JAHW075Y1 - Tyco Electronics - Datasheet.Directory

Data Sheet

March 2005

JAHW050Y, JAHW075Y, and JAHW100Y Power Modules:

dc-dc Converter s; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

Applications

■Distributed power architectures

■Communications eq uipment

■Computer equipment

Options

■Heat sinks available for extended operation

■Choice of remote on/off logic configuration

Features

■Small size: 61.0 mm x 57.9 mm x 12.7 mm

(2.40 in. x 2.28 in. x 0.50 in.)

■High power density

■Very high efficiency: 88% typical

■Low output noise

■Constant frequency

■Industry-standard pinout

■Metal baseplate

■2:1 input voltage range

■Overtemperature protection

■Overcurrent protection

■Output ov ervoltage protection

■Remote sense

■Remote on/off

■Adjustable output voltage

■Case ground pin

■Auto-restart after overcurrent shutdown

■ISO* 9001 Certified manufacturing facilities

■UL†60950 Recognized, CSA‡ C22.2 No . 60950 -00

Certified, and VDE § 0805 (IEC60950) Licensed

■CE mark meets 73/23/EEC and 93/68/ EEC direc-

tives**

The JAHW Series Power Modules use advanced, surface-

mount technology and deliver high-quality, efficient, and

compact dc-dc conversion.

Description

The JAHW050Y, JAHW075Y, an d JAHW100Y Power Mo dules are dc-dc con verters that oper ate over an input

voltage range of 36 Vdc to 75 Vdc and provide a precisely regulated dc output. The outputs are fully isolated

from the inputs, allowing versatile polarity configur ations and grounding connections. The modules have maxi-

mum power ratings from 18 W to 36 W at a typical full-load efficien cy of 88%.

The sealed modules offer a metal baseplate for excellent thermal performance. Threaded-through holes are

provided to allow easy mounting or addition of a heat sink for high-temperatur e applications. The standard fea-

ture set includes remote sensing, output trim, and remote on/off for convenient flexibility in distributed power

applications.

* ISO is a registered trademark of the International Organization for Standardization.

† UL is a registered trademark of Underwriters Laboratories, Inc.

‡ CSA is a registered trademark of Canadian Standards Aisne.

§ VDE is a trademark of Verband Deutscher Elektrotechniker e.V.

** This product is intended for integ ration into end-use equipment. All the required procedures for CE marking of end-use equipment should

be followed. (The CE mark is placed on selected products.)

2Tyco Electronics Corp.

Data Sheet

March 2005

dc-dc Con verters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

JAHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Absolute Maximum Ratings

Stresses in excess of the absolute maximum ratings can cause permanent damage to the d evice. Th ese are abso-

lute stress ratings only. Functional operation of the de vice is not implied at these or any other conditions in excess

of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for ex tended

periods can adversely affect device reliability.

Electrical Specifications

Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature

conditions.

Table 1. Input Specifications

Fusing Considerations

CAUTION: This power module is not internally fused. An input line fuse must always be used.

This encapsulated power module can be used in a wide variety of applications, ranging from simple stand-alone

operation to an integrated part of a sophisticated power architecture. To preserve maxim um flexibility, internal fus-

ing is not included; ho w ever, to achieve maxim um safety and system protection, alw ays use an input line fuse. The

safety agencies require a normal-blow fuse with a maximum rating of 6 A (see Safet y Considerations section).

Based on the information provided in this da ta sheet on inrush energy and maximum dc input current, the same

type of fuse with a lower r ating can be used. Refer to the fuse manufacturer’s data for further information.

Parameter Symbol Min Max Unit

Input Voltage:

Continuous

Transient (100 ms) VI

VI, trans —

—80

100 Vdc

Operating Case Temperature

(See Thermal Considerations section.) TC–40 100 °C

Storage Temperature Tstg –55 125 °C

I/O Isolation Voltage (for 1 minute) — — 1500 Vdc

Parameter Symbol Min Typ Max Unit

Operat ing Input Voltage VI36 48 75 Vdc

Maximu m Input Current

(VI = 0 V to 75 V; IO = IO, max):

JAHW050Y (See Figure 1.)

JAHW075Y (See Figure 2.)

JAHW100Y (See Figure 3.)

II, max

—

0.9

1.3

1.7

Inrush Transient i2t——1.0A

Input Reflec te d- ripple Cu rr en t, Peak-to-peak

(5 Hz to 20 MHz, 12 µH source impedance;

see Figure 17.)

II —5—mAp-p

Input Ripple Rejection (120 Hz) — — 60 — dB

Tyco Electronics Corp. 3

Data Sheet

March 2005 dc-dc Converters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

J AHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Electrical Specifications (continued)

Table 2. Output Specifications

* Consult your sales representative or the factory.

† These are typical test results. In some situations, actual numbers may differ.

Table 3. Isolation Specifications

Parameter Device Symbol Min Typ Max Unit

Output Voltage Set Point

(VI = 48 V; IO = IO, max; TC = 25 °C) All VO, set 1.76 1.8 1.84 Vdc

Output Voltage

(Over all operating input voltage , static resistive

load, and temperature conditions until end of

life. See Figure 19.)

