Advance Data Sheet
April 2008
LW025 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 25 W
The LW025 Single-Output-Series Power Modules use
advanced, surface-mount technology and deliver high-qual-
ity, compact, dc-dc conversion at an economical price.
Options
nChoice of on/off configuration
nCase ground pin
nSynchronization
nShort pins: 2.79 mm ± 0.25 mm
(0.110 in. ± 0.010 in.)
nShort pins: 3.68 mm ± 0.25 mm
(0.145 in. ± 0.010 in.)
Features
nLow profile: 9.91 mm (0.390 in.) with 0.38 mm
(0.015 in.) standoffs, 9.53 mm (0.375 in.) with
standoffs recessed
nWide input voltage range: 36 Vdc to 75 Vdc
nInput-to-output isolation
nOperating case temperature range: –40 °C to
+110 °C
nMetal case
nOvercurrent protection
nRemote on/off
nOutput voltage adjust: 90% to 110% of VO, nom
nOutput overvoltage protection
nUL* 1950 Recognized, CSA† C22.2 No. 950-95
Certified, VDE 0805 (EN60950, IEC950) Licensed
nCE mark meets 73/23/EEC and 93/68/EEC
directives‡
nWithin FCC and EN55022 (CISPR 22) Class A
radiated limits
Applications
nDistributed power architectures
nTelecommunications
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 out-
put 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.)
2Lineage Power
Advance Data Sheet
April 2008
36 Vdc to 75 Vdc Inputs; 25 W
LW025 Single-Output-Series Power Modules:
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.
* 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
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 fus-
ing 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.
Parameter Symbol Min Max Unit
Input Voltage:
Continuous
Transient (100 ms)
VI
VI, trans
0
0
80
100
Vdc
V
Operating Case Temperature (See Figure 16.) TC–40 110* °C
Storage Temperature Tstg –40 120 °C
I/O Isolation Voltage — — 1500 Vdc
Parameter Symbol Min Typ Max Unit
Operating Input Voltage VI36 48 75 Vdc
Maximum Input Current
(VI = 0 V to VI, max; IO = IO, max; see Figures 1 and 2.)
II, max ——1.2A
Inrush Transient i2t——0.1A
2s
Input Reflected-ripple Current
(50 Hz to 20 MHz; 12 µH source impedance,
TC = 25 °C; see Figure 10.)
II—3—mAp-p
Input Ripple Rejection (100 Hz—120 Hz) — — 60 — dB
Lineage Power 3
Advance Data Sheet
April 2008 36 Vdc to 75 Vdc Inputs; 25 W
LW025 Single-Output-Series Power Modules:
Electrical Specifications (continued)
Table 2. Output Specifications
Table 3. Isolation Specifications
General Specifications
Parameter Device Symbol Min Typ Max Unit
Output Voltage Set Point
(VI = 48 V; IO = IO, max; TC = 25 °C)
LW025F
LW025A
VO, set
VO, set
3.25
4.92
3.3
5.0
3.35
5.08
Vdc
Vdc
Output Voltage
(Over all line, load, and temperature conditions
until end of life; see Figure 12.)
LW025F
LW025A
VO
VO
3.17
4.85
—
—
3.43
5.15
Vdc
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
All
All
—
—
—
—
—
—
0.01
0.05
0.5
0.1
0.4
1.0
%VO
%VO
%VO
Output Ripple and Noise (See Figure 11.):
RMS
Peak-to-peak (5 Hz to 20 MHz)
All
All
—
—
—
—
—
20
40
100
mVrms
mVp-p
Output Current
(At IO < IO, min, the modules may exceed output
ripple specifications.)
All IO0.4 — 5.0 A
Output Current-limit Inception
(VO = 90% x VO, set; see Figures 3 and 4.)
All IO103 — 150 %IO, max
Output Short-circuit Current (VO = 250 mV) All IO—135200%IO, max
Efficiency
(VI = VI, nom; IO = IO, max; TC = 25 °C; see Figures 5,
6, and 12.)
LW025F
LW025A
η
η
75
77
77
79
—
—
%
%
Switching Frequency All — — 256 — kHz
Dynamic Response
(ýIO/ýt = 1 A/10 µs, 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)
All
All
All
All
—
—
—
—
—
—
—
—
1
0.5
1
0.5
—
—
—
—
%VO, set
ms
%VO, set
ms
Parameter Min Typ Max Unit
Isolation Capacitance — 0.002 — µF
Isolation Resistance 10 — — M¾
Parameter Min Typ Max Unit
Calculated MTBF (IO = 80% of IO, max; TC = 40 °C) 5,500,000 hours
Weight — — 54 (1.9) g (oz.)
