LUW025F6 - Tyco Electronics

Data Sheet

Novemb er 2001

LUW025-Series Power Modules: dc-dc Converters:

36 Vdc to 75 Vdc In; 3.3 Vdc and 5 Vdc Out; 16.5 W and 25 W

The LUW025-Series Power Modules use advanced, surface-

mount technol ogy and del iver hig h-qual ity, compact, dc-dc

conversion at an economical price.

Applications

■Computer applications

■Communications equipment

■Distributed power architectures

Options

■Choice of remote on/off logic

■Short pins

■Surface mountable

Features

■Low profile and small size:

50 mm x 50 mm x 8.5 mm

(1.969 in. x 1.969 in. x 0.335 in.)

■Fixed frequency

■Wide operating temperature range

■Remote on/off

■Wide voltage adjustment (trim)

■Output overcurrent protection

■Output overvoltage protection

■Overtemperature protection

■ISO*9001 and ISO14001 Certified manufacturing

facilities

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

Certified, VDE § 0805 (IEC60950) Licensed

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

directives**

*ISO is a registered trademark of the International Organization

f or Standardization.

†UL is a registered trademark of Underwri ters Laboratories, Inc.

‡CSA is a registered trademark of Canadian Standards Associa-

tion.

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

**This product is intended for integration into end-use equipment.

All the required procedures for CE marking of end-use equip-

ment should be fo llowed. (The CE mark is placed on selected

products.)

Description

The LUW025-Series Power Modules are low-profile, open-frame dc-dc converters that operate over an input

voltage range of 36 Vdc to 75 Vdc and provide a precisely regulated output. The output is isolated from the

input, allowing versatile polarity configurations and grounding connections. The modules feature remote on/off

and a wide range of output voltage adjustments. Built-in filtering for both input and output minimizes the need

for external filtering.

2Tyco Electronics Corp.

Data Sheet

November 2001

36 Vdc to 75 Vdc In; 3. 3 Vdc and 5 Vdc Out; 16.5 W and 25 W

LUW025-Series Power Modules: dc-dc Converters:

Absolute Maximum Ratings

Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-

lute stress ratings only. Functional operation of the device 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 extended

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 v ariety of applications, ranging from simple stand-alone

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

ing is not included; howe ver , to achie v e maximum safety and system protection, always use an input line fuse. The

safety agencies require a normal-blow fuse with a maximum rating of 5 A (see Safety Considerations section).

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

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

Parameter Symbol Min Typ Max Unit

Input Voltage:

Continuous

Transient (2 ms) VI

VI, trans 0

0—

—80

100 Vdc

Operating Temperature

(See Thermal Considerations section.) TA–40 — 75 °C

Storage Temperature Tstg –55 — 125 °C

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

Parameter Symbol Min Typ Max Unit

Operating Input Voltage VI36 48 75 Vdc

Maximum Input Current

(VI = 0 to 75 V; IO = I O, max; see Figures

1 and 2.)

II, max ——1.36A

Inrush Transient I2t——0.1

A2s

Input Reflected-ripple Current

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

see Figure 10.)

II—3—mAp-p

Input Ripple Rejection

(100 Hz—120 Hz) ——60—dB

EMC, EN55022

(Nominal i/p volts, IO = IO, m ax )(See EMC Considerations section.)

Tyco Electroni cs Corp. 3

Data Sheet

No vember 2001 36 Vdc to 75 Vdc In; 3.3 Vdc and 5 Vdc Out; 16.5 W and 25 W

LUW025-Series Power Modules: dc-dc Converters:

Electrical Specifications (continued)

Table 2. Output Specifications

Table 3. Isolation Specifications

Parameter Device

Suffix Symbol Min Typ Max Unit

Output Voltage Set Point

(VI = 48 V; IO = IO, max; Tref = 25 °C) F

AVO, set

VO, set 3.25

4.92 3.30

5.00 3.35

5.08 Vdc

Vdc

Output Voltage

(Over all operating input voltage, resistive

load, and temperature conditions until end of

life; see Figure 12.)

