high
I
D low
I
D
t
0
I
D high
I
D low
I
D
t
t
t
t
2
33 33
U
o1 nom
U
to +
U
ho
Input voltage monitoring
Output voltage monitoring
Threshold tolerances and hysteresis:
If
U
i is monitored, the internal input voltage after the input
filter and rectifier ( E/LM and LMZ types) is measured. Con-
sequently this voltage differs from the voltage at the con-
nector pins by the voltage drop ∆
U
ti across input filter and
rectifier . The threshold lev el of the D0 and D9 options is f ac-
tory adjusted at nominal output current
I
o nom and at
T
A =
25°C. The value of ∆
U
ti depends upon the input voltage
range (AM, BM, ...), threshold level
U
t, temperature and in-
put current. The input current is a function of the input volt-
age and the output power.
Fig. 20
Relationship between U
i
,
U
o1
,
U
D
,
I
D
and U
o1
/U
o nom
versus time.
1See "El. output data", for hold-up time.
2With output voltage monitoring the hold-up time
t
h = 0
3The D signal remains high if the D output is connected to
an external source.
4
t
low min = 40...200 ms, typically 80 ms
∆
U
ti
U
hi
U
D low
U
D
U
D high
U
i
P
o
=
P
o nom
P
o
= 0
P
o
= 0
U
ti
P
o
=
P
o nom
Fig. 19
Definition of U
ti, ∆
U
ti
and
U
hi
(JFET output)
M-Family DC-DC Converters <100 W Rugged Environment
7 - 20 Edition 2/96 - © Melcher AG
MELCHER
The Power Partners.
7.1
Option V ACFAIL signal (VME)
Available for units with
U
o1 = 5.1 V. This option defines an
undervoltage monitoring circuit for the input or the input and
main output voltage equivalent to option D and generates
the ACFAIL signal (V signal) which conforms to the VME
standard. The low state level of the ACFAIL signal is speci-
fied at a sink current of
I
V = 48 mA to
U
V ≤ 0.6 V (open-col-
lector output of a NPN transistor). The pull-up resistor feed-
ing the open-collector output should be placed on the VME
backplane.
After the ACFAIL signal has gone low, the VME standard
requires a hold-up time
t
h of at least 4 ms before the 5.1 V
output drops to 4.875 V when the 5.1 V output is fully
loaded. This hold-up time
t
h is pro vided by the internal input
capacitance. Consequently the working input voltage and
the threshold level
U
ti
should be adequately above the
minimum input voltage
U
i min of the converter so that
enough energy is remaining in the input capacitance. If the
input voltage is below the required level, an external hold-
up capacitor (
C
i ext) should be added.
Formula for threshold level for desired value of
t
h:
2 •
P
o • (
t
h + 0.3 ms) • 100
U
ti = ––––––––––––––––––––– +
U
i min2
C
i min •
η
V output (V0, V2, V3):
Connector pin V is internally connected to the open collec-
tor of a NPN transistor. The emitter is connected to the
negative potential of output 1.
U
V ≤ 0.6 V (logic low) corre-
sponds to a monitored voltage level (
U
i and/or
U
o1) <
U
t.
The current
I
V through the open collector should not exceed
50 mA. The NPN output is not protected against external
overvoltages.
U
V should not exceed 80 V.
U
i,
U
o1 status V output,
U
V
U
i or
U
o1 <
U
tlow, L,
U
V ≤ 0.6 V at
I
V = 50 mA
U
i and
U
o1 >
U
t +
U
hhigh, H,
I
V ≤ 25 µA at
U
V = 5.1 V
20
23
5
Vo1+
Vo1–
V
U
V
I
V
Vi+
Vi–
29
32
R
p
voltage(s) e xceed(s)
U
t +
U
h. The threshold le vel
U
t is either
adjustable b y a potentiometer, accessible through a hole in
the front cover, or is factory adjusted to a deter mined cus-
tomer specified value.
Versions V0, V2 and V3 are available as shown below.
Option V operates independently of the built-in input under-
voltage lock-out circuit. A logic "low" signal is generated at
pin 5 as soon as one of the monitored voltages drops below
the preselected threshold le vel
U
t. The return for this signal
is Vo1– (pin 23). The V output recovers when the monitored
Table 21: Undervoltage monitor functions
V output Monitoring Minimum adjustment range Typical hysteresis
U
h [% of
U
t]
(VME compatible) of threshold level
U
tfor
U
t min...
U
t max
U
i
U
o1
U
ti
U
to
U
hi
U
ho
V2 yes no
U
i min...
U
i max 1– 3.0...0.5 -
V3 yes yes
U
i min...
U
i max 1 0.95...0.98
U
o1 2 3.0...0.5 "0"
V0 yes no
U
i min...