All VO1.7 — 1.9 Vdc

Output Regulation:

Line (VI = 36 V to 75 V)

Load (IO = IO, min to IO, max)

Temperature (TC = –40 °C to +100 °C)

All

—

0.01

0.05

0.1

0.2

%VO

Output Ripple and Noise Voltage

(See Figure 18.):

RMS

Peak-to-peak (5 Hz to 20 MHz) All

All —

——

—50

100 mVrms

mVp-p

External Load Capacitance All — 0 — *µF

Output Current

(At IO < IO, min, the modules may exceed output

ripple specifications.)

JAHW050Y

JAHW075Y

JAHW100Y

0.5

—

Output Current-limit Inception

(VO = 90% of VO, nom)JAHW050Y

JAHW075Y

JAHW100Y

IO, cli

—

15†

20†

26†

—

Output Short-circuit Current (VO = 250 mV) All — — 120 — %IO, max

Efficiency (VI = 48 V; IO = IO, max; TC = 70 °C) JAHW050Y

JAHW075Y

JAHW100Y

—

88.4

—

Switching Frequency All — — 230 — kHz

Dynamic Response

(∆IO/∆t = 1 A/10 µs, VI = 48 V, TC = 25 °C; tested

with a 10 µF aluminum and a 1.0 µF tantalum

capacitor across the load .):

Load Change fr om IO = 50% to 75% of IO, max:

Peak Deviation

Settling Time (VO < 10% of peak de viation)

Load Change fr om IO = 50% to 25% of IO, max:

Peak Deviation

Settling Time (VO < 10% of peak de viation)

All

—

200

—

µs

Parameter Min Typ Max Unit

Isolation Capacitance — 2500 — pF

Isolation Resistance 10 — — MΩ

4Tyco Electronics Corp.

Data Sheet

March 2005

dc-dc Con verters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

JAHW050Y, JAHW075Y, and JAHW100Y Power Modules:

General Specifications

Feature Specifications

Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature

conditions. See Feature Descriptions for additional information.

Table 4. Feature Specif ications

* These are typical test results. In some situations, actual numbers may differ.

Solder, Cleaning, and Drying Considerations

Post solder clea ning is usually th e final circu it-boar d assembly process prior to electrical testing. The result o f inad-

equate circuit-board cleaning and drying can affect both the reliability of a po wer module and the testability of the

finished circuit-board assembly. For guidance on appropriate soldering, cleaning, and drying procedures, refer to

the Board-Mounted Power Modules Soldering and Cleaning Application Note (AP97-021EPS).

Parameter Min Typ Max Unit

Calculated MTBF (IO = 80% of I O, max; TC = 40 °C) 3,000,000 hours

Weight — — 100 (3.5) g (oz.)

Parameter Symbol Min Typ Max Unit

Remote On/Off Signal Interface

(VI = 0 V to 75 V; open collector or equivalent compatible;

signal referenced to VI(–) terminal; see Figure 20 and

Feature Descriptions.):

JAHWxxxY1 Preferred Logic:

Logic Low—Module On

Logic High—Module Off

JAHWxxxY Optional Logic:

Logic Low—Module Off

Logic High—Module On

Logic Low:

At Ion/off = 1.0 mA

At Von/off = 0.0 V

Logic High:

At Ion/off = 0.0 µA

Leakage Current

Turn-on Time (See Figure 16.)

(IO = 80% of IO, max; VO within ±1% of steady state)

Von/off

Ion/off

Von/off

Ion/off

—

1.2

1.0

µA

Output Voltage Adjustment (See Feature Descriptions.):

Output Voltage Remote-sense Range

Output Voltage Set-point Adjustment Range (trim) —

——

60 —

—0.5

110 V

%VO, nom

Output Overvoltage Protection VO, sd 2.1 2.4* 4.0 V

Overtemperature Protection

(See Feature Descriptions.) TC—110— °C

Data Sheet

March 2005

Tyco Electronics Corp. 5

dc-dc Converters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

J AHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Characteristic Curves

The following f igures provide typical characteristics for the power modules. The figures are identical for both on/off

configurations.

8-3236 (F)

Figure 1. Typical JAHW050Y Input Characteristics

at Room Temperature

8-3237 (F)

Figure 2. Typical JAHW075Y Input Characteristics

at Room Temperature

8-3238 (F)

Figure 3. Typical JAHW100Y Input Characteristics

at Room Temperature

8-3239 (F)

Figure 4. Typical JAHW050Y Converter Efficiency

vs. Output Current at Room Temperature

0.8

0INPUT VOLTAGE, VI (V)

INPUT CURRENT, II (A)

10 20 30 40 50 60 70 80

IO = 10 A

IO = 5 A

IO = 0 A

0.7

0.6

0.5

0.4

0.3

0.2

0.1

1.2

INPUT VOLTAGE, VI (V)

INPUT CURRENT, II (A)

10 20 30 40 50 60 70 80

IO = 15 A

IO = 7.5 A

IO = 0 A

0.8

0.6

0.4

0.2

1.6

0INPUT VOL T AG E , VI (V)

INPUT CURRENT, II (A)

10 20 30 40 50 60 70 80

IO = 20 A

IO = 10 A

IO = 0 A

1.4

1.2

0.8

0.6

0.4

0.2

0OUTPUT CURRENT, IO (A)

EFFICIENCY, η (%)

12345678

60 910

VI = 75 V

VI = 48 V

VI = 36 V

6Tyco Electronics Corp.

