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參數(shù)資料
| 型號： | FW400R61-18 |
| 廠商： | LINEAGE POWER LLC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 392 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | MODULE-20 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 412K |
| 代理商： | FW400R61-18 |
14
Lineage Power
Data Sheet
April 03, 2008
36 Vdc to 75 Vdc Input, 28 Vdc Output; 400 W
FW400R1 Power Module; dc-dc Converter:
Thermal Considerations (continued)
Heat Transfer with Heat Sinks (continued)
Figure 19 shows typical heat dissipation for a range of
output currents and three voltages for the FW400R1.
1-0171
Figure 19. FW400R1 Power Dissipation vs. Output
Current at 25 °C
Custom Heat Sinks
A more detailed model can be used to determine the
required thermal resistance of a heat sink to provide
necessary cooling. The total module resistance can be
separated into a resistance from case-to-sink (
θcs) and
sink-to-ambient (
θsa) as shown in Figure 20.
8-1304 (F).e
Figure 20. Resistance from Case-to-Sink and Sink-
to-Ambient
For a managed interface using thermal grease or foils,
a value of
θcs = 0.1 °C/W to 0.3 °C/W is typical. The
solution for heat sink resistance is:
This equation assumes that all dissipated power must
be shed by the heat sink. Depending on the user-
defined application environment, a more accurate
model, including heat transfer from the sides and bot-
tom of the module, can be used. This equation pro-
vides a conservative estimate for such instances.
OUTPUT CURRENT, IO (A)
PO
WER
DISSAP
A
TION,
P
D
(W)
1.43
3.43
5.43
7.43
9.43 11.43 13.43
50
45
40
35
30
25
20
15
10
5
0
VI = 75 V
VI = 54 V
VI = 36 V
PD
TC
TS
TA
θcs
θsa
θsa
TC
TA
–
()
PD
-------------------------
θcs
–
=
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