AVO

VO3.16

4.85 —

—3.44

5.15 Vdc

Vdc

Output Regu la tion :

Line (VI = 36 V to 75 V)

Load (IO = IO, min to IO, m ax)

Temperature

(Tref = –40 °C to +110 °C)

All

—

0.05

0.5

0.2

1.0

%VO

Output Ripple and Noise Voltage:

(VI = 48 V; IO = IO, max; temperature = –25 °C to

+100 °C; see Figure 11.):

RMS (5 Hz to 20 MHz bandwidth)

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

—

100

mVrms

mVp-p

External Load Capacitance

(total capacitance; electrolytic, tantalum, and

ceramic)

All — 0 — 470 µF

Output Curr ent

(At IO < IO, min, the modules may e xceed output

ripple specifications.)

All IO0.4 — 5.0 A

Output Cur rent- limi t Ince pti on

(VO = 90% of VO, nom)All IO, cli 5.15 — 7.5 A

Efficiency

(VI = 48 V ; IO = IO, max; T ref = 25 °C; se e Figur es

5, 6, and 12.):

VO = 3.3 V

Trimmed down to 1.8 V

VO = 5 V

Trimmed down to 3.3 V

—

Switching Frequency All — — 295 — kHz

Dyn ami c Res ponse

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

see Figures 7 and 8.):

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

Peak Deviation

Settling Time (VO < 10% of peak deviation)

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

Peak Deviation

Settling Time (VO < 10% of peak deviation)

All

—

Parameter Min Typ Max Unit

Isolation Capacitance — 2 — nF

Isolation Resistance (250 Vdc) 10 — — M¾

4Tyco Electronics Corp.

Data Sheet

November 2001

36 Vdc to 75 Vdc In; 3. 3 Vdc and 5 Vdc Out; 16.5 W and 25 W

LUW025-Series Power Modules: dc-dc Converters:

Electrical Specifications (continued)

Table 4. General Specifications

Table 5. Feature Spec ificat ion s

Solder Ball and Cleanliness Requirements

The open frame (no case or potting) power module will meet the solder ball requirements per J-STD-001B. These

requir e ment s st at e tha t solder b al ls mu st n eit her be lo ose no r viol at e t he power mo dule m ini m u m el ect rical sp aci ng .

The cleanliness designator of the open frame power module is C00 (per J specification).

Solder, Cleaning, and Drying Considerations

Post solder cleaning is usually the final circuit-board assemb ly process prior to electrical board testing. The result

of inadequate circuit-board cleaning and drying can affect both the reliability of a power 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 Ap plication Note

(AP97-021EPS).

Parameter Device

Suffix Min Typ Max Unit

Calculated MTBF

(IO = 80% of I O, max; TA = 20 °C) F

A8,500,000

5,000,000 hours

hours

W eight All — — 28 (1) g (oz.)

Parameter Device

Suffix Symbol Min Typ Max Unit

Remote On/Off Signal Interface

(VI = 0 V to 75 V; open collector or equiva-

lent compatible; signal referenced to VI(–)

terminal. See Feature Descriptions section

and Figure 13.):

Preferred Logic—Device Code Suffix “1”:

Logic Low—Module On

Logic High—Module Off

Optional Logic:

Logic Low—Module Off

Logic High—Module On

Logic Low:

At Ion/off = 1.0 mA

At Von/off = 0 V

Logic High:

At Ion/off = 0 µA

Leakage Current

Turn-on Time

(At 80% of IO, max ; VO within 10% of

steady sta t e; see Figur e 9.)

All

Von/off

Ion/off

Von/off

Ion/off

—

1.2

1.0

µA

Output Voltage Adjustment Range (trim) F

A—

—1.8

3.3 —

—3.45

5.25 V

Output Overvoltage Protection (clamp) F

AVO, clamp

VO, clamp 3.9

5.6 —

—5

Tyco Electroni cs Corp. 5

Data Sheet

No vember 2001 36 Vdc to 75 Vdc In; 3.3 Vdc and 5 V dc Out; 16.5 W and 2 5 W

LUW025-Series Power Modules: dc-dc Converters:

