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參數(shù)資料
| 型號： | FW300A1 |
| 廠商： | LINEAGE POWER LLC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 300 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | MODULE-20 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 593K |
| 代理商： | FW300A1 |
Lineage Power
17
Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 250 W to 300 W
FW250A1 and FW300A1 Power Modules:
Thermal Considerations (continued)
Heat Transfer with Heat Sinks (continued)
Example
If an 85 °C case temperature is desired, what is the
minimum airow necessary? Assume the FW250A1
module is operating at VI = 54 V and an output current
of 50 A, maximum ambient air temperature of 40 °C,
and the heat sink is 1 inch.
Solution
Given: VI = 54 V
IO = 50 A
TA = 40 °C
TC = 85 °C
Heat sink = 1 inch
Determine PD by using Figure 29:
PD = 48 W
Then solve the following equation:
Use Figures 27 and 28 to determine air velocity for the
1 inch heat sink. The minimum airow necessary for
the FW250A1 module depends on heat sink n orienta-
tion and is shown below:
s
1.45 m/s (290 ft./min.) (oriented along width)
s
1.85 m/s (370 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
θsa) as shown in Figure 31.
8-1304(C)
Figure 31. 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-
dened application environment, a more accurate
model, including heat transfer from the sides and bot-
tom of the module, can be used. This equation provides
a conservative estimate for such instances.
EMC Considerations
For assistance with designing for EMC compliance,
please refer to the FLTR100V10 data sheet
(DS99-294EPS).
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
(DS99-294EPS).
θca
TC
TA
–
()
PD
------------------------
=
θca
85
40
–
()
48
------------------------
=
θca 0.94 °C/W
=
PD
TC
TS
TA
cs
sa
θsa
TC
TA
–
()
PD
-------------------------
θcs
–
=
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