Data Sheet

March 2005

dc-dc Converters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

JAHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Characteristic Curves (continued)

8-3240 (F)

Figure 5. Typical JAHW075Y Converter Efficiency

vs. Output Current at Room Temperature

8-3241 (F)

Figure 6. Typical JAHW100Y Converter Efficiency

vs. Output Current at Room Temperature

8-3242 (F)

Note: See Figure 18 for test conditions.

Figure 7. T ypical J AHW050Y Output Ripple Voltage

at Room Temperature and IO = IO, max

8-3243 (F)

Note: See Figure 18 for test conditions.

Figure 8. T ypical J AHW075Y Output Ripple Voltage

at Room Temperature and IO = IO, max

0OUTPUT CURRENT, IO (A)

EFFICIENCY, η (%)

2 4 6 8 10 12 14 16

VI = 75 V

VI = 48 V

VI = 36 V

0OUTPUT CURRENT, IO (A)

EFFICIENCY, η (%)

2 4 6 8 10 12 14 16

60 18 20

VI = 75 V

VI = 48 V

VI = 36 V

OUTPUT VOLTAGE, VO (V)

(10 mV/div)

TIME, t (2 µs/div)

VI = 36 V

VI = 48 V

VI = 75 V

OUTPUT VOLTAGE, VO (V)

(10 mV/div)

TIME, t (2 µs/div)

VI = 36 V

VI = 48 V

VI = 75 V

Data Sheet

March 2005

Tyco Electronics Corp. 7

dc-dc Converters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

J AHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Characteristic Curves (continued)

8-3244 (F)

Note: See Figure 18 for test conditions.

Figure 9.Typical JAHW100Y Output Ripple Voltage

at Room Temperature and

IO = IO, max

8-3173 (F)

Note: Tested with a 10 µF aluminum and a 1.0 µF tantalum capacitor

across the load.

Figure 10. Typical JAHW050Y Transient Response

to Step Decrease in Load from 50% to

25% of Full Load at Room Temperature

and 48 Vdc Input (Waveform Averaged to

Eliminate Ripple Component.)

8-3174 (F)

Note: Tested with a 10 µF aluminum and a 1.0 µF tantalum capacitor

across the load.

Figure 11. Typical JAHW075Y Transient Response

to Step Decrease in Load from 50% to

25% of Full Load at Room Temperature

and 48 Vdc Input (W aveform Averaged to

Eliminate Ripple Component.)

8-3175 (F)

Note: Tested with a 10 µF aluminum and a 1.0 µF tantalum capacitor

across the load.

Figure 12. Typical JAHW100Y Transient Response

to Step Decrease in Load from 50% to

25% of Full Load at Room Temperature

and 48 Vdc Input (W aveform Averaged to

Eliminate Ripple Component.)

OUTPUT VOLTAGE, VO (V)

(10 mV/div)

TIME, t (2 µs/div)

VI = 36 V

VI = 48 V

VI = 75 V

OUTPUT VOLTAGE, VO (V)

(100 mV/div)

TIME, t (100 µs/div)

OUTPUT CURRENT, IO (A)

(5 A/div)

OUTPUT VOLTAGE, VO (V)

(100 mV/div)

TIME, t (100 µs/div)

OUTPUT CURRENT, IO (A)

(7.5 A/div)

OUTPUT VOLTA GE , V

(V)

(100 mV/div)

TIME, t (100

s/div)

OUTPUT CURRENT, I

(A)

(5 A/div)

88 Tyco Electronics Corp.

Data Sheet

March 2005

dc-dc Con verters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

JAHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Characteristic Curves (continued)

8-3176 (F)

Note: Tested with a 10 µF aluminum and a 1.0 µF tantalum capacitor

across the load.

Figure 13. Typical JAHW050Y Transient Response

to Step Increase in Load from 50% to

75% of Full Load at Room Temperature

and 48 Vdc Input (Waveform Averaged to

Eliminate Ripple Component.)

8-3177 (F)

Note: Tested with a 10 µF aluminum and a 1.0 µF tantalum capacitor

across the load.

Figure 14. Typical JAHW075Y Transient Response

to Step Increase in Load from 50% to

75% of Full Load at Room Temperature

and 48 Vdc Input (Waveform Averaged to

Eliminate Ripple Component.)

8-3178 (F)

Note: Tested with a 10 µF aluminum and a 1.0 µF tantalum capacitor

across the load.