U
i max 3 4 - 2.2...0.4 -
yes yes
U
i min...
U
i max 3 4 0.95...0.98
U
o1 2 2.2...0.4 "0"
1 Threshold level adjustable by potentiometer (not recommended for mobile applications). 2 Fixed value between 95% and 98% of
U
o1
(tracking), output undervoltage monitoring is not a requirement of VME standard. 3 Adjusted at
I
o nom.
4 Fixed value, resistor-adjusted (±2% at 25°C) acc. to customer's specifications; individual type n umber is determined by Melcher.
Table 20: Available internal input capacitance and factory potentiometer setting of U
t i
with resulting hold-up time
Types AM BM FM CM/CMZ DM/DMZ EM LM/LMZ Unit
C
i min 2.6 0.67 0.37 0.37 0.14 0.14 0.14 mF
U
t i 9.5 19.5 39 39 61 104 120 V DC
t
h0.34 0.69 2.92 1.92 1.73 6.69 8.18 ms
Fig. 21
Output configuration of options V0, V2 and V3
Formula for additional external input capacitor
2 •
P
o • (
t
h + 0.3 ms) • 100
C
i ext = ––––––––––––––––––––– –
C
i min
η
• (
U
ti 2 –
U
i min2)
where as:
C
i min = minimum internal input capacitance [mF], accord-
ing to the table below
C
i ext = external input capacitance [mF]
P
o= output power [W]
η
= efficiency [%]
t
h= hold-up time [ms]
U
i min = minimum input voltage [V]
U
ti = threshold level [V]
Remarks: The threshold level
U
ti of option V2 and V3 is ad-
justed during manufacture to a value according to the table
below. A decoupling diode should be connected in series
with the input of A...D/FM converters to avoid the input ca-
pacitance discharging through other loads connected to the
same source voltage. If LM or LMZ units are AC powered,
an external input capacitor cannot be applied unless an ad-
ditional rectifier is provided.
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Edition 2/96 - © Melcher AG 7 - 21
MELCHER
The Power Partners.
7.1
3
5.1 V
4.875 V
0
U
i [V DC]
0
t
t
U
ti +
U
hi
U
ti
Input voltage failure Switch-on cycle Input voltage sag Switch-on cycle and subsequent
input voltage failure
U
V high
U
V low
U
V
0
V2
t
U
o1
0
U
V high
U
V low
U
V
0
V2
U
i
U
ti
4
Output voltage failure
0
U
V high
U
V low
U
V
3
U
ti +
U
hi
t
low min 2
t
low min 2
t
low min 2
33
4
4
U
V high
U
V low
U
V
0
V3
t
3
t
low min 2
t
low min 2
33
t
h 1
2.0 V
t
h 1
4
3
4
t
low min 2
V3
5.1 V
4.875 V
0
U
o1
2.0 V
Input voltage monitoring
Output voltage monitoring
Threshold tolerances and hysteresis:
If
U
i is monitored, the internal input voltage is measured af-
ter the input filter and rectifier (E/LM and LMZ types). Con-
sequently this voltage differs from the voltage at the con-
nector pins by the voltage drop ∆
U
t i across input filter and
rectifier. The threshold le vel of option V0 is factory adjusted
at
I
o nom and
T
A = 25°C . The value of ∆
U
t i depends upon the
input voltage range (AM, BM, ...), threshold level
U
ti, tem-
per ature and input current. The input current is a function of
input voltage and output power.
Fig. 23
Relationship between U
i
, U
o1
, U
V
, I
V
and U
o1
/U
o nom
versus time.
1VME request: minimum 4 ms
2
t
low min = 40...200 ms, typically 80 ms
3
U
V level not defined at
U
o1 < 2.0 V
4The V signal drops simultaneously with the output voltage, if the
pull-up resistor
R
P is connected to Vo1+. The V signal remains
high if
R
P is connected to an external source.
∆
U
ti
U
hi
U
V
low
U
V
U
V high
U
i
P
o
=
P
o nom
P
o
= 0
P
o
= 0
U
ti
P
o
=
P
o nom
Fig. 22
Definition of U
ti
,
∆
U
ti
and U
hi
M-Family DC-DC Converters <100 W Rugged Environment
7 - 22 Edition 2/96 - © Melcher AG
MELCHER
The Power Partners.
7.1
Option F Fuse not accessible
The standard M units have a fuseholder containing a 5 × 20
mm fuse which is externally accessible and to be found in
the back plate near the connector. Some applications re-
quire an inaccessible fuse. Option F provides a fuse
mounted directly onto the main PCB inside the case.
The full self-protecting functions of the module do normally
not lead to broken fuses, except as a result of inverse polar-
ity at the input of an A/B/C/D/FM or C/DMZ type or if a
power component inside fails (switching transistor, free-
wheeling diode, etc). In such cases the defective unit has to
be returned to Melcher for repair.
