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Advance Data Sheet March 1999
LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W
Features
Low profile: 9.91 mm (0.390 in.) with 0.38 mm (0.015 in.) standoffs, 9.53 mm (0.375 in.) with standoffs recessed Wide input voltage range: 36 Vdc to 75 Vdc Input-to-output isolation Operating case temperature range: -40 C to +110 C Metal case Overcurrent protection Remote on/off Output voltage adjust: 90% to 110% of VO, nom Output overvoltage protection

The LW025 Single-Output-Series Power Modules use advanced, surface-mount technology and deliver high-quality, compact, dc-dc conversion at an economical price.

UL* 1950 Recognized, CSA C22.2 No. 950-95 Certified, VDE 0805 (EN60950, IEC950) Licensed
CE mark meets 73/23/EEC and 93/68/EEC directives Within FCC and EN55022 (CISPR 22) Class A radiated limits
Options

Choice of on/off configuration Case ground pin Synchronization Short pins: 2.79 mm 0.25 mm (0.110 in. 0.010 in.) Short pins: 3.68 mm 0.25 mm (0.145 in. 0.010 in.)
Applications

Distributed power architectures Telecommunications
Description
The LW025 Single-Output-Series Power Modules are low-profile dc-dc converters that operate over an input voltage range of 36 Vdc to 75 Vdc and provide precisely regulated outputs. The output is isolated from the input, allowing versatile polarity configurations and grounding connections. The module has a maximum power rating of 25 W at a typical full-load efficiency of 79%. The power modules feature remote on/off and output voltage adjustments of 90% to 110% of the nominal output voltage. Built-in filtering for both input and output minimizes the need for external filtering.
* UL is a registered trademark of Underwriters Laboratories, Inc. CSA is a registered trademark of Canadian Standards Association. This product is intended for integration 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.)
LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W
Advance Data Sheet March 1999
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the devices. These are absolute stress ratings only. Functional operation of the devices 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. Parameter Input Voltage: Continuous Transient (100 ms) Operating Case Temperature (See Figure 16.) Storage Temperature I/O Isolation Voltage Symbol VI VI, trans TC Tstg -- Min 0 0 -40 -40 -- Max 80 100 110* 120 1500 Unit Vdc V C C Vdc
* Maximum case temperature varies based on power dissipation. See derating curves, Figures 15--16, for details.
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. Table 1. Input Specifications Parameter Operating Input Voltage Maximum Input Current (VI = 0 V to VI, max; IO = IO, max; see Figures 1 and 2.) Inrush Transient Input Reflected-ripple Current (50 Hz to 20 MHz; 12 H source impedance, TC = 25 C; see Figure 10.) Input Ripple Rejection (100 Hz--120 Hz) Symbol VI II, max i2t II Min 36 -- -- -- Typ 48 -- -- 3 Max 75 1.2 0.1 -- Unit Vdc A A2s mAp-p
--
--
60
--
dB
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 maximum flexibility, internal fusing is not included; however, to achieve 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.
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Tyco Electronics Corp.