Characteristic Curves

8-2233

Figure 1. LUW025F Typical Input Characteristics

8-1982b

Figure 2. LUW025A Typical Input Characteristics

8-2234

Figure 3. LUW025F Typical Output Characteristics

8-1983

Figure 4. LUW025A Typical Output Characteristics

10 20 30 40 50 60

0.0

INPUT V OLTAGE, V

(V)

0.8

INPUT CURRENT, I

(A)

800

0.5

0.2

0.4

0.3

0.1

= 5A

= 2.5A

= 0.4A

0.6

0.7

10 20 30 40 50 60

0.0

INPUT V OLTAGE, VI (V)

0.8

0.6

INPUT CURRENT, II (A)

1.2

800

0.4

0.2

1.0

IO = 2.5 A

IO = 5 A

IO = 0.4 A

123456

0.0

OUTPUT CURRENT, IO (A)

3.5

OUTPUT VOLTAGE, VO (V)

2.0

0.5

1.5

1.0

VI = 36 V

VI = 48 V

VI = 75 V

2.5

3.0

123456

OUTPUT CURRENT, IO (A)

OUTPUT V OL TAGE, V O (V)

VI = 48 V

VI = 36 V

VI = 75 V

6Tyco Electronics Corp.

Data Sheet

November 2001

36 Vdc to 75 Vdc In; 3. 3 Vdc and 5 Vdc Out; 16.5 W and 25 W

LUW025-Series Power Modules: dc-dc Converters:

Characteristics Curves (continued)

8-2809

Figure 5. Typical LUW025F Converter Efficiency

vs. Output Current, TA = 25 °C

8-2810

Figure 6. Typical LUW025A Converter Efficiency

vs. Output Current, TA = 25 °C

8-1261c

Figure 7. LUW025A, F Typical Output Voltage for a

Step Load Chang e from 50% to 25%

8-1262

Figure 8. LUW025A, F Typical Output Voltage for a

Step Load Chang e from 50% to 75%

1 2 3 4

OUTPUT CURRENT, IO (A)

EFFICIENCY, η (%)

VI = 36 V

VI = 75 V

1 2 3 4

OUTPUT CURRENT, IO (A)

EFFICIENCY, η (%)

VI = 36 V

VI = 75 V

TIME, t (100 µs/div)

OUTPUT CURRENT, IO (A)

(1.25 A/div) OUTPUT V OLTAGE, VO (V)

(50 mV/div)

1.25A

2.5A

OUTPUT CURRENT, IO (A)

(1.25 A/div)

TIME, t (100 µs/div)

OUTPUT V OLTAGE, VO (V)

(50 mV/div)

2.5A

3.75A

Tyco Electroni cs Corp.

Data Sheet

No vember 2001 36 Vdc to 75 Vdc In; 3.3 Vdc and 5 Vdc Out; 16.5 W and 25 W

LUW025-Series Power Modules: dc-dc Converters:

Characteristics Curves (continued)

8-1263e

Figure 9. LUW025A, F Typical Output Voltage Start-

Up when Signal Is Applied to Remote On/

Off

Test Configurations

8-203p

Note: Input reflected-ripple current is measured with a simulated

source inductance (LTEST) of 12 µH. Capacitor Cs offset s

possible battery impedance. Current is measured at the input

of the module.

Figure 10. Input Reflected-Ripple Test Setup

8-513d

Note: Use one e xternal 1 µF ceramic capacitor (nearest to the mod-

ule) and one 10 µF aluminum or tantalum capacitor (nearest

to the load). Scope measurement should be made using a

BNC socket . Position the load between 50 mm and 75 mm

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

Figure 11. Peak-to-Peak Output Noise

Measurement Test Setup

8-204

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

socketing, place Kelvin connections at module term i nal s to

avoid measurement errors due to socket contact resistance.

Figure 12. Output Voltage and Efficiency

Measurement Test Setup

Design Considerations

Input Source Impedance

The power module should be connected to a low

ac-impedance input source (see Figure 10). Highly

inductive source impedances can affect the stability of

the power module. For the test configuration in Figure

10, a 33 µF electrolytic capacitor (ESR < 0.7 ¾ at

100 kHz) mounted close to the power module helps

ensure stability of the unit. For other highly inductive

source impedances, consult the factory for further

application guidelines.