Figure 15. Typical JAHW100Y Transient Response

to Step Increase in Load from 50% to

75% of Full Load at Room Temperature

and 48 Vdc Input (W aveform Averaged to

Eliminate Ripple Component.)

8-3245 (F)

Note: Tested with a 10 µF aluminum and a 1.0 µF tantalum capacitor

across the load.

Figure 16. JAHW075Y Typical Start-Up from

Remote On/Off; IO = IO, max

OUTPUT VOLTAGE, VO (V)

(100 mV/div)

TIME, t (100 µs/div)

OUTPUT CURRENT, IO (A)

(5 A/div)

OUTPUT VOLTAGE, VO (V)

(100 mV/div)

TIME, t (100 µs/div)

OUTPUT CURRENT, IO (A)

(11.25 A/div)

OUTPUT VOLTAGE, VO (V)

(100 mV/div) VO (V)

TIME, t (100 µs/div)

OUTPUT CURRENT, IO (A)

(5 A/div)

REMOTE ON/OFF,

VON/OFF (V)

TIME, t (2 ms/div)

OUTPUT VOLTAGE, VO (V)

(1 mV/div)

Tyco Electronics Corp. 9

Data Sheet

March 2005 dc-dc Converters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

J AHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Test Configurations

8-203 (F).l

Note: Measure input reflected-ripple current with a simulated source

inductance (LTEST) of 12 µH. Capacitor CS offsets possible bat-

tery impedance. Measure current as shown above.

Figure 17. Input Reflected-Ripple Test Setup

8-513 (F).d

Note: Use a 1.0 µF ceramic capacitor and a 10 µF aluminum or tan-

talum capacitor. Scope measurement should be made using a

BNC socket. Position the load between 51 mm and 76 mm

(2 in. and 3 in.) from the module.

Figure 18. Peak-to-Peak Output Noise

Measurement Test Setup

8-749 (F)

Note: All measurements are taken at the module terminals. When

socketing, place Kelvin connections at module terminals to

avoid measurement errors due to socket contact resistance.

Figure 19. Output Voltage and Efficiency

Measurement Test Setup

Design Considerations

Input Sour ce Impedance

The power module should be connected to a low

ac-impedance input source. Highly inductive source

impedances can affect the stability of the power mod-

ule. For the test configuration in Figure 17, a 33 µF

electrolytic capacitor (ESR < 0.7 Ω at 100 kHz)

mounted close to the power module helps ensure sta-

bility of the unit. For other highly inductiv e source

impedances, consult the factory fo r further application

guidelines.

Safety Considerations

For safety-agency approval of the system in which the

power module is used, the power module must be

installed in compliance wit h the spacing and separat ion

requirements of the end-use safety agency standard,

i.e., UL60950, CSA C22.2 No. 60950-00, and VDE

0805 (IEC60950).

If the input source is non-SELV (ELV or a hazardous

voltage greater th an 60 Vdc and less than or equal to

75 Vdc), for the module’s output to be considered

meeting the requirements of safety e xtra-low voltage

(SELV), all of the following must be true:

■The input source is to be provided with reinforced

insulation from any hazardous v oltages, including the

ac mains.

■One VI pin and one VO pin are to be grounded, or

both the input and output pins are to be kept floating.

■The input pins of th e module are not operator acces-

sible.

■Another SELV reliability test is conducted on the

whole system, as requir ed by the saf ety agencie s, on

the combination of supply source and the subject

module to verify that under a single fault, hazardous

voltages do not appear at the module’s output.

Note: Do not ground either of the input pins of the

module without grounding one of the output pins .

This may allow a non-SELV voltage to appear

between the output pin and ground.

The pow er modu le has e xt ra-lo w voltage ( ELV) outputs

when all inputs are ELV.

The input to these units is to be provided with a maxi-

mum 6 A normal-blow fuse in the ungrounded lead.

TO OSCILLOSCOPE

CURRENT

PROBE

BATTERY

LTEST

12 µH

CS 220 µF

ESR < 0.1 Ω

@ 20 °C, 100 kHz 33 µF

ESR < 0.7 Ω

@ 100 kHz

VI(+)

VI(–)

1.0 µFRESISTIVE

SCOPE

COPPER STRIP

10 µFLOAD

VO(+)

VO(–)

VI(+)

IIIO

SUPPLY

CONTACT

CONTACT AND

LOAD

SENSE(+)

VI(–)

VO(+)

VO(–)

SENSE(–)

RESISTANCE

DISTRIBUTION LOSSES

ηVO(+) – VO(–)[]IO

VI(+) – VI(–)[]II

------------------------------------------------





x 100 %=

1010 Tyco Electronics Corp.

Data Sheet

March 2005

dc-dc Con verters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

JAHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Feature Descriptions

Overcurrent Protection

To provide protection in an output overload condition,

the unit is provided with internal shutdown and auto-

restart mechanism.

At the instance of current-limit inception, the module

enters a "hiccup" mode of operation whereby it shuts

down and automatically attempts to restart. As long as

the fault pers ists, the mod ule rem a ins in this mo de.

