Data Sheet
April 2008
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 technology and deliver high-quality, compact, dc-dc
conversion at an economical price.
Applications
nComputer applications
nCommunications equipment
nDistributed power architectures
Options
nChoice of remote on/off logic
nShort pins
nSurface mountable
Features
nLow profile and small size:
50 mm x 50 mm x 8.5 mm
(1.969 in. x 1.969 in. x 0.335 in.)
nFixed frequency
nWide operating temperature range
nRemote on/off
nWide voltage adjustment (trim)
nOutput overcurrent protection
nOutput overvoltage protection
nOvertemperature protection
nISO*9001 and ISO14001 Certified manufacturing
facilities
nUL† 60950 Recognized, CSA‡ C22.2 No. 60950-00
Certified, VDE § 0805 (IEC60950) Licensed
nCE mark meets 73/23/EEC and 93/68/EEC
directives**
*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 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 followed. (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.
2Lineage Power
Data Sheet
April 2008
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 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 Typ Max Unit
Input Voltage:
Continuous
Transient (2 ms)
VI
VI, trans
0
0
—
—
80
100
Vdc
V
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 = IO, 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, max)
(See EMC Considerations section.)
Lineage Power 3
Data Sheet
April 2008 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
A
VO, 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.)
F
A
VO
VO
3.16
4.85
—
—
3.44
5.15
Vdc
Vdc
Output Regulation:
Line (VI = 36 V to 75 V)
Load (IO = IO, min to IO, max)
Temperature
(Tref = –40 °C to +110 °C)
All
All
All
—
—
—
—
—
—
0.05
0.05
0.5
0.2
0.2
1.0
%VO
%VO
%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
F
A
—
—
—
—
—
—
—
30
50
40
100
100
mVrms
mVp-p
mVp-p
External Load Capacitance
(total capacitance; electrolytic, tantalum, and
ceramic)
All — 0 — 470 µF
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% of VO, nom)
All IO, cli 5.15 — 7.5 A
Efficiency
(VI = 48 V; IO = IO, max; Tref = 25 °C; see Figures
5, 6, and 12.):
VO = 3.3 V
Trimmed down to 1.8 V
VO = 5 V
Trimmed down to 3.3 V
F
F
A
A
η
η
η
η
76
65
77
70
78
67
79
72
—
—
—
—
%
%
%
%
Switching Frequency All — — 295 — kHz
Dynamic Response
(ΔIO/Δt = 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
All
All
All
—
—
—
—
—
—
—
—
50
1
50
1
—
—
—
—
mV
ms
mV
ms
Parameter Min Typ Max Unit
Isolation Capacitance — 2 — nF
Isolation Resistance (250 Vdc) 10 — — M¾
4Lineage Power
Data Sheet
April 2008
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 Specifications
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
requirements state that solder balls must neither be loose nor violate the power module minimum electrical spacing.
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 assembly 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 Application Note
(AP97-021EPS).
Parameter Device
Suffix Min Typ Max Unit
Calculated MTBF
(IO = 80% of IO, max; TA = 20 °C)
F
A
8,500,000
5,000,000
hours
hours
Weight 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 state; see Figure 9.)
All
All
All
All
All
Von/off
Ion/off
Von/off
Ion/off
—
0
—
—
—
—
—
—
—
—
27
1.2
1.0
10
50
50
V
mA
V
µA
ms
Output Voltage Adjustment Range (trim) F
A
—
—
1.8
3.3
—
—
3.45
5.25
V
V
Output Overvoltage Protection (clamp) F
A
VO, clamp
VO, clamp
3.9
5.6
—
—
5
7
V
V
Lineage Power 5
Data Sheet
April 2008 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:
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 VOLTAGE, V
I (V)
0.8
INPUT CURRENT, II
(A)
800
0.5
0.2
0.4
0.3
70
0.1
IO = 5A
IO = 2.5A
IO = 0.4A
0.6
0.7
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, I
O (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, IO (A)
4
3
OUTPUT VOLTAGE, V O (V)
6
70
2
1
5
VI = 48 V
VI = 36 V
VI = 75 V
6Lineage Power
Data Sheet
April 2008
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 Change from 50% to 25%
8-1262
Figure 8. LUW025A, F Typical Output Voltage for a
Step Load Change from 50% to 75%
1 2 3 4
58
OUTPUT CURRENT, I
O (A)
76
84
0
60
68
72
EFFICIENCY, η (%)
5
VI = 36 V
VI = 75 V
80
1 2 3 4
58
OUTPUT CURRENT, I
O (A)
76
84
0
60
68
72
EFFICIENCY, η (%)
5
VI = 36 V
VI = 75 V
80
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, V O (V
)
(50 mV/div)
2.5A
3.75A
7
Lineage Power
Data Sheet
April 2008 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 offsets
possible battery impedance. Current is measured at the input
of the module.