Advance Data Sheet March 1999
LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W
Electrical Specifications (continued)
Table 2. Output Specifications Parameter Output Voltage Set Point (VI = 48 V; IO = IO, max; TC = 25 C) Output Voltage (Over all line, load, and temperature conditions until end of life; see Figure 12.) Output Regulation: Line (VI = 36 V to 75 V) Load (IO = IO, min to IO, max) Temperature (TC = -40 C to +100 C) Output Ripple and Noise (See Figure 11.): RMS Peak-to-peak (5 Hz to 20 MHz) Output Current (At IO < IO, min, the modules may exceed output ripple specifications.) Output Current-limit Inception (VO = 90% x VO, set; see Figures 3 and 4.) Output Short-circuit Current (VO = 250 mV) Efficiency (VI = VI, nom; IO = IO, max; TC = 25 C; see Figures 5, 6, and 12.) Switching Frequency Dynamic Response (yIO/yt = 1 A/10 s, VI = VI, nom, TA = 25 C): Load Change from IO = 50% to 75% of IO, max: Peak Deviation Settling Time (VO < 10% peak deviation) Load Change from IO = 50% to 25% of IO, max: Peak Deviation Settling Time (VO < 10% peak deviation) Table 3. Isolation Specifications Parameter Isolation Capacitance Isolation Resistance Min -- 10 Typ 0.002 -- Max -- -- Unit F M3/4 Device LW025F LW025A LW025F LW025A Symbol VO, set VO, set VO VO Min 3.25 4.92 3.17 4.85 Typ 3.3 5.0 -- -- Max 3.35 5.08 3.43 5.15 Unit Vdc Vdc Vdc Vdc
All All All All All All
-- -- -- -- -- IO
-- -- -- -- -- 0.4
0.01 0.05 0.5 -- 20 --
0.1 0.4 1.0 40 100 5.0
%VO %VO %VO mVrms mVp-p A
All All LW025F LW025A All
IO IO --
103 -- 75 77 --
-- 135 77 79 256
150 200 -- -- --
%IO, max %IO, max % % kHz
All All All All
-- -- -- --
-- -- -- --
1 0.5 1 0.5
-- -- -- --
%VO, set ms %VO, set ms
General Specifications
Parameter Calculated MTBF (IO = 80% of IO, max; TC = 40 C) Weight -- Min Typ 5,500,000 -- 54 (1.9) Max Unit hours g (oz.)
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LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W
Advance Data Sheet March 1999
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See Feature Descriptions and Design Considerations for further information. Parameter Remote On/Off Signal Interface: (VI = 0 V to VI, max; open collector or equivalent compatible; signal referenced to VI(-) terminal. See Figure 13 and Feature Descriptions.): Negative Logic: Device Code Suffix "1": Logic Low--Module On Logic High--Module Off Positive Logic: If Device Code Suffix "1" Is Not Specified: Logic Low--Module Off Logic High--Module On Module Specifications: On/Off Current: Logic Low On/Off Voltage: Logic Low Logic High (Ion/off = 0) Open Collector Switch Specifications: Leakage Current During Logic High (Von/off = 10 V) Output Low Voltage During Logic Low (Ion/off = 1 mA) Turn-on Delay and Rise Times (at 80% of IO, max; TA = 25 C): Case 1: On/Off Input Is Set for Unit On and Then Input Power Is Applied (delay from point at which VI = 48 V until VO = 10% of VO, nom). Case 2: 48 V Input Is Applied for at Least One Second, and Then the On/Off Input Is Set to Turn the Module On (delay from point at which on/off input is toggled until VO = 10% of VO, nom). Output Voltage Rise Time (time for VO to rise from 10% of VO, nom to 90% of VO, nom) Output Voltage Overshoot (at 80% of IO, max; TA = 25 C) Output Voltage Set-point Adjustment Range Output Overvoltage Protection (clamp) Device Symbol Min Typ Max Unit
All All All All All
Ion/off Von/off Von/off Ion/off Von/off
-- -0.7 -- -- --
-- -- -- -- --
1.0 1.2 10 50 1.2
mA V V A V
All
Tdelay
--
27
50
ms
All
Tdelay
--
2
10
ms
All All All LW025F LW025A
Trise -- -- VO, clamp VO, clamp
-- -- 90 3.9 5.6
1.5 -- -- -- --
3.0 5 110 5.0 7.0
ms % %VO, nom V V
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Tyco Electronics Corp.
