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參數(shù)資料
| 型號： | FW250H1 |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 250 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 623K |
| 代理商： | FW250H1 |
16
Data Sheet
September 2001
36 Vdc to 75 Vdc Input, 24 Vdc Output; 250 W to 300 W
FW250H1 and FW300H1 Power Modules; dc-dc Converters:
Thermal Considerations (continued)
Heat Transfer with Heat Sinks (continued)
Example
If an 85 °C case temperature is desired, what is the
minimum airflow necessary? Assume the FW250H1
module is operating at nominal line and an output cur-
rent of 10 A, maximum ambient air temperature of
40 °C, and the heat sink is 1/2 inch.
Solution
Given: VI = 55 V
IO = 10 A
TA = 40 °C
TC = 85 °C
Heat sink = 1/2 inch.
PD = 28 W
Then solve the following equation:
1/2 inch heat sink. The minimum airflow necessary for
the FW250H1 module depends on heat sink fin orienta-
tion and is shown below:
s
1.25 m/s (250 ft./min.) (oriented along width)
s
1.5 m/s (300 ft./min.) (oriented along length)
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 27.
8-1304
Figure 27. 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.
EMC Considerations
For assistance with designing for EMC compliance,
please refer to the FLTR100V10 data sheet
(FDS01-043EPS)
Layout Considerations
Copper paths must not be routed beneath the power
module mounting inserts. For additional layout guide-
lines, refer to the FLTR100V10 data sheet
(FDS01-043EPS)
θca
TC
TA
–
()
PD
------------------------
=
θca
85
40
–
()
28
------------------------
=
θca
1.61 °C/W
=
PD
TC
TS
TA
θcs
θsa
θsa
TC
TA
–
()
PD
-------------------------
θcs
–
=
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