Option U UL Version
Underwriters Laboratories (UL) have approved the M se-
ries converters as recognized components up to an ambi-
ent temperature of
T
A max – 15 K given by the upper tem-
perature limit of the standard PCB material. If the full maxi-
mum ambient temperature
T
A max is required with UL ap-
proval, option U should be requested. It consists of an alter-
native PCB material with a higher maximum temperature
specification.
The European approval boards have in contrast accepted
the converters with the standard PCB material to be ope-
rated up to
T
A max without any further precautions.
Immunity to Environmental Conditions
Table 22: Mechanical stress
Test Method Standard Test Conditions
Ca Damp heat DIN 40046 part Temperature: 40 ±2 °C
steady state IEC 68-2-3 Relative humidity: 93 +2/-3 %
MIL-STD-810D section 507.2 Duration: 56 days
Unit not operating
Ea Shock DIN 40046 part 7 Acceleration amplitude: 100 gn = 981 m/s2
(half-sinusoidal) IEC 68-2-27 Bump duration: 6 ms
MIL-STD-810D section 516.3 Number of bumps: 18 (3 each direction)
Unit operating
Eb Continuous shock DIN 40046 part 26 Acceleration amplitude: 40 gn = 392 m/s2
(half-sinusoidal) IEC 68-2-29 Bump duration: 6 ms
MIL-STD-810D section 516.3 Number of bumps: 6000 (1000 each direction)
Unit operating
Fc Vibration DIN 40046 part 8 Frequency (1 Oct/min): 10...2000 Hz
(sinusoidal) IEC 68-2-6 Maximum vibration amplitude: 0.35 mm (10...60 Hz)
MIL-STD-810D section 514.3 Acceleration amplitude: 5 gn = 49 m/s2
Test duration: 7.5 h (2.5 h each axis)
Unit operating
Fda Random vibration DIN 40046 part 23 Acceleration spectral density: 0.05 g2/Hz
wide band IEC 68-2-35 Frequency band: 20...500 Hz
reproducibility high Acceleration magnitude: 4.9 grms
Test duration: 3 h (1 h each axis)
Unit not operating
Kb Salt mist DIN 40046 part 105 Concentration: 5% (30°C)
cyclic IEC 68-2-52 Duration: 2 h per cycle
(sodium chloride NaCl Storage: 40°C, 93% rel. humidity
solution) Storage duration: 22 h per cycle
Number of cycles: 3
Unit not operating
Rugged Environment DC-DC Converters <100 W M-Family
Edition 2/96 - © Melcher AG 7 - 23
MELCHER
The Power Partners.
7.1
Thermal considerations
Table 23: Temperature specifications, values given are for an air pressure of 800...1200 hPa (800...1200 mbar)
Characteristic min max Unit
T
AStandard operational ambient temperature range -7, (MIL-STD-810D sections 501.2 and 502.2) –25 71 °C
T
AExtended operational ambient temperature range -9, (MIL-STD-810D sections 501.2 and 502.2) –40 71
T
CStandard operational case temperature range -7, overtemp. lock-out (PTC) at
T
C > 95°C –25 95
T
CExtended operational case temperature range -9, overtemp. lock-out (PTC) at
T
C > 95°C –40 95
T
SStorage temperature range -7, (MIL-STD-810D sections 501.2 and 502.2) –40 100
T
SExtended storage temperature range -9, (MIL-STD-810D sections 501.2 and 502.2) –55 100
Table 24: MTBF
Values at specified Module Types Ground Benign Ground Fixed Ground Mobile Unit
Case Temperature 40°C40°C70°C50°C
MTBF 1 A...LM 1000 and C/D/LMZ 1000 320'000 130'000 40'000 35'000 h
A...LM 2000 and C/D/LMZ 2000 255'000 105'000 32'000 28'000
A...LM 3000 and C/D/LMZ 3000 225'000 80'000 28'000 25'000
Device hours 2 A...LM 1000 and C/D/LMZ 1000 880'000
A...LM 2000 and C/D/LMZ 2000 720'000
A...LM 3000 and C/D/LMZ 3000 740'000
1Calculated in accordance with MIL-HDBK-217E (calculation according to edition F would show even better results)
2Statistical values, based on an average of 4300 working hours per year and in general field use, over 3 years
Basically the available output power is limited by thermal
characteristics. Customer specific applications requiring
slightly higher output power, i.e. increased voltages or cur-
rents, are available on request. Usually the maximum ambi-
ent and case temperatures are reduced compared with
standard types. Operation at higher temperatures with
nominal output currents is also possible if forced cooling
can be provided (heat sink, fan, etc.).