Advance Data Sheet March 1999
LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W
Characteristics Curves
0.8 0.7 INPUT CURRENT, II (A) 0.6 0.5 0.4 0.3 0.2 0.1 IO = 0.4 A IO = 2.5 A IO = 5 A
OUTPUT VOLTAGE, VO (V)
3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 1 2 3 4 5 6 7 8 OUTPUT CURRENT, IO (A) VI = 75 V VI = 48 V VI = 36 V
0.0 0 10 20 30 40 50 60 70 80 INPUT VOLTAGE, V I (V)
8-2233(C)
8-2234(C)
Figure 3. LW025F Typical Output Characteristics
Figure 1. LW025F Typical Input Characteristics
6 OUTPUT VOLTAGE, V O (V) 5 4 3 2 1 0
0.2 0.0 0 10 20 30 40 50 60 70 80 INPUT VOLTAGE, V I (V)
8-1982(C).b
1.2 1.0 INPUT CURRENT, II (A) 0.8 0.6 0.4 IO = 0.4 A IO = 2.5 A IO = 5 A
VI = 75 V VI = 48 V VI = 36 V
0
1
2
3
4
5
6
7
OUTPUT CURRENT, IO (A)
8-1983(C)
Figure 4. LW025A Typical Output Characteristics
Figure 2. LW025A Typical Input Characteristics
Tyco Electronics Corp.
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LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W
Advance Data Sheet March 1999
78 76 74 EFFICIENCY, (%) 72 70 68 66 64 62 60 0.4 0.9 1.4 1.9 2.4 2.9 3.4 3.9 4.4 4.9 VI = 36 V VI = 48 V VI = 75 V
OUTPUT CURRENT, I (A) O (1.25 A/div)
OUTPUT VOLTAGE, V O (V) (50 mV/div)
2.5A 1.25A
8-2478(C)
Characteristics Curves (continued)
OUTPUT CURRENT, IO (A)
TIME, t (100 s/div)
8-1261(C).c
Figure 5. LW025F Typical Converter Efficiency vs. Output Current
Figure 7. LW025A, F Typical Output Voltage for a Step Load Change from 50% to 25%
85
OUTPUT VOLTAGE, VO (V) (50 mV/div)
80 EFFICIENCY, (%)
75 VI = 36 V VI = 48 V VI = 75 V
70
65
60 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 OUTPUT CURRENT, IO (A)
8-1984(C)
OUTPUT CURRENT, IO (A) (1.25 A/div)
3.75 A 2.5 A
Figure 6. LW025A Typical Converter Efficiency vs. Output Current
TIME, t (100 s/div)
8-1262(C)
Figure 8. LW025A, F Typical Output Voltage for a Step Load Change from 50% to 75%
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Tyco Electronics Corp.
Advance Data Sheet March 1999
LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W
Characteristics Curves (continued)
Test Configurations
TO OSCILLOSCOPE CURRENT PROBE VI(+)
REMOTE ON/OFF, Von/off (V) (2 V/div)
LTEST 12 H
5V
BATTERY
CS 220 F IMPEDANCE < 0.1 @ 20 C, 100 kHz
33 F
VI(-)
0 NORMALIZED OUTPUT VOLTAGE, V O
8-203(C)
Note: Input reflected-ripple current is measured with a simulated source impedance of 12 H. Capacitor Cs offsets possible battery impedance. Current is measured at the input of the module.
Figure 10. Input Reflected-Ripple Test Setup
0 TIME, t (1 ms/div)
8-1263(C).e
COPPER STRIP VO(+)
Figure 9. LW025A, F Typical Output Voltage StartUp when Signal Is Applied to Remote On/Off
VO(-)
0.1 F
SCOPE
RESISTIVE LOAD
8-513(C)
Note: Use a 0.1 F ceramic capacitor. 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
CONTACT AND DISTRIBUTION LOSSES VI(+) II SUPPLY VI(-) CONTACT RESISTANCE
8-204(C)
VO(+) IO LOAD
VO(-)
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.
[ VO(+) - VO(-) ]IO = ----------------------------------------------- x 100 [ VI(+) - VI(-) ]II Figure 12. Output Voltage and Efficiency Measurement Test Setup
%
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LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W
Advance Data Sheet March 1999
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 extra-low voltage (ELV) outputs when all inputs are ELV. The input to these units is to be provided with a maximum 5 A normal-blow fuse in the ungrounded lead.