4Lineage Power
Advance Data Sheet
April 2008
36 Vdc to 75 Vdc Inputs; 25 W
LW025 Single-Output-Series Power Modules:
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 Device Symbol Min Typ Max Unit
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)
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
µA
V
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)
All
All
All
All
Tdelay
Tdelay
Trise
—
—
—
—
—
27
2
1.5
—
50
10
3.0
5
ms
ms
ms
%
Output Voltage Set-point Adjustment Range All — 90 — 110 %VO,
nom
Output Overvoltage Protection (clamp) LW025F
LW025A
VO, clamp
VO, clamp
3.9
5.6
—
—
5.0
7.0
V
V
Advance Data Sheet
April 2008
Lineage Power 5
36 Vdc to 75 Vdc Inputs; 25 W
LW025 Single-Output-Series Power Modules:
Characteristics Curves
8-2233(C)
Figure 1. LW025F Typical Input Characteristics
8-1982(C).b
Figure 2. LW025A Typical Input Characteristics
8-2234(C)
Figure 3. LW025F Typical Output Characteristics
8-1983(C)
Figure 4. LW025A Typical Output Characteristics
10 20 30 40 50 60
0.0
INPUT VOLTAGE, V I (V)
0.8
INPUT CURRENT, II (A)
800
0.5
0.2
0.4
0.3
70
0.1
IO
IO = 2.5 A
IO
= 0.4 A
0.6
0.7
= 5 A
10 20 30 40 50 60
0.0
INPUT VOLTAGE, V
I (V)
0.8
0.6
INPUT CURRENT, II (A)
1.2
800
0.4
70
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)
80
2.0
0.5
1.5
1.0
7
VI = 36 V
VI = 48 V
VI = 75 V
2.5
3.0
123456
0
OUTPUT CURRENT, I
O (A)
4
3
OUTPUT VOLTAGE, V O (V)
6
70
2
1
5
VI = 48 V
VI = 36 V
VI = 75 V
66 Lineage Power
Advance Data Sheet
April 2008
36 Vdc to 75 Vdc Inputs; 25 W
LW025 Single-Output-Series Power Modules:
Characteristics Curves (continued)
8-2478(C)
Figure 5. LW025F Typical Converter Efficiency vs.
Output Current
8-1984(C)
Figure 6. LW025A Typical Converter Efficiency vs.
Output Current
8-1261(C).c
Figure 7. LW025A, F Typical Output Voltage for a
Step Load Change from 50% to 25%
8-1262(C)
Figure 8. LW025A, F Typical Output Voltage for a
Step Load Change from 50% to 75%
0.9 1.4 1.9 2.4 2.9 3.4
60
76
OUTPUT CURRENT, IO (A)
72
70
74
78
0.4
62
68
EFFICIENCY, η (%)
3.9 4.4 4.9
66
64
VI = 36 V
VI = 48 V
VI = 75 V
1.0 1.5 2.0 2.5 3.0 3.5
60
OUTPUT CURRENT, IO (A)
80
75
EFFICIENCY, η (%)
85
5.00.5
70
4.0 4.5
65
VI = 48 V
VI = 75 V
VI = 36 V
TIME, t (100 µs/div)
OUTPUT CURRENT, IO (A)
(1.25 A/div)
OUTPUT VOLTAGE, V O (V
(50 mV/div)
1.25A
2.5A
OUTPUT CURRENT, IO (A)
(1.25 A/div)
TIME, t (100 µs/div)
OUTPUT VOLTAGE, VO (V)
(50 mV/div)
2.5 A
3.75 A
Lineage Power 7
Advance Data Sheet
April 2008 36 Vdc to 75 Vdc Inputs; 25 W
LW025 Single-Output-Series Power Modules:
Characteristics Curves (continued)
8-1263(C).e
Figure 9. LW025A, F Typical Output Voltage Start-
Up when Signal Is Applied to Remote
On/Off
TIME, t (1 ms/div)
NORMALIZED
OUTPUT VOLTAGE, V O
0
5V
0
REMOTE ON/OFF,
Von/off (V) (2
V/div)
Test Configurations
8-203(C)
Note: Input reflected-ripple current is measured with a simulated
source impedance of 12 µH. Capacitor Cs offsets possible
battery impedance. Current is measured at the input of the
module.