TIME, t (1 ms/div)

NORMALIZED

OUTPUT V OLTAGE, VO

REMOTE ON/OFF,

Von/off (V) (2 V/div)

TO OSCILLOSCOPE

12 µH

220 µF

ESR < 0.1 Ω

@ 20 ˚C, 100 kHz

(+)

(-)

BATTERY 33 µF

CURRENT

PROBE

TEST

1.0

FRESISTIVE

SCOPE

COPPER STRIP

FLOAD

(+)

(–)

VI(+)

VI(-)

VO(+)

VO(-)

IIIO

SUPPLY

CONTACT RESISTANCE

CONTACT AND

DISTRIBUTION LOSSES

LOAD

ηVO(+) VO(–)–[]IO

VI(+) VI(–)

–[]II

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





100

×=%

8Tyco Electronics Corp.

Data Sheet

November 2001

36 Vdc to 75 Vdc In; 3. 3 Vdc and 5 Vdc Out; 16.5 W and 25 W

LUW025-Series Power Modules: dc-dc Converters:

Safety Considerations

For safety-agency approval of the system in which the

power module is used, the power module must be

installed in compliance with the spacing and separation

requirements of the end-use safety agency standard,

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

0805 (IEC60950).

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

voltage greater than 60 Vdc and less than or equal to

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

meeting the requirements of safety extra-low voltage

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

■The input source is to be provided with reinforced

insulation from any other hazardous voltages, includ-

ing 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 the module are not operator acces-

sible.

■Another SELV reliability test is conducted on the

whole system, as required by the saf ety agencies, on

the combination of supply source and the subject

module to verify that under a single fault, hazardous

vol tag es do not appear at the module 's outpu t.

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 pins and ground.

The power module has e xtr a-low voltage (ELV) outputs

when all inputs are ELV.

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

mum 5 A normal-blow fuse in the ungrounded lead.

Feature Descriptions

Overcurrent Protection

To provide protection in a fault (output overload) condi-

tion, the unit is equipped with internal current-limiting

circuitry and can endure current limiting for an unlim-

ited duration. At the point of current-limit inception, the

unit shifts from voltage control to current control. If the

output voltage is pulled very low during a severe fault,

the current-limit circuit can exhibit either foldback or

tailout characteristics (output-current decrease or

increase). The unit operates normally once the output

current is brought back into its specified range.

Remote On/Off

The remote on/off signal is referenced to the primary

and is available with either positive or negative logic.

Positive logic remote on/off turns the module on during

a logic-high voltage on the REMOTE ON/OFF pin, and

off during a logic low. Negative logic, device code suffix

“1,” turns the module off during a logic high and on dur-

ing a logic low and is the factory-pref erred configuration

(see the Feature Specifications tab le).

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

must supply a switch to control the voltage between the

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

switch may be an open collector or equivalent (see Fig-

ure 13). A logic low is Von/off = 0 V to 1.2 V. The maxi-

mum 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 pow er module is 10 V. The maximum allowable

leakage current of the switch at Von/off = 10 V is 50 µA.

8-758e

Figure 13. Remote On/Off Implemen tat ion

Output Voltage Set-Point Adjustment

(Trim)

Output voltage adjustment (trim) allows the user to

increase or decrease the output voltage set point of a

module. This is accomplished by connecting an exter-

nal resistor between the TRIM pin and either the VO(+)

or VO(–) p in.

Connecting an external resistor between the TRIM pin

and VO(–) pin (Radj-down) decreases the output voltage

set point (see Figure 14). In order to maintain the out-

put voltage accuracy, the trim resistor tolerance should

be ±0.1%.