Design Considerations
Grounding Considerations
For modules without the isolated case ground pin option, the case is internally connected to the VI(+) pin. For modules with the isolated case ground pin, device code suffix "7," the VI(+) pin is not connected to the case.
Input Source Impedance
The power module should be connected to a low acimpedance input source. Highly inductive source impedances can affect the stability of the power module. For the test configuration in Figure 10, a 33 F electrolytic capacitor (ESR < 0.7 3/4 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.
Feature Descriptions
Overcurrent Protection
To provide protection in a fault (output overload) condition, the unit is equipped with internal current-limiting circuitry and can endure current limiting for an unlimited 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.
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 1950, CSA C22.2 No. 950-95, and VDE 0805 (EN60950, IEC950). 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:
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 REMOTE ON/OFF pin, and off during a logic low. Negative logic, device code suffix "1," remote on/off turns the module off during a logic high and on during a logic low. 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 13). A logic low is Von/off = -0.7 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 6 V. The maximum allowable leakage current of the switch at Von/off = 6 V is 50 A. The module has internal capacitance to reduce noise at the ON/OFF pin. Additional capacitance is not generally needed and may degrade the start-up characteristics of the module.
The input source is to be provided with reinforced insulation from any other hazardous voltages, including the ac mains; and One VI pin and one VO pin are to be grounded or both the input and output pins are to be kept floating; and The input pins of the module are not operator accessible; and Another SELV reliability test is conducted on the whole system, as required by the safety agencies, 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.
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Advance Data Sheet March 1999
LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W
Feature Descriptions (continued)
Remote On/Off (continued)
VI(+) VI(-)
Von/off
+
Ion/off REMOTE ON/OFF
8-758(C).a
Figure 13. Remote On/Off Implementation
Output Voltage Adjustment
Output voltage trim allows the user to increase or decrease the output voltage set point of a module. This is accomplished by connecting an external resistor between the TRIM pin and either the VO(+) or VO(-) pins. With an external resistor between the TRIM and VO(+) pins (Radj-down), the output voltage set point (VO, adj) decreases. With an external resistor between the TRIM pin and VO(-) pin (Radj-up), VO, adj increases. The following equations determine the required external resistor value to obtain an output voltage change of y%: c [ d ( 1 - % ) - 1 ] Radj-down = ------------------------------------------------ - b k % a Radj-up = ---------------- - b k d % Device LW025F LW025A a 14.0 4.02 b 51.1 16.9 c 5.2 2.01 d 2.7 2.0 -5% VO Radj-down 111.7 k3/4 19.3 k3/4 +5% VO Radj-up 52.7 k3/4 23.3 k3/4
The adjusted output voltage cannot exceed 110% of the nominal output voltage between the VO(+) and VO(-) terminal. The modules have a fixed current-limit set point. Therefore, as the output voltage is adjusted down, the available output power is reduced. In addition, the minimum output current is a function of the output voltage. As the output voltage is adjusted down, the minimum required output current can increase.
Output Overvoltage Protection
The output overvoltage clamp consists of control circuitry, independent of the primary regulation loop, that monitors the voltage on the output terminals. The control loop of the protection circuit has a higher voltage set point than the primary loop (see Feature Specifications table). In a fault condition, the overvoltage clamp ensures that the output voltage does not exceed VO, clamp, max. This provides a redundant voltage-control that reduces the risk of output overvoltage. Tyco Electronics Corp. 9
LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W
Advance Data Sheet March 1999
Note that the view in Figure 14 is of the metal surface of the module--the pin locations shown are for reference. The temperature at this location should not exceed the maximum case temperature indicated in the derating curve shown in Figure 16. The output power of the module should not exceed the rated power for the module as listed in the Ordering Information table.
Feature Descriptions (continued)
Synchronization (Optional)
The unit is capable of external synchronization from an independent time base with a switching rate of 256 kHz. The amplitude of the synchronizing pulse train is TTL compatible and the duty cycle ranges between 40% and 60%. Synchronization is referenced to VI(+).