The protecti on mechanism is such that the unit can

continue in this condition for a sufficient interval of time

until the fault is cleared.

Remote On/Off

Two remote on/off options are available. Positive logic

remote on/off turns the module on during a logic-high

voltage on the ON/OFF pin, and off during a logic low.

Negative logic remote on/off turns the module off dur-

ing a logic high and on during a logic low. Negative

logic, device code suffix “1,” is the factory-preferred

configuration.

To turn the power module on and off, the user must

supply a switch to control the voltage between the

on/off terminal and the VI(–) terminal (Von/off). The

switch can be an open collector or equivalent (see

Figure 20). A logic low is Von/off = 0 V to 1.2 V. The

maximum Ion/off during a logic low is 1 mA. The switch

should maintain a logic-low voltage while sinking 1 mA.

During a logic high, the maximum Von/off generated by

the power module is 15 V. The maximum allowable

leakage current of the switch at Von/off = 15 V is 50 µA.

If not using the remote on/ off feature, do one of the

following to turn the unit on:

■F or negativ e logic, short ON/OFF pin to VI(–).

■For positive logic, leave ON/OFF pin open.

8-720 (F).c

Figure 20. Remote On/ Off Implementation

Remote Sense

Remote sense minimizes the effects of distribution

losses by re gulating the voltage at the remote-sense

connections. The voltage between the remote-sense

pins and the output terminals must not exceed the out-

put voltage sense r ange gi ven in the Feature Specifica-

tions table, i.e .:

[VO(+) – VO(–)] – [SENSE(+) – SENSE(–)] ≤ 0.5 V

The voltage between the VO( +) and VO(–) terminals

must not exceed th e min i mum outp u t overvoltage shut-

down value indicated in the Feature Specifications

table. This limit includes any increase in v olt age du e to

remote-sense compensation and output voltage set-

point adjustment (trim). See Figure 21.

If not using the rem o te- se nse featur e to regulate the

output at the poin t of load, then connect SENSE(+) to

VO(+) and SENSE(–) to VO(–) at the module.

Although the out put voltage can be increased by both

the remote sense and by the trim, the maximum

increase for the output voltage is not the sum of both.

The maximum increase is the larger of either the

remote sense or the trim. Consult the factory if you

need to increase the output voltage more than the

above limitation.

The amount of power delivered b y the module is defined

as the v oltage at the output terminals multiplied b y the

output current. When using remote sense and trim, the

output v oltage of the module can be increased, which at

the same output current would increase the po wer output

of the module. Care should be tak en to ensure that the

maximum output po wer of the module remains at or

below the maximum r ated po w er.

SENSE(+)

VO(+)

SENSE(–)

VO(–)

VI(–)

–

Ion/off ON/OFF

VI(+)

LOAD

Von/off

Tyco Electronics Corp. 11

Data Sheet

March 2005 dc-dc Converters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

J AHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Feature Descriptions (continued)

Remote Sense (continued)

8-651 (F). m

Figure 21. Effective Circuit Configuration for

Single-Module Remote-Sense Operation

Output Voltage Set-Point Adjustment

(Trim)

Output voltage trim allows the user to increase or

decrease the output v oltage set point of a module. This is

accomplished by connecting an external resistor between

the TRIM pin and either the SENSE(+) or SENSE(–) pins.

The trim resistor should be positioned close to the mod-

ule.

If not using the trim feature, leave the TRIM pin open.

With an external resistor between the TRIM and

SENSE(–) pins (Radj-down), the output voltage set point

(VO, adj) decreases (see Figure 22). The follo wing equa-

tion determines the required external-resistor value to

obtain a percentage output voltage change of ∆%.

The test results for this configuration are displayed in

Figure 23. This figure applies to all output voltages.

With an external resistor connected betw ee n t he TRI M

and SENSE(+) pins (Radj-up), the output voltage set

point (VO, adj) increases (see Figure 24).

The following equation determines the required exter-

nal-resistor value to obtain a percentage output voltage

change of ∆%.

The voltage between the VO(+) and VO(–) terminals

must not exceed the minimum output overvoltage shut-

down value indicated in the Feature Specifications

table. This limit includes any increase in v olt age du e to

remote-sense compensation and output voltage set-

point adjustment (trim). See Figure 21.

Although the output volt age can be increased by both

the remote sense and by the trim, the maximum

increase for the output voltage is not the sum of both.

The maximum increase is the larger of either the

remote sense or the trim. Consult the factory if you

need to increase the out put voltag e more than the

above limitation.

The amount of power delivered by t he module is defined

as the v oltage at the output terminals multiplied b y the

output current. When using remote sense and trim, the

output voltage of the module can be increased, which at

the same output current would increase the po wer output

of the module. Care should be tak en to ensure that the

maximum output po wer of the module remains at or

below the maximum r ated po w er.

