Data Sheet
November 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
Features
s
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**
s
s
s
s
s
s
The LUW025-Series Power Modules use advanced, surface-
mount technology and deliver high-quality, compact, dc-dc
conversion at an economical price.
s
s
Applications
s
s
s
s
Computer applications
Communications equipment
Distributed power architectures
s
Options
s
s
s
Choice of remote on/off logic
Short pins
Surface mountable
*
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.
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
Data Sheet
November 2001
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.
Parameter
Input Voltage:
Continuous
Transient (2 ms)
Operating Temperature
(See Thermal Considerations section.)
Storage Temperature
I/O Isolation Voltage (for 1 minute)
Symbol
V
I
V
I, trans
T
A
T
stg
—
Min
0
0
–40
–55
—
Typ
—
—
—
—
—
Max
80
100
75
125
1500
Unit
Vdc
V
°C
°C
Vdc
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
(V
I
= 0 to 75 V; I
O
= I
O, max
; see Figures
1 and 2.)
Inrush Transient
Input Reflected-ripple Current
(5 Hz to 20 MHz; 12 µH source impedance;
see Figure 10.)
Input Ripple Rejection
(100 Hz—120 Hz)
EMC, EN55022
(Nominal i/p volts, I
O
= I
O, max
)
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.
Symbol
V
I
I
I, max
Min
36
—
Typ
48
—
Max
75
1.36
Unit
Vdc
A
I
2
t
I
I
—
—
—
3
0.1
—
A
2
s
mAp-p
—
—
60
—
dB
(See EMC Considerations section.)
2
Tyco Electronics Corp.
Data Sheet
November 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
Electrical Specifications
(continued)
Table 2. Output Specifications
Parameter
Output Voltage Set Point
(V
I
= 48 V; I
O
= I
O, max
; T
ref
= 25 °C)
Output Voltage
(Over all operating input voltage, resistive
load, and temperature conditions until end of
life; see Figure 12.)
Output Regulation:
Line (V
I
= 36 V to 75 V)
Load (I
O
= I
O, min
to I
O, max
)
Temperature
(T
ref
= –40 °C to +110 °C)
Output Ripple and Noise Voltage:
(V
I
= 48 V; I
O
= I
O, 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)
External Load Capacitance
(total capacitance; electrolytic, tantalum, and
ceramic)
Output Current
(At I
O
< I
O, min
, the modules may exceed output
ripple specifications.)
Output Current-limit Inception
(V
O
= 90% of V
O, nom
)
Efficiency
(V
I
= 48 V; I
O
= I
O, max
; T
ref
= 25 °C; see Figures
5, 6, and 12.):
V
O
= 3.3 V
Trimmed down to 1.8 V
V
O
= 5 V
Trimmed down to 3.3 V
Switching Frequency
Dynamic Response
(∆I
O
/∆t = 1A/10 µs; V
I
= 48 V; T
ref
= 25 °C;
see Figures 7 and 8.):
Load Change from I
O
= 50% to 75% of I
O, max
:
Peak Deviation
Settling Time (V
O
< 10% of peak deviation)
Load Change from I
O
= 50% to 25% of I
O, max
:
Peak Deviation
Settling Time (V
O
< 10% of peak deviation)
Table 3. Isolation Specifications
Parameter
Isolation Capacitance
Isolation Resistance (250 Vdc)
Tyco Electronics Corp.
Min
—
10
Typ
2
—
Max
—
—
Unit
nF
M¾
3
Device
Suffix
F
A
F
A
Symbol
V
O, set
V
O, set
V
O
V
O
Min
3.25
4.92
3.16
4.85
Typ
3.30
5.00
—
—
Max
3.35
5.08
3.44
5.15
Unit
Vdc
Vdc
Vdc
Vdc
All
All
All
—
—
—
—
—
—
0.05
0.05
0.5
0.2
0.2
1.0
%V
O
%V
O
%V
O
All
F
A
All
—
—
—
—
—
—
—
0
—
30
50
—
40
100
100
470
mVrms
mVp-p
mVp-p
µF
All
I
O
0.4
—
5.0
A
All
I
O, cli
5.15
—
7.5
A
F
F
A
A
All
η
η
η
η
—
76
65
77
70
—
78
67
79
72
295
—
—
—
—
—
%
%
%
%
kHz
All
All
All
All
—
—
—
—
—
—
—
—
50
1
50
1
—
—
—
—
mV
ms
mV
ms
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
Data Sheet
November 2001
Electrical Specifications
(continued)
Table 4. General Specifications
Parameter
Calculated MTBF
(I
O
= 80% of I
O, max
; T
A
= 20 °C)
Weight
Table 5. Feature Specifications
Parameter
Remote On/Off Signal Interface
(V
I
= 0 V to 75 V; open collector or equiva-
lent compatible; signal referenced to V
I
(–)
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 I
on/off
= 1.0 mA
At V
on/off
= 0 V
Logic High:
At I
on/off
= 0 µA
Leakage Current
Turn-on Time
(At 80% of I
O, max
; V
O
within 10% of
steady state; see Figure 9.)
Output Voltage Adjustment Range (trim)
Output Overvoltage Protection (clamp)
Device
Suffix
Symbol
Min
Typ
Max
Unit
Device
Suffix
F
A
All
Min
Typ
8,500,000
5,000,000
—
Max
Unit
hours
hours
g (oz.)
—
28 (1)
All
All
All
All
All
V
on/off
I
on/off
V
on/off
I
on/off
—
0
—
—
—
—
—
—
—
—
27
1.2
1.0
10
50
50
V
mA
V
µA
ms
F
A
F
A
—
—
V
O, clamp
V
O, clamp
1.8
3.3
3.9
5.6
—
—
—
—
3.45
5.25
5
7
V
V
V
V
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).
4
Tyco Electronics Corp.
Data Sheet
November 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
Characteristic Curves
0.8
0.7
OUTPUT VOLTAGE, V
O
(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, I
O
(A)
V
I
= 75 V
V
I
= 48 V
V
I
= 36 V
INPUT CURRENT, I
I
(A)
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
10
20
30
40
50
60
I
O
= 5A
I
O
= 2.5A
I
O
= 0.4A
70
80
8-2234
INPUT VOLTAGE, V
I
(V)
8-2233
Figure 3. LUW025F Typical Output Characteristics
Figure 1. LUW025F Typical Input Characteristics
6
5
4
3
2
1
0
V
I
= 75 V
V
I
= 48 V
V
I
= 36 V
1.2
1.0
INPUT CURRENT, I
I
(A)
0.8
0.6
0.4
0.2
0.0
0
10
20
30
40
50
60
70
80
INPUT VOLTAGE, V
I
(V)
8-1982b
I
O
= 0.4 A
I
O
= 2.5 A
I
O
= 5 A
OUTPUT VOLTAGE, V
O
(V)
0
1
2
3
4
5
6
7
OUTPUT CURRENT, I
O
(A)
8-1983
Figure 4. LUW025A Typical Output Characteristics
Figure 2. LUW025A Typical Input Characteristics
Tyco Electronics Corp.
5
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