Ion/off

Von/off

REMOTE

ON/OFF

VI(+)

VI(-)

LOAD

VO(-)

VO(+)

Tyco Electroni cs Corp. 9

Data Sheet

No vember 2001 36 Vdc to 75 Vdc In; 3.3 Vdc and 5 V dc Out; 16.5 W and 2 5 W

LUW025-Series Power Modules: dc-dc Converters:

Feature Descriptions (continued)

Output Voltage Set-Point Adjustment

(Trim) (continued)

8-715h

Figure 14. Circuit Configuration to Decrease

Output Voltage

The relationship between the output voltage and the

trim resistor value for a ý% reduction in output voltage

is:

Connecting an external resistor between the TRIM pin

and VO(+) pin (Radj-up) increases the output voltage set

point (see Figure 15).

The relationship between the output voltage and the

trim resistor value for a ý% increase in output voltage

is:

8-715g

Figure 15. Circuit Configuration to Increase

Output Voltage

Output Overvoltage Protection

The output overvoltage clamp consists of control cir-

cuitry, independent of the primary regulation loop, that

monitors the voltage on the output terminals. This con-

trol loop of the protection circuit has a higher voltage

set point than the primary loop (see Feature Specifica-

tions table). In a f ault condition, the overvoltage clamp

ensures that the output voltage does not exceed

VO, clamp, max. This provides a redundant voltage-con-

trol that reduces the risk of output overvoltage.

Overtemperature Protection

These modules feature an overtemperature protection

circuit to safeguard against thermal damage. The cir-

cuit shuts down and latches off the module when the

maximum Tref temperature is exceeded. The module

will automatically restart when the Tref temperature

cools sufficiently.

Thermal Considerations

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 is removed by convection and radiation to the sur-

rounding environment.

Considerations include ambient temper ature, amount

of airflow, module power dissipation, and need f or

increased reliability.

The monitor temperature reference point, Tref, refer-

enced in the specification is T1. Proper cooling can be

verified by measuring the power module’s temperature

at the top center surface of T1 as shown in Figures

17—18. The temperature at the thermocouple location,

T1, should not exceed 110 °C dur i ng the operat io n of

the module. The output pow er of the module should not

exceed the rated power.

The thermal data presented is based on measure-

ments taken in a wind tunnel. The test setup shown in

Figure 16 was used to collect data for Figures 17—18.

Note that the orientation of the module with respect to

airflow affects thermal performance. Two orientations

are shown in Figures 17—18.

TRIM

VO(+)VI(+)

ON/OFF

VI(–)Radj-down

RLOAD

VO(–)

CASE

Radj-down 511

∆%

----------6.11–





kΩ=

Radj-up VO5.11•

()

100 ∆%+()

1.225∆%

--------------------------------------------------------------511

∆%

----------

–6.11

–





kΩ=

RLOAD

Radj-up

VI(+)

ON/OFF

CASE

VI(–)

VO(+)

TRIM

VO(–)

1010 Tyco Electronics Corp.

Data Sheet

November 2001

36 Vdc to 75 Vdc In; 3 .3 V dc and 5 Vdc Out ; 16.5 W and 25

LUW025-Series Power Modules: dc-dc Converters:

Draft Copy Only Lucent Technologies — Proprietary Use pursuant t o Company instructions

Thermal Considerations (continued)

8-2603a

Note: Dimensions are in millimeters and (inches).

Figure 16. Thermal Test Setup

8-2788

Figure 17. TQ Temperature Measurement Location;

Top View; Orientation 1

8-2789

Figure 18. TQ Temperature Measurement Location;

Top View; Orientation 2

Convection Requirements for Cooling

To predict the approximate cooling needed for the mod-

ule, determine the power dissipated as heat by the unit

for the particular application. Figures 19—20 show typ-

ical heat dissipation for the module over a range of out-

put currents.

8-3026

Figure 19. LUW025F Power Dissipation vs. Output

Current, TA = 25 °C; Either Orientation

8-1888b

Figure 20. LUW025A Power Dissipation vs. Output

Current, TA = 25 °C; Either Orientation

With the known heat dissipation, module orientation

with respect to airflow, and a given local ambient tem-

perature, the minimum airflow can be chosen from the

derating curves in Figures 21—24.