8-748 (F).b

Figure 22. Circuit Configuration to Decrease

Output Voltage

SENSE(+)

SENSE(–)

VI(+)

VI(–)

IOLOAD

CONTACT AND

SUPPLY II

CONTACT

VO(+)

VO(–)

DISTRIBUTION LOSSESRESISTANCE

Radj-down 1000

∆%

-------------11–





kΩ=

Radj-up VO nom,()1∆%

100

--------+()1.225–

1.225∆%

--------------------------------------------------------------------------1000 11

–







kΩ=

(+)

VI(–)

ON/OFF

CASE

VO(+)

VO(–)

SENSE(+)

TRIM

SENSE(–) Radj-down RLOAD

1212 Tyco Electronics Corp.

Data Sheet

March 2005

dc-dc Con verters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

JAHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Feature Descriptions (continued)

Output Voltage Set-Point Adjustment

(Trim) (continued)

8-2470 (F)

Figure 23. Resistor Selection for Decreased

Output Voltage

8-715 (F).b

Figure 24. Circuit Configuration to Increase

Output Voltage

Output Overvoltage Protection

The output overvoltage protection consists of circuitry

that monitors the voltage on the output terminals. If the

voltage on the output terminals exceeds the overvolt-

age protection threshold, the module will shut down

and restart automatically.

Overtemperature Protection

To provide protection in a fault condition, the unit is

equipped with an overtemperature circuit. In the event

of such a fault, the module enters into an auto-restart

“hiccup” mode with low output v oltage until the fault is

removed. Recovery from the o vertemperature protec-

tion is automatic aft er the unit cools belo w th e o vertem-

peratur e protection threshold.

Thermal Considerations

Introduction

The power modules operate in a variety of thermal

environments; however, sufficient cooling should be

provided to help ensure reliable operation of the unit.

Heat-dissipating components inside the unit are ther-

mally coupled to the case. Heat is removed by conduc-

tion, conv ection, and radiation to the surrounding

environment. Proper cooling can be verified by mea-

suring the case temperature. Peak temperature (TC)

occurs at the position indicated in Figure 25.

8-716 (F).h

Note: Top view, pin locations are for reference only. Measurements

shown in millimeters and (inches).

Figure 25. Case Temperature Measurement

Location

10 20 30 40

10k

100k

% CHANGE IN OUTPUT VOLTAGE (∆%)

ADJUSTMENT RESISTOR VALUE (Ω)

(+)

VI(–)

ON/OFF

CASE

VO(+)

VO(–)

SENSE(+)

TRIM

SENSE(–)

Radj-up RLOAD

MEASURE CASE

ON/OFF

CASE

+SEN

TRIM

–SEN

29.0

(1.14)

30.5

TEMPERATURE HERE

VO(+)

VO(–)

VI(+)

VI(–)

(1.20)

Tyco Electronics Corp. 13

Data Sheet

March 2005 dc-dc Converters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

J AHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Thermal Considerations (continued)

Introduction (continued)

The temperature at this location should not exceed

100 °C. The output power of the module should not

exceed the rated power for the module as listed in the

Order i n g In formation table.

Although the maximum case temperature of the power

modules is 100 °C, you can limit this temperature to a

lower value for extremely high reliability.

Heat Transfer Without Heat Sinks

Increasing airflow over the module enhances the heat

transfer via convection. Figure 26 shows the maximum

power that can be dissipated b y the module without

e xceeding the maximum case te mperature v ersus local

ambient temperature (TA) for natural convection

through 3 m/s (600 ft./min.).

Note that the natu ral convection condition was mea-

sured at 0.05 m/s to 0.1 m/s (10 ft./min. to 20 ft./min.);

however, systems in which these power modules may

be used typically generate natural convection airflow

rates of 0.3 m/s (60 ft./m in.) due to ot he r he at di ssip at -

ing components in the system. The use of Figure 26 is

shown in the following example.

Example

What is the minimum airflow necessary for a

JAHW100 Y operating at VI = 48 V, an output current of

20 A, and a maximum ambient temperature of 65 °C?

Solution

Given: VI = 48 V

IO = 20 A

TA = 65 °C

Determine P D (Use Figure 29.):

PD = 5.2 W

Determine airflow (v) (Use Figure 26.):

v = 0.46 m/s (90 ft./min.)

8-3246 (F)

Figure 26. Forced Convection Power Derating wit h

No Heat Sink; Either Orientation

8-3247 (F)

Figure 27. JAHW050Y Power Dissipation vs.

Output Current at 25 °C

0LOCAL AMBIENT TEMPERATURE, TA (°C)

POWER DISSIPATION, PD (W)

10 20 30 40 50 60 70 80

90100

3.0 m/s (600 ft./min.)

2.0 m/s (400 ft./min.)

1.0 m/s (200 ft./min.)

0.1 m/s (20 ft./min.)

