Data Sheet
April 2008
FW250A1 and FW300A1 Power Modules:
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 250 W to 300 W
Features
n
Size: 61.0 mm x 116.8 mm x 13.5 mm
(2.40 in. x 4.60 in. x 0.53 in.)
Wide input voltage range
High efficiency: 84% typical
Parallel operation with load sharing
Output voltage set-point adjustment (trim)
Overtemperature protection
Synchronization
Power good signal
Output current monitor
Output overvoltage and overcurrent protection
Remote sense
Remote on/off
Constant frequency
Case ground pin
Input-to-output isolation
ISO*
9001 Certified manufacturing facilities
UL
†
1950 Recognized,
CSA
‡
C22.2 No. 950-95
Certified, and VDE 0805 (EN60950, IEC950)
Licensed
CE mark meets 73/23/EEC and 93/68/EEC direc-
tives
§
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The FW250A1 and FW300A1 Power Modules use advanced,
surface-mount technology and deliver high-quality, compact,
dc-dc conversion at an economical price.
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Applications
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Redundant and distributed power architectures
Computer equipment
Communications equipment
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Options
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Heat sinks available for extended operation
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Description
The FW250A1 and FW300A1 Power Modules are dc-dc converters that operate over an input voltage range of
36 Vdc to 75 Vdc and provide a precisely regulated dc output. The outputs are fully isolated from the inputs,
allowing versatile polarity configurations and grounding connections. The modules have maximum power rat-
ings from 250 W to 300 W at a typical full-load efficiency of 84%.
Two or more modules may be paralleled with forced load sharing for redundant or enhanced power applications.
The package, which mounts on a printed-circuit board, accommodates a heat sink for high-temperature
applications.
*
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 Assn.
§ 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.)
FW250A1 and FW300A1 Power Modules:
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 250 W to 300
Data Sheet
April 2008
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 (100 ms)
I/O Isolation Voltage (for 1 minute)
Operating Case Temperature
(See Thermal Considerations section and
Figure 24.)
Storage Temperature
Symbol
V
I
V
I, trans
—
T
C
Min
—
—
—
–40
Max
80
100
1500
100
Unit
Vdc
V
V
°C
T
stg
–55
125
°C
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 V to 75 V):
FW250A1
FW300A1
Inrush Transient
Input Reflected-ripple Current, Peak-to-peak
(5 Hz to 20 MHz, 12 µH source impedance;
see Figure 14.)
Input Ripple Rejection (120 Hz)
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 20 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
I
I, max
i
2
t
I
I
Min
36
—
—
—
—
Typ
48
—
—
—
10
Max
75
10
12
2.0
—
Unit
Vdc
A
A
A
2
s
mAp-p
—
—
60
—
dB
2
Lineage Power
Data Sheet
April 2008
FW250A1 and FW300A1 Power Modules:
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 250 W to 300
Electrical Specifications
(continued)
Table 2. Output Specifications
Parameter
Output Voltage Set Point
(V
I
= 48 V; I
O
= I
O, max
; T
C
= 25 °C)
Output Voltage
(Over all operating input voltage, resistive load,
and temperature conditions until end of life; see
Figure 16 and Feature Descriptions.)
Output Regulation:
Line (V
I
= 36 V to 75 V)
Load (I
O
= I
O, min
to I
O, max
)
Temperature (T
C
= –40 °C to +100 °C)
Output Ripple and Noise Voltage
(See Figures 7, 8, and 15.):
RMS
Peak-to-peak (5 Hz to 20 MHz)
External Load Capacitance
Output Current (At I
O
< I
O, min
, the modules may
exceed output ripple specifications.):
FW250A1
FW300A1
Output Current-limit Inception
(V
O
= 90% of V
O, set
; see Feature Descriptions.)
Output Short-circuit Current
(V
O
= 1.0 V; indefinite duration, no hiccup mode;
see Figures 3 and 4.)