Heat Transfer
Increasing airflow over the module enhances the heat transfer via convection. Figure 16 shows the maximum power that can be dissipated by the module without exceeding the maximum case temperature versus local ambient temperature (TA) for natural convection through 3.0 ms-1 (600 ft./min.). Systems in which these power modules may be used typically generate natural convection airflow rates of 0.3 ms-1 (60 ft./min.) due to other heat-dissipating components in the system. Therefore, the natural convection condition represents airflow rates of up to 0.3 ms-1 (60 ft./min.). Use of Figure 16 is shown in the following example. Example What is the minimum airflow necessary for a LW025A operating at VI = 75 V, an output current of 3.5 A, and a maximum ambient temperature of 85 C?
Thermal Considerations
Introduction
The LW025 Single-Output-Series 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 thermally coupled to the case. Heat is removed by conduction, convection, and radiation to the surrounding environment. Proper cooling can be verified by measuring the case temperature. Peak case temperature (TC) occurs at the position indicated in Figure 14.
26.9 (1.06)
TRIM ON/OFF NC
19.6 (0.77)
Solution Given: VI = 75 V, IO = 3.5 A, TA = 85 C Determine PD (Figure 18): PD = 4.5 W Determine airflow (Figure 16): v = 1.0 ms-1 (200 ft./min.)
-
LW025A871 OUT - DC-DC CONVERTER IN IN:DC 36-75V, 1.20A + + OUT:DC 5.0V, 5.0A
MADE IN USA
CASE PIN (OPTIONAL)
8-1265(C).c
Note: Dimensions are in millimeters and (inches). Pin locations are for reference only.
Figure 14. Case Temperature Measurement Location
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Advance Data Sheet March 1999
LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W
Thermal Considerations (continued)
6 POWER DISSIPATION PD (W)
Heat Transfer (continued)
5 4 3 2 1 0 0.4
VI = 75 V VI = 48 V VI = 36 V
5 POWER DISSIPATION PD (W) 4 3 2 1 0 40
MAX CASE TEMPURATURE 1.0 ms -1 (600 ft./min.) 2.0 ms -1 (400 ft./min.) 3.0 ms -1 (200 ft./min.) NATURAL CONVECTION
0.9
1.4
1.9
2.4
2.9
3.4
3.9
4.4 4.9
OUTPUT CURRENT, I O (A)
8-2479(C)
50
60
70
80
90
100
110
Figure 17. LW025F Power Dissipation vs. Output Current, TA = 25 C
MAX AMBIENT TEMPERATURE, TA (C)
8-2477(C)
POWER DISSIPATION, PD (W)
Note: Conversion factor for linear feet per minute to meters per second: 200 ft./min. = 1 ms-1.
8 7 6 5 4 3 2 1 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 OUTPUT CURRENT, IO (A)
8-1888(C).a
Figure 15. LW025F Forced Convection Power Derating; Either Orientation
VI = 75 V VI = 48 V VI = 36 V
9 POWER DISSIPATION, PD (W) 8 7 6 5 4 3 2 1 0 40 NATURAL CONVECTION 1.0 ms -1 (200 ft./min.) 2.0 ms -1 (400 ft./min.) 3.0 ms -1 (600 ft./min.) MAX CASE TEMPERATURE
Figure 18. LW025A Power Dissipation vs. Output Current, TA = 25 C
50
60
70
80
90
100
110
MAX AMBIENT TEMPERATURE, TA (C)
8-1985(C)
Note: Conversion factor for linear feet per minute to meters per second: 200 ft./min. = 1 ms-1.
Figure 16. LW025A Forced Convection Power Derating; Either Orientation
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LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W
Advance Data Sheet March 1999
Thermal Considerations (continued)
Module Derating
The derating curves in Figure 16 were determined from measurements obtained in an experimental apparatus shown in Figure 19. Note that the module and the printed-wiring board (PWB) that it is mounted on are vertically oriented. The passage has a rectangular cross-section.