(NATURAL CONVECTION)

4.5

0LOCAL AMBIENT TEMPERATURE, TA (°C)

POWER DISSIPATION, PD (W)

12345678910

3.5

2.5

1.5

0.5

VI = 75 V

VI = 48 V

VI = 36 V

1414 Tyco Electronics Corp.

Data Sheet

March 2005

dc-dc Con verters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

JAHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Thermal Considerations (continued)

Heat Transfer Without Heat Sinks (continued)

8-3248 (F)

Figure 28. JAHW075Y Power Dissipation vs.

Output Current at 25 °C

8- 3249 (C)

Figure 29. JAHW100Y Power Dissipation vs.

Output Current at 25 °C

Heat Transfer with Heat Sinks

The power modules have thr ough-threaded, M3 x 0.5

mounting holes , which enab le heat sinks or cold plate s

to attach to the module. The mo unting torque must not

exceed 0.56 N-m (5 in.-lb.).

Thermal derating with heat sinks is e xpressed b y using

the overall thermal resistance of the module. Total

module thermal resistance (θca) is defined as the max-

imum case temperature rise (∆TC, max) divided by the

module power dissipation (PD):

The location to measure case temperature ( TC) is

shown in Fig ure 25. Case-to-ambien t thermal resis-

tance vs. air flow is shown, for various heat sink config-

urations and heights, in Figure 30. These curves were

obtained by experimental testing of heat sinks, which

are offered in the product catalog.

8-3184 (F)

Figure 30. Case-to-Ambient Thermal Resistance

Curves; Either Orientation

These measured resistances are from heat tran sfer

from the sides and bo ttom of the modul e as w ell as t he

top side with the attached heat sink; theref ore, the

case-to-ambient thermal resistances shown are gener-

ally lower than the resistance of the heat sink by itself.

The module used to collect the data in Figure 30 had a

thermal-conductive dry pad between the case and the

heat sink to minimize contact resistance. The use of

Figure 30 is shown in the following example.

Example

If an 85 °C case temperature is desired, what is the

minimum airflow necessary? Assume the JAHW100Y

module is operating at VI = 48 V and an output current

of 20 A, maximum ambient air tempera ture of 65 °C,

and the heat sink is 1/ 4 inch.

4.5

0OUTPUT CURRENT, IO (A)

POWER DISSIPATION, PD (W)

2 4 6 8 10 12 14 16

3.5

2.5

1.5

0.5

VI = 75 V

VI = 48 V

VI = 36 V

0OUTPUT CURRENT, IO (A)

POWER DISSIPATION, PD (W)

2 4 6 8 10 12 14 16

18 20

VI = 75 V

VI = 48 V

VI = 36 V

θca ∆TCmax,

---------------------TCTA–()

------------------------

AIR VELOCITY, m/s (ft./min.)

CASE-TO-AMVIENT THERMAL

0.5 1.0 1.5 2.0 2.5 3.0

(100) (200) (300) (400) (500) (600)

RESISTANCE, θca (°C/W)

NO HEAT SINK

1/4 IN. HEAT SINK

1/2 IN. HEAT SINK

1 IN. HEAT SINK

Tyco Electronics Corp. 15

Data Sheet

March 2005 dc-dc Converters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

J AHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Thermal Considerations (continued)

Heat Transfer with Heat Sinks (continued)

Solution

Given: VI = 48 V

IO = 20 A

TA = 65 °C

TC = 85 °C

Heat sink = 1/4 inch.

Determine P D by using Figure 29:

PD = 5.2 W

Then solve the following equation:

Use Figure 30 to determine air velocity for the 1/4 inch

heat sink.

The minimum airflow necessary for the JAHW100Y

module is 0.91 m/s (180 ft./min.).

Custom Heat Sinks

A more detailed model can be used to determine the

required thermal resistance of a heat sink to provide

necessary cooling. The total module resistance can b e

separa ted into a resist ance from case-to-sink (θcs) and

sink-to-amb i en t (θsa) as shown in Fig ure 31.

8-1304 (F).e

Figure 31. Resistance from Case-to-Sink and

Sink-to-Ambient

For a managed interface using thermal grease or foils,

a value of θcs = 0.1 °C/W to 0.3 °C/W is typical. The

solution for heat sink resistance is:

This equation assumes that all dissipated pow er must

be shed by the heat sink. Depending on the user-

defined application environment, a more accurate

model, including heat transfer from the sides and bot-

tom of the module, can be used. This equation pro-

vides a conservative estimate for such instances.

EMC Considerations

For assistance with designing for EMC compliance,

please refer to the FLTR100V10 data sheet

(DS99-294EPS).

Layout Considerations

Copper paths must not be routed beneath the power

module mounting inserts. For additional layout guide-

lines, refer to the FLTR100V10 data sheet

(DS99-294EPS).

θca TCTA–()

------------------------

θca 85 65–()

5.2

------------------------

θca 3.85 °C/W=

PDTCTSTA

θcs θsa

θsa TCTA–()

-------------------------θcs–=

16 Tyco Electronics Corp.

Data Sheet

March 2005

dc-dc Con verters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

JAHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Outline Diagram

Dimensions are in millimeters and (inches).

Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.)

x.xx mm ± 0.25 mm (x.xxx in. ± 0.010 in.)