Figure 10. Input Reflected-Ripple Test Setup
8-513(C)
Note: Use a 0.1 µF 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
8-204(C)
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 12. Output Voltage and Efficiency
Measurement Test Setup
TO OSCILLOSCOPE
12 µH
C
S
220 µF
IMPEDANCE < 0.1 Ω
@ 20 ˚C, 100 kHz
V
I
(+)
V
I
(-)
BATTERY 33 µF
CURRENT
PROBE
L
TEST
VO(+)
VO(-)
0.1 µF RESISTIVE
LOAD
SCOPE
COPPER STRIP
VI(+)
VI(-)
VO(+)
VO(-)
IIIO
SUPPLY
CONTACT RESISTANCE
CONTACT AND
DISTRIBUTION LOSSES
LOAD
ηVO(+) VO(–)–[]IO
VI(+) VI(–)–[]II
------------------------------------------------
⎝⎠
⎛⎞
100
×=%
88 Lineage Power
Advance Data Sheet
April 2008
36 Vdc to 75 Vdc Inputs; 25 W
LW025 Single-Output-Series Power Modules:
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 ac-
impedance input source. Highly inductive source
impedances can affect the stability of the power mod-
ule. 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 sta-
bility of the unit. For other highly inductive source
impedances, consult the factory for 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 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:
nThe input source is to be provided with reinforced
insulation from any other hazardous voltages, includ-
ing the ac mains; and
nOne VI pin and one VO pin are to be grounded or
both the input and output pins are to be kept floating;
and
nThe input pins of the module are not operator acces-
sible; and
nAnother 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.
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 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
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 Fig-
ure 13). A logic low is Von/off = –0.7 V to 1.2 V. The max-
imum 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 leak-
age current of the switch at Von/off = 6 V is 50 µA.
The module has internal capacitance to reduce noise
at the ON/OFF pin. Additional capacitance is not gen-
erally needed and may degrade the start-up character-
istics of the module.
Lineage Power 9
Advance Data Sheet
April 2008 36 Vdc to 75 Vdc Inputs; 25 W
LW025 Single-Output-Series Power Modules:
Feature Descriptions (continued)
Remote On/Off (continued)
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 ý%:
The adjusted output voltage cannot exceed 110% of the nominal output voltage between the VO(+) and VO(–) ter-
minal.
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.
Device a b c d –5% VO Radj-down +5% VO Radj-up
LW025F 14.0 51.1 5.2 2.7 111.7 k¾ 52.7 k¾
LW025A 4.02 16.9 2.01 2.0 19.3 k¾ 23.3 k¾
+
Ion/off
-
Von/off
REMOTE
ON/OFF
VI(+)
VI(-)
Radj-down cd 1 Δ%–()1–⋅[]
Δ%
------------------------------------------------ b–kΩ=
Radj-up a
dΔ⋅ %
-----------------b–kΩ=
1010 Lineage Power
Advance Data Sheet
April 2008
36 Vdc to 75 Vdc Inputs; 25 W
LW025 Single-Output-Series Power Modules:
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(+).
Thermal Considerations
Introduction
The LW025 Single-Output-Series Power Modules oper-
ate in a variety of thermal environments; however, suffi-
cient 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 Fig-
ure 14.
8-1265(C).c
Note: Dimensions are in millimeters and (inches). Pin locations are
for reference only.
Figure 14. Case Temperature Measurement
Location
Note that the view in Figure 14 is of the metal surface
of the module—the pin locations shown are for refer-
ence. 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 Informa-
tion table.
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 com-
ponents in the system. Therefore, the natural convec-
tion 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?
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.)
19.6
(0.77
TRIM
-
+
OUT
ON/OFF
NC
+
-
IN
LW025A871
DC-DC CONVERTER
MADE IN USA
IN:DC 36-75V, 1.20A
OUT:DC 5.0V, 5.0A
CASE PIN (OPTIONAL)
26.9
(1.06)
Lineage Power 11
Advance Data Sheet
April 2008 36 Vdc to 75 Vdc Inputs; 25 W
LW025 Single-Output-Series Power Modules:
Thermal Considerations (continued)
Heat Transfer (continued)
8-2477(C)
Note: Conversion factor for linear feet per minute to meters per
second: 200 ft./min. = 1 ms–1.