Layout Considerations
Copper paths must not be routed beneath the power module standoffs.
FACING PWB
PWB
MODULE
AIR VELOCITY AND AMBIENT TEMPERATURE MEASURED BELOW THE MODULE
AIRFLOW
76 (3.0)
13 (0.5)
8-1126(C).d
Note: Dimensions are in millimeters and (inches).
Figure 19. Experimental Test Setup
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Tyco Electronics Corp.
Advance Data Sheet March 1999
LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W
Outline Diagram
Dimensions are in millimeters and (inches). Tolerances: x.x 0.5 mm (0.02 in.), x.xx 0.25 mm (0.010 in.). Pin-to-pin tolerances are not cumulative. Note: For standard modules, VI(+) is internally connected to the case. Top View
50.8 (2.00)
Pin 1 2
TRIM ON/OFF NC 50.8 (2.00) IN +
Function Remote On/Off No Connection (sync feature optional) VI(-) VI(+) Case Pin (pin optional) Trim - Output + Output
3
OUT +
LW025A871 DC-DC CONVERTER
IN:DC 36-75V, 1.20A OUT:DC 5.0V, 5.0A MADE IN USA
4 5 6 7 8
Side View
CASE PIN (OPTIONAL)
0.38 0.13 (0.015 0.005) 9.91 0.38 (0.390 0.015) STANDOFFS 1.78 x 0.51 THICK (0.070 x 0.020), 4 PLACES
1.02 (0.040) DIA SOLDER-PLATED BRASS, ALL PINS
Bottom View
4.70 (0.185) MIN
22.9 (0.90)
5.08 (0.200) 5 8
20.3 (0.80)
5.08 (0.200) 5.08 (0.200)
4 3 2 1 5.08 (0.200)
10.16 (0.400) 7 10.16 (0.400) 6
2.5 (0.10)
45.72 0.38 (1.800 0.015)
2.5 (0.10) REF
8-1198(C).f
Tyco Electronics Corp.
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LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W
Advance Data Sheet March 1999
Recommended Hole Pattern
Component-side footprint. Dimensions are in millimeters and (inches).
50.8 (2.00) 45.72 (1.800)
2.5 (0.10)
12.7 (0.50)
5.08 (0.200)
2.54 (0.100)
12.4 (0.49) 50.8 (2.00)
20.32 (0.800) 37.8 (1.49)
15.24 (0.600)
10.16 (0.400)
7.62 (0.300) 17.78 (0.700)
3.43 (0.135)
38.86 (1.530) CASE OUTLINE
DRILL HOLE OF APPROX. 2.54 (0.100) DIAMETER TO RECESS STANDOFFS IF LOWER HEIGHT IS NEEDED
8-1198(C).f
Ordering Information
Table 4. Device Codes Input Voltage 48 V 48 V Output Voltage 3.3 V 5V Output Power 16.5 W 25 W Device Code LW025F LW025A Comcode 108448234 TBD
Optional features may be ordered using the device code suffixes shown below. To order more than one option, list suffixes in numerically descending order. Please contact your Tyco Electronics' Account Manager or Field Application Engineer for pricing and availability. Table 5. Option Codes Option Short pins: 2.79 mm 0.25 mm (0.110 in. 0.010 in.) Case ground pin Short pins: 3.68 mm 0.25 mm (0.145 in. 0.010 in.) Synchronization Negative logic on/off Device Code Suffix 8 7 6 3 1
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Tyco Electronics Corp.
Advance Data Sheet March 1999
LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W
Notes
Tyco Electronics Corp.
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LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W
Advance Data Sheet March 1999
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. (c) 2001 Tyco Electronics Corporation, Harrisburg, PA. All International Rights Reserved. Printed in U.S.A.
March 1999 DS98-052EPS
Printed on Recycled Paper

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