AIRFLOW

25.4 (1.0)

FOR AIR VELOCITY

AND AMBIENT

TEMPERATURE

MEAS URE HE RE

203.2 (8.0)

76.2 (3.0)

AIRFLOW

THERMOCOUPLE

LOCATION T1

AIRFLOW

THERMOCOUPLE

LOCATION T1

1.00 3.00 4.00

0.00

OUTPUT CURRENT, IO (A)

3.00

2.00

5.00

6.00

5.000.40

1.00

POWER DISSIPATION, PD (W)

4.00

2.00

VI = 75 V

VI = 48 V

VI = 36 V

00.5 1 1.5 2 4.5 5

OUTPUT CURRENT, IO (A)

POWER DISSIPATION, PD (W)

2.5 3 3.5 4

6VI = 75 V

VI = 48 V

VI = 36 V

Tyco Electroni cs Corp. 11

Data Sheet

No vember 2001 36 Vdc to 75 Vdc In; 3.3 Vdc and 5 V dc Out; 16.5 W and 2 5 W

LUW025-Series Power Modules: dc-dc Converters:

Thermal Considerations (continued)

Convection Requirements for Cooling

(continued)

8-2980

Figure 21. LUW025F Power Derating vs. Local

Ambient Temperature and Air Velocity;

Orientation 1 (Preliminary)

8-2981

Figure 22. LUW025A Power Derating vs. Local

Ambient Temperature and Air Velocity;

Orientation 1

8-2979

Figure 23. LUW025F Power Derating vs. Local

Ambient Temperature and Air Velocity;

Orientation 2 (Preliminary)

8-2982

Figure 24. LUW025A Power Derating vs. Local

Ambient Temperature and Air Velocity;

Orientation 2

F or example, if the LUW025A dissipates 3 W of heat at

2.7 A load, the minimum airflow for Orientation 1 in a

80 °C environment is 1.0 m/s (200 ft./min.).

Keep in mind that these derating curves are approxi-

mations of the ambi ent temp eratu res and airflows

required to keep the power module temperature below

its maximum rating. Once the module is assembled in

the actual system, the module’s temperature should be

checked as shown in Figures 17—18 to ensure it does

not exceed 110 °C.

10 20

10004030 90

50 60 70 80

LOCAL AMBIENT TEMPERATURE, TA (˚C)

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

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

1.5 m/s (300 ft./min.)

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

0.5 m/s (100 ft./min.)

NATURAL

CONVECTION

POWER DISSIPATION, PD (W)

10 20

LOCAL AMBIENT TEMPERATURE, T

(˚C)

10004030 90

50 60 70 80

POWER DISSIPATION, P

(W)

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

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

1.5 m/s (300 ft./min.)

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

0.5 m/s (100 ft./min.)

NATURAL

CONVECTION

10 20

10004030 90

50 60 70 80

LOCAL AMBIENT TEMPERATURE, TA (˚C)

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

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

1.5 m/s (300 ft./min.)

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

0.5 m/s (100 ft./min.)

NATURAL

CONVECTION

POWER DISSIPATION, P D (W)

10 20

LOCAL AMBIENT TEMPERATURE, T

A (˚C)

10004030 90

50 60 70 80

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

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

1.5 m/s (300 ft./min.)

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

0.5 m/s (100 ft./min.)

NATURAL

CONVECTION

POWER DISSIPATION, PD (W)

12 Tyco Electronics Corp.

Data Sheet

November 2001

36 Vdc to 75 Vdc In; 3. 3 Vdc and 5 Vdc Out; 16.5 W and 25 W

LUW025-Series Power Modules: dc-dc Converters:

EMC Considerations

Figure 25 shows the suggested configuration to meet EN55022 Class B conducted limits.

8-2684a

Figure 25. Suggested Configuration for EN55022

For assistance with designing for EMC compliance, refer to the FLTR100V10 Filter Module Data Sheet

(DS99-294EPS).

Layout Considerations

Copper paths must not be routed beneath the power module conductive spacer. For additional layout guidelines,

refer to the FLT R1 00V 10 Filter Module Data Sheet (DS99-294EPS).