Figure 15. LW025F Forced Convection Power
Derating; Either Orientation
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
8-2479(C)
Figure 17. LW025F Power Dissipation vs. Output
Current, TA = 25 °C
8-1888(C).a
Figure 18. LW025A Power Dissipation vs. Output
Current, TA = 25 °C
50 60 70 80 90 100
0
4
MAX AMBIENT TEMPERATURE, TA (˚C)
2
1
3
40
POWER DISSIPATION PD (W)
110
MAX CASE
TEMPURATURE
1.0 ms -1 (600 ft./min.)
5
2.0 ms -1 (400 ft./min.)
3.0 ms -1 (200 ft./min.)
NATURAL
CONVECTION
50 60 70 80 90 100
0
MAX AMBIENT TEMPERATURE, T
A (˚C)
7
3
2
1
4
POWER DISSIPATION, PD (W)
9
11040
8
5
6
MAX CASE TEMPERATURE
2.0 ms-1 (400 ft./min.)
3.0 ms-1 (600 ft./min.)
1.0 ms-1 (200 ft./min.)
NATURAL CONVECTION
0.9 1.4 1.9 2.4 2.9 3.4
0
4
OUTPUT CURRENT, I
O
(A)
2
1
3
0.4
POWER DISSIPATION P
D
(W)
4.9
5
3.9 4.4
6
VI = 75 V
VI = 48 V
VI = 36 V
8
7
5
4
0
0.5 1 1.5 2 4.5 5
OUTPUT CURRENT, I
O (A)
POWER DISSIPATION, PD (W)
2.5 3 3.5 4
3
2
1
6VI = 75 V
VI = 48 V
VI = 36 V
1212 Lineage Power
Advance Data Sheet
April 2008
36 Vdc to 75 Vdc Inputs; 25 W
LW025 Single-Output-Series Power Modules:
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.
8-1126(C).d
Note: Dimensions are in millimeters and (inches).
Figure 19. Experimental Test Setup
Layout Considerations
Copper paths must not be routed beneath the power
module standoffs.
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED
BELOW THE
MODULE
AIRFLOW
13 (0.5)
FACING PWB
MODULE
76 (3.0)
PWB
Lineage Power 13
Advance Data Sheet
April 2008 36 Vdc to 75 Vdc Inputs; 25 W
LW025 Single-Output-Series Power Modules:
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.
8-1198(C).f2
Top View Pin Function
1Remote
On/Off
2 No Connec-
tion (sync fea-
ture optional)
3V
I(–)
4V
I(+)
5 Case Pin
(pin optional)
6Trim
7 – Output
8 + Output
Side View
Bottom View
14 Lineage Power
Advance Data Sheet
April 2008
36 Vdc to 75 Vdc Inputs; 25 W
LW025 Single-Output-Series Power Modules:
Recommended Hole Pattern
Component-side footprint. Dimensions are in millimeters and (inches).
8-1198(C).f
Ordering Information
Table 4. Device Codes
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 Lineage Power Account Manager or Field Applica-
tion Engineer for pricing and availability.
Table 5. Option Codes
Input Voltage Output Voltage Output Power Device Code Comcode
48 V 3.3 V 16.5 W LW025F 108448234
48 V 5 V 25 W LW025A TBD
Option Device Code Suffix
Short pins: 2.79 mm ± 0.25 mm
(0.110 in. ± 0.010 in.)
8
Case ground pin 7
Short pins: 3.68 mm ± 0.25 mm
(0.145 in. ± 0.010 in.)
6
Synchronization 3
Negative logic on/off 1
CASE OUTLINE
DRILL HOLE OF APPROX.
2.54 (0.100) DIAMETER
TO RECESS STANDOFFS
IF LOWER HEIGHT IS NEEDED
5.08
(0.200)
12.7
(0.50)
2.54 (0.100)
50.8 (2.00)
2.5
(0.10)
10.16
(0.400)
20.32
(0.800)
37.8
(1.49)
3.43
(0.135)
38.86
(1.530)
7.62 (0.300)
12.4
(0.49)
17.78
(0.700)
50.8
(2.00)
45.72 (1.800)
15.24
(0.600)
Lineage Power 15
Advance Data Sheet
April 2008 36 Vdc to 75 Vdc Inputs; 25 W
LW025 Single-Output-Series Power Modules:
Notes
Advance Data Sheet
April 2008
36 Vdc to 75 Vdc Inputs; 25 W
LW025 Single-Output-Series Power Modules:
April 2008
DS99-052EPS
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application. No rights under any patent accompany the sale of any such product(s) or information.
© 2008 Lineage Power Corporation, (Mesquite, Texas) All International Rights Reserved.
