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參數(shù)資料
| 型號(hào)： | FW300A1-A |
| 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)： | 5/20頁 |
| 文件大小： | 796K |
| 代理商： | FW300A1-A |
Lineage Power
13
Data Sheet
April 2008
36 Vdc to 75 Vdc Input, 5 Vdc Output; 300 W
FW300A1-A Power Module; dc-dc Converter:
Thermal Considerations (continued)
Heat Transfer with Heat Sinks (continued)
8-1321 (C)
Figure 20. Case-to-Ambient Thermal Resistance
Curves; Transverse Orientation
8-1320 (C)
Figure 21. Case-to-Ambient Thermal Resistance
Curves; Longitudinal Orientation
These measured resistances are from heat transfer
from the sides and bottom of the module as well as the
top side with the attached heat sink; therefore, the
case-to-ambient thermal resistances shown are gener-
ally lower than the resistance of the heat sink by itself.
The module used to collect the data in Figures 20 and
21 had a thermal-conductive dry pad between the case
and the heat sink to minimize contact resistance.
To choose a heat sink, determine the power dissipated
as heat by the unit for the particular application.
Figure 17 shows typical heat dissipation for a range of
output currents and three voltages for the FW300A1-A.
Example
If an 85 °C case temperature is desired, what is the
minimum airow necessary? Assume the FW300A1-A
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
PD = 48 W
Then solve the following equation:
1 inch heat sink. The minimum airow necessary for
this module depends on heat sink n orientation and is
shown below:
s
1.5 m/s (300 ft./min.) (transverse airow)
s
1.75 m/s (350 ft./min.) (longitudinal airow)
0.0
0.5
3.0
3.5
4.0
4.5
2.5
2.0
1.0
1 1/2 IN. HEAT SINK
1 IN. HEAT SINK
1/2 IN. HEAT SINK
1/4 IN. HEAT SINK
NO HEAT SINK
1.5
AIR VELOCITY, m/s (ft./min.)
0
0.5
(100)
1.0
(200)
1.5
(300)
2.0
(400)
2.5
(500)
3.0
(600)
CASE-TO-AMBIENT
THERMAL
RESISTANCE,
θCA
(
°C/W)
0
0.5
(100)
1.0
(200)
1.5
(300)
2.0
(400)
2.5
(500)
3.0
(600)
0.0
0.5
3.0
3.5
4.0
4.5
2.5
2.0
1.0
1 1/2 IN. HEAT SINK
1 IN. HEAT SINK
1/2 IN. HEAT SINK
1/4 IN. HEAT SINK
NO HEAT SINK
1.5
AIR VELOCITY, m/s (ft./min.)
CASE-TO-AMBIENT
THERMAL
RESISTANCE,
θCA
(
°C/W)
θca
TC TA
–
()
PD
-----------------------
=
θca
85 40
–
()
48
-----------------------
=
θca 0.94 °C/W
=
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