V(+)

V(–)

POWER

COM

33 µF

100 V

0.47 µF

100 V

3.3 mH COMMON-

MODE CHOKE

(GROUNDED)

MODULE

100 nF CERAMIC

Tyco Electroni cs Corp. 13

Data Sheet

No vember 2001 36 Vdc to 75 Vdc In; 3.3 Vdc and 5 Vdc Out; 16.5 W and 25 W

LUW025-Series Power Modules: dc-dc Converters:

Outline Diagram (Surface Mount Outline)

Dimensions are in millimeters and (inches).

Tolerances: x.x ± 0.5 mm (0.02 in.); x.xx ± 0.25 mm (0.010 in.).

1-0222

Top View

Side View

Bottom View

Pin Description

1ON/OFF

I(–)

I(+)

O(+)

O(–)

6TRIM

50.0 (1.97) MAX

50.0

(1.97)

MAX

8.5

(0.335)

MAX

8.65

(0.34)

MAX

MATI NG PWB

SURFACE

W HEN ASSEMBLED ONTO

PWB, WITH AN HOLE

1.5mm

SPHERE TERMINATION,

SOLDER-PLATED BRASS,

6 PLACES

CONDUCTIVE SPACER

2 PLACES

3.2 SQUARE

(0.126)

TYP.

10.16

(0.400) 20.32

(0.800)

9.76

(0.384)

2.54

(0.100)

12.7

(0.500)

17.78

(0.700)

36.3

(1.43)

1.8

(0.07)

43.8 (1.72)

45.72 (1.800)

2.14 (0.084)

14 Tyco Electronics Corp.

Data Sheet

November 2001

36 Vdc to 75 Vdc In; 3. 3 Vdc and 5 Vdc Out; 16.5 W and 25 W

LUW025-Series Power Modules: dc-dc Converters:

Recommended Hole Patter n (Surface Mount Footprint)

Component-side footprint. See pin descriptions on the previous page.

Dimensions are in millimeters and (inches).

1-0224

Ordering Information

Please contact your Tyco Electronics’ Account Manager or Field Application Engineer for pricing and availability.

Table 6. Device Codes

Optional features may be ordered using the device code suffixes shown below. The feature suffixes are listed

numerically in descending order.

Table 7. Device Options

Input Voltage Output Voltage Output Power Device Code Comcode

48 V 5 V 25 W LUW025A 108409384

48 V 5 V 25 W LUW025A8 108934258

48 V 5 V 25 W LUW025A-S 108903469

48 V 3.3 V 16.5 W LUW025F 108409392

48 V 3.3 V 16.5 W LUW025F1-S 108869322

48 V 3.3 V 16.5 W LUW025F6 108958257

48 V 3.3 V 16.5 W LUW025F8 108934241

48 V 3.3 V 16.5 W LUW025F-S 108959172

Option Device Code Suffix

Surface mountable -S

Short pins: 2.79 mm ± 0.25 mm

(0.110 in. ± 0.010 in.) 8

Short pins: 3.81 mm ± 0.25 mm

(0.150 in. ± 0.010 in.) 6

Negative remote on/off logic 1

3.2 (0.126) SQUARE

CONDUCTIVE SPACER

2 PLACES

36.3

(1.43)

17.78

(0.700)

12.7

(0.500)

2.54

(0.100)

1.8

(0.07)

9.76

(0.384)

10.16

(0.400)

20.32

(0.800)

43.8 (1.72)

45.72 (1.800)

2.14 (0.084)

HOLE

1.5 (0.59)

6 PLACES

Data Sheet

November 2001

36 Vdc to 75 Vdc In; 3. 3 Vdc and 5 Vdc Out; 16.5 W and 25 W

LUW025-Series Power Modules: dc-dc Converters:

Printed on

Recycled Paper

Tyco Electronics P ow er Systems, Inc.

3000 S kyline Drive , Me squite , TX 75 149, U SA

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

(Outside U.S.A.: +1-972-284-2626, FAX : + 1 -972-28 4 -2 9 00

http://power.tycoeleectronics.com

Tyco Electronics Corportation reserv es the right to mak e changes to the pro duct(s) or inf ormation cont ained her ein with out 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.

November 2001

FDS01-031 EPS (Replace s D S00-162EPS, Re places DS99 -269EPS)