Top View

Side View

Bottom View

8-716 (F).m

* Side label includes Tyco name, product designation, safety agency markings, input/output voltage and current ratings, and bar code.

† The case pin is 5.4 (0.21). i.e., 1.3 (0.05) longer than the other pins.

57.9 (2.28)

61.0

(2.40)

SIDE LABEL*

0.51 (0.020)

12.7 (0.50)

1.02 (0.040) DIA

SOLDER-PLATED

BRASS, 7 PLACES

4.1 (0.16)†

2.06 (0.081) DIA

SOLDER-PLATED BRASS,

2 PLACES (– OUTPUT AND

+ OUTPUT)

48.3 (1.90)

10.16

(0.400)

MOUNTING INSERT S

M3 x 0.5 THROUGH,

4 PLACES

10.16

(0.400)

5.1 (0.20)

12.7 (0.50)

4.7

(0.19)

48.26 (1.900)

STANDOFF,

4 PLACES

7.1 (0.28)

7.1

(0.28)

17.78

(0.700)25.40

(1.000)35.56

(1.400)

25.40

(1.000)

50.8

(2.00)

35.56

(1.400)

VI(–)

CASE

ON/OFF

VI(+)

VO(–)

VO(+)

–SEN

TRIM

+SEN

Tyco Electronics Corp. 17

Data Sheet

March 2005 dc-dc Converters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

J AHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Recommended Hole Pattern

Component-side footprint.

Dimensions are in millimeters and (inches).

8-716 (F).m

Ordering Information

Table 5. Device Codes

Optional f eature s can be ordered using the suffix es sho wn in Table 6. Th e suffix es f ollo w the last lette r of the de vice

code and are placed in descending order. For example, the device codes for a JAHW075Y module with the follow-

ing options are shown below:

Positive logic JAHW075Y

Negative logic JAHW075Y1

Table 6. Device Options

Input

Voltage Output

Power Remote On/Off

Logic Device

Code Comcode

48 V 1.8 V 18 W Negative JAHW050Y1 TBD

48 V 1.8 V 27 W Negative JAHW075Y1 TBD

48 V 1.8 V 36 W Negative JAHW100Y1 108593682

48 V 1.8 V 18 W Positive JAHW050Y TBD

48 V 1.8 V 27 W Positive JAHW075Y TBD

48 V 1.8 V 36 W Positive JAHW100Y TBD

Option Suffix

Negative remote on/off logic 1

Positive remote on/off logic —

10.16

(0.400)

10.16

(0.400)

12.7 (0.50)

4.7

(0.19)

MODULE OUTLINE

5.1 (0.20)

48.26 (1.900)

TERMINALS

48.3 (1.90)

MOUNTING HOLES

57.9 (2.28)

50.8

(2.00) 25.40

(1.000)

35.56

(1.400)

61.0

(2.40)

35.56

(1.400)

25.40

(1.000)

17.78

(0.700)

TRIM

VI(+)

ON/OFF

CASE −SEN

+SEN

VO(+)

VI(−)VO(−)

1818 Tyco Electronics Corp.

Data Sheet

March 2005

dc-dc Con verters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

JAHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Ordering Information (continued)

Table 7. Device Accessories

Dimensions are in millimeters and (inches).

8-2832 (F)

Figure 32. Longitudinal Heat Sink

8-2833 (F)

Figure 33. Tran s ve rse Heat Sink

Accessory Comcode

1/4 in. transverse kit (heat sink, thermal pad, and screws) 407243989

1/4 in. longitudinal kit (heat sink, thermal pad, and screws) 407243997

1/2 in. transverse kit (heat sink, thermal pad, and screws) 407244706

1/2 in. longitudinal kit (heat sink, thermal pad, and screws) 407244714

1 in. transverse kit (heat sink, thermal pad, and screws) 407244722

1 in. longitudinal kit (hea t sink, thermal pad, and screws) 407244730

1/4 IN.

1/2 IN.

1 IN.

1 1/2 IN.

57.9

(2.4)

(2.28)

1/4 IN.

1/2 IN.

1 IN.

1 1/2 IN.

57.9

(2.28)

(2.4)

Tyco Electronics Corp. 19

Data Sheet

March 2005 dc-dc Converters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

J AHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Notes

Data Sheet

March 2005

dc-dc Converters; 36 to 75 Vdc Input, 1.8 Vdc Output; 18 W to 36 W

JAHW050Y, JAHW075Y, and JAHW100Y Power Modules:

Printed on

Recycled Paper

Tyco Electronics Power Systems, Inc.

3000 Skyline Drive, Mesquite, TX 75149, USA

+1-800-526-7819 FAX: +1-888-315-5182

(Outside U.S.A.: +1-972-284-2626, FAX: +1-972-284-2900)

http://power.tycoelectronics.com

Tyco Electronics Corporation reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application.

No rights under any patent accompany the sale of any such product(s) or information.

Printed in U.S.A.

March 2005

ADS01-046EPS (Replaces DS00-196EPS)