Efficiency (V
I
= 48 V; I
O
= I
O, max
; T
C
= 25 °C;
see Figures 5, 6, and 16.):
FW250A1
FW300A1
Switching Frequency
Dynamic Response
(½I
O
/½t = 1 A/10 µs, V
I
= 48 V, T
C
= 25 °C; tested
with a 10 µF aluminum and a 1.0 µF ceramic
capacitor across the load; see Figures 9—12.):
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)
Symbol
V
O, set
V
O
Min
4.92
4.85
Typ
5.0
—
Max
5.08
5.15
Unit
Vdc
Vdc
—
—
—
—
—
—
0.01
0.05
15
0.1
0.2
50
%V
O
%V
O
mV
—
—
—
—
—
0
—
—
—
40
150
*
mVrms
mVp-p
µF
I
O
I
O
I
O, cli
—
0.5
0.5
103
—
—
—
—
—
50
60
130
†
150
A
A
%I
O, max
%I
O, max
η
η
All
—
—
—
84
84
500
—
—
—
%
%
kHz
—
—
—
—
—
—
—
—
150
200
150
200
—
—
—
—
mV
µs
mV
µs
* Consult your sales representative or the factory.
† These are manufacturing test limits. In some situations, results may differ.
Lineage Power
3
FW250A1 and FW300A1 Power Modules:
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 250 W to 300
Data Sheet
April 2008
Electrical Specifications
(continued)
Table 3. Isolation Specifications
Parameter
Isolation Capacitance
Isolation Resistance
Min
—
10
Typ
1700
—
Max
—
—
Unit
pF
M¾
General Specifications
Parameter
Calculated MTBF (I
O
= 80% of I
O, max
; T
C
= 40 °C)
Weight
—
Min
Typ
1,700,000
—
200 (7)
Max
Unit
hours
g (oz.)
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions. See Feature Descriptions for further information.
Table 4. Feature Specifications
Parameter
Remote On/Off Signal Interface
(V
I
= 0 V to 75 V; open collector or equivalent
compatible; signal referenced to V
I
(–) terminal; see
Figure 17 and Feature Descriptions.):
Logic Low—Module On
Logic High—Module Off
Logic Low:
At I
on/off
= 1.0 mA
At V
on/off
= 0.0 V
Logic High:
At I
on/off
= 0.0 µA
Leakage Current
Turn-on Time
(I
O
= 80% of I
O, max
; V
O
within ±1% of steady state)
Output Voltage Overshoot
Output Voltage Adjustment (See Feature Descriptions.):
Output Voltage Remote-sense Range
Output Voltage Set-point Adjustment Range (trim)
Output Overvoltage Protection
Output Current Monitor (I
O
= I
O, max
, T
C
= 70 °C)
* These are manufacturing test limits. In some situations, results may differ.
Symbol
Min
Typ
Max
Unit
V
on/off
I
on/off
V
on/off
I
on/off
—
—
—
—
—
I
O, mon
0
—
—
—
—
—
—
60
6.0*
—
—
—
—
—
30
0
—
—
—
0.065
1.2
1.0
15
50
50
5
0.7
114
7.0*
—
V
mA
V
µA
ms
%V
O, set
V
%V
O, nom
V
V/A
4
Lineage Power
Data Sheet
April 2008
FW250A1 and FW300A1 Power Modules:
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 250 W to 300
Feature Specifications
Table 4. Feature Specifications
(continued)
Parameter
Synchronization:
Clock Amplitude
Clock Pulse Width
Fan-out
Capture Frequency Range
Overtemperature Protection
(See Figure 24.)
Forced Load Sharing Accuracy
Power Good Signal Interface
(See Feature Descriptions.):
Low Impedance—Module Operating
High Impedance—Module Off
Symbol
—
—
—
—
T
C
—
Min
4.00
0.4
—
425
—
—
Typ
—
—
—
—
105
10
Max
5.00
—
1
575
—
—
Unit
V
µs
—
kHz
°C
%I
O, rated
R
pwr/good
I
pwr/good
R
pwr/good
V
pwr/good
—
—
1
—
—
—
—
—
100
1
—
40
¾
mA
M¾
V
Solder, Cleaning, and Drying Considerations
Post solder cleaning is usually the final circuit-board assembly process prior to electrical testing. The result of inad-
equate 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).
Lineage Power
5
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