Example: Sufficient forced cooling allows
T
A max = 85°C. A
simple check of the case temperature
T
C (
T
C ≤ 95°C) at full
load ensures correct operation of the system (temperature
measurement point on the case see "Mechanical Data").
In general: For an ambient temperature of 85°C with only
convection cooling, the maximum permissible current for
each output is approx. 50 % of it's nominal value for -7 or
-9 units as per figure.
0
10
20
30
40
50
60
70
80
T
A min
50 60 70 80 90 100
I
o nom
[%]
T
A
[°C]
90
100
110
T
C max
I
o nom
each output
(convection cooling)
I
o nom
(forced cooling)
Fig. 24
Output derating versus ambient temperature under con-
vection and forced cooling conditions
M-Family DC-DC Converters <100 W Rugged Environment
7 - 24 Edition 2/96 - © Melcher AG
MELCHER
The Power Partners.
7.1
Mechanical Data
Dimensions in mm. Tolerances ±0.3 mm unless otherwise indicated.
Fig. 25
Case M02, weight 770 g (approx.)
111.2
±0.8
88
(11.6)
168.5
±0.5
127
171.93 (DIN 41494)
20
100
±0.6
1.6
6TE
2
5
8
11
14
17
20
23
26
29
32
Male connector H 11 according to DIN 41 612
(Gold plated contacts on customer's request)
38.7
95
±0.5
Measurement point for
case temperature
T
C
M 3; depth = 4 mm
(chassis mount)
22
68
159.4
Mounting plane of
connector H11
5.08
10.16
15.24
20.32
25.40
30.48
2TE
7.09
17.25
28.6
34
15
4
Mounting holes for retaining clips V
12.17
103
3.27
20.5 12.1
94.5
±0.1
0
31.5
±0.1
0
ø 3.5
ø 4.0
I
oL
(LED red)
Test sockets (option A)
Potentiometer(s) (option P)
OK (LED green)
Inhibit i (LED red)
Potentiometer (option D)
or potentiometer (option V)
Front plate
Main face Rear face
Back plate
22.30
European
Projection
Note: Long case, elongated by 60 mm for 220 mm rack
depth, is available on request.
Rugged Environment DC-DC Converters <100 W M-Family
Edition 2/96 - © Melcher AG 7 - 25
MELCHER
The Power Partners.
7.1
Type Key and Product Marking
Type Key C M Z 2 5 40 -7 E R P D V A H F U
Input voltage range
U
i: 8...35 V DC ...............A
14...70 V DC ...............B
20...100 V DC ............... F
28...140 V DC .............. C
44...220 V DC .............. D
67...385 V DC ...............E1
85...264 V AC, 88...372 V DC .............. L
Family .............. M
Class II Equipment ............... Z
Blank .................
Number of outputs .......... 1...3
Output 1,
U
o1 nom: 5.1 V .......... 0...2
12 V ............... 3
15 V .......... 4...5
24 V ............... 6
other voltages .......... 7...8
48 V ............... 9
other specs for single output modules ...... 01...99
Output 2 and 3,
U
o2 nom,
U
o3 nom: 5.1 V ...... 01...19
12 V ...... 20...39
15 V ...... 40...59
24 V ...... 60...69
other voltages for multiple output modules ...... 70...99
Ambient temperature range
T
A: –25…71°C .............. -7
(operational) –40…71°C .............. -9
customer specific ........-0...-6
Output voltage control input (single output modules only) R2
Options:
Inrush current limitation (C/E/LM and C/LMZ only) .........E
Potentiometers for fine adjustment of output voltages.....P2
Save data signal (D0...D9, to be specified)..................... D3
ACFAIL signal (V0, V2, V3, to be specified) ....................V3
Output voltage test sockets..............................................A
Increased electric strength test voltage (O/C)................. H
Input fuse built-in (not accessible) ...................................F
UL recognized component for
T
A max ............................... U
1EM types upon custom specifications available
2Feature R excludes option P and vice versa
3Option D excludes option V and vice versa
Example: CM 2540-7PD3A: DC-DC converter, input voltage range 28...140 V, providing output 1 with 15 V/1.7 A and
output 2 with 15 V/1.7 A; equipped with potentiometers, undervoltage monitor and test sockets.
Product Marking (refer also to "Mechanical Data")
Main face: Basic type designation, applicable safety approval and recognition marks, warnings, pin allocation, Melcher
patents and company logo.
Front plate: Identification of LEDs, optional test sockets and potentiometers.
Back plate: Specific type designation, input voltage range, nominal output voltage(s) and current(s), pin allocation of op-
tions and auxiliary functions, fuse specification and degree of protection.
Rear face: Label with batch no., serial no. and data code comprising production site, modification status of the main
PCB, date of production. Confirmation of successfully passed final test.
Accessories: Front panels, female connectors, mounting facilities, etc. please refer to section "Accessories".
