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参数资料
| 型号： | FC250B1 |
| 厂商： | LINEAGE POWER LLC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 250 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | MODULE-14 |
| 文件页数： | 7/20页 |
| 文件大小： | 752K |
| 代理商： | FC250B1 |
Lineage Power
15
Data Sheet
April 2008
18 Vdc to 36 Vdc Input, 12 Vdc Output; 250 W
FC250B1 Power Module: dc-dc Converter;
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 FC250B1
module is operating at VI = 28 V and an output current
of 20 A, maximum ambient air temperature of 40 °C,
and the heat sink is 1 inch.
Solution
Given:
VI = 28 V
IO = 20 A
TA = 40 °C
TC = 85 °C
Heat sink = 1 inch
Determine PD by using Figure 23:
PD = 47 W
Then solve the following equation:
1 inch heat sink. The minimum airflow necessary for
this module depends on heat sink fin orientation and is
shown below:
n
1.4 m/s (280 ft./min.) (oriented along width)
n
1.8 m/s (360 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 24.
8-1304 (C)
Figure 24.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
(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
–
()
47
----------------------
=
θca
0.96 °C/W
=
PD
TC
TS
TA
θcs
θsa
→
θsa
TC TA
–
()
PD
-------------------------
θcs
–
=
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