Figure 10. Input Reflected-Ripple Test Setup
8-513d
Note: Use one external 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 terminals 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 VOLTAGE, V O
0
5V
0
REMOTE ON/OFF,
Von/off (V) (2
V/div)
TO OSCILLOSCOPE
12 µH
C
S
220 µF
ESR < 0.1 Ω
@ 20 ˚C, 100 kHz
V
I
(+)
V
I
(-)
BATTERY 33 µF
CURRENT
PROBE
L
TEST
1.0
μ
FRESISTIVE
SCOPE
COPPER STRIP
10
μ
FLOAD
V
O
(+)
V
O
(–)
VI(+)
VI(-)
VO(+)
VO(-)
I
IIO
SUPPLY
CONTACT RESISTANCE
CONTACT AND
DISTRIBUTION LOSSES
LOAD
ηVO(+) VO(–)–[]IO
VI(+) VI(–)–[]II
------------------------------------------------
⎝⎠
⎛⎞
100
×=%
8Lineage Power
Data Sheet
April 2008
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:
nThe input source is to be provided with reinforced
insulation from any other hazardous voltages, includ-
ing the ac mains.
nOne VI pin and one VO pin are to be grounded or
both the input and output pins are to be kept floating.
nThe input pins of the module are not operator acces-
sible.
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
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-preferred configura-
tion (see the Feature Specifications table).
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(–) terminal (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 power 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 Implementation
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(–) pin.
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(+)
Lineage Power 9
Data Sheet
April 2008 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:
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 fault 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 temperature, amount
of airflow, module power dissipation, and need for
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 during the operation of
the module. The output power 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
Δ%
----------6.11–
⎝⎠
⎛⎞
kΩ=
Radj-up VO5.11•()100 Δ%+()
1.225Δ%
--------------------------------------------------------------511
Δ%
----------
–6.11
–
⎝⎠
⎛⎞
kΩ=
RLOAD
Radj-up
VI(+)
ON/OFF
CASE
VI(–)
VO(+)
TRIM
VO(–)
1010 Lineage PowerLineage Power
Data Sheet
April 2008
36 Vdc to 75 Vdc In; 3.3 Vdc and 5 Vdc Out; 16.5 W and 25
LUW025-Series Power Modules: dc-dc Converters:
Draft Copy Only Lineage Power — Proprietary Use pursuant to 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
MEASURE HERE
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, I
O (A)
3.00
2.00
5.00
6.00
5.0
0
0.40
1.00
POWER DISSIPATION, PD (W)
4.00
2.00
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
Lineage Power 11
Data Sheet
April 2008 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:
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
For 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 ambient temperatures 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
0
4
3
10004030 90
1
2
50 60 70 80
5
6
LOCAL AMBIENT TEMPERATURE, T
A
(˚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
0
LOCAL AMBIENT TEMPERATURE, T
A
(˚C)
4
3
7
10004030 90
1
2
50 60 70 80
5
6
POWER DISSIPATION, P
D
(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
0
4
3
10004030 90
1
2
50 60 70 80
5
6
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
0
LOCAL AMBIENT TEMPERATURE, TA (˚C)
4
3
7
10004030 90
1
2
50 60 70 80
5
6
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 Lineage Power
Data Sheet
April 2008
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 FLTR100V10 Filter Module Data Sheet (DS99-294EPS).
V(+)
V(–)
POWER
COM
33 μF
100 V
0.47 μF
100 V
VI
3.3 mH COMMON-
MODE CHOKE
VO
(GROUNDED)
MODULE
100 nF CERAMIC
Lineage Power 13
Data Sheet
April 2008 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
2V
I(–)
3V
I(+)
4V
O(+)
5V
O(–)
6TRIM
1
2
34
5
6
50.0 (1.97) MAX
50.0
(1.97)
MAX
8.5
(0.335)
MAX
8.65
(0.34)
MAX
MATING PWB
SURFACE
WHEN ASSEMBLED ONTO
PWB, WITH AN HOLE
φ
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 Lineage Power
Data Sheet
April 2008
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 Pattern (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 Lineage Power 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
φ
1.5 (0.59)
6 PLACES
Data Sheet
April 2008
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:
April 2008
FDS01-032EPS (Replaces FDS01-031EPS)
World Wide Headquarters
Lineag e Po wer Co rporation
30 00 Skyline Drive, Mesquite, TX 75149, USA
+1-800-526-7819
(Outside U.S.A.: +1- 97 2-2 84 -2626)
www.l ine ag ep ower.co m
e-m ail: techsupport1@linea gepower.com
Asia-Pacific Headquart ers
Tel: +65 641 6 4283
Europe, Middle-East and Afric a He adquarters
Tel: +49 89 6089 286
India Headquarters
Tel: +91 80 28411633
Lineage Power 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
applic ation. 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.
