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參數(shù)資料
| 型號(hào)： | FW150F9 |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 99 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 1150K |
| 代理商： | FW150F9 |
Tyco Electronics Corp.
11
Data Sheet
September 1997
dc-dc Converter; 36 to 72 Vdc Input, 3.3 Vdc Output; 99 W
FW150F Power Module:
Thermal Considerations (continued)
Heat Transfer with Heat Sinks (continued)
8-696 (C).a
Figure 19. Heat Sink Resistance Curves; Fins
Oriented Along Width
8-697 (C).a
Figure 20. Heat Sink Resistance Curves; Fins
Oriented Along Length
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 Figure 19 and
Figure 20 had a thermal-conductive dry pad between
the case and the heat sink to minimize contact resis-
tance.
To choose a heat sink, determine the power dissipated
as heat by the unit for the particular application.
Figure 21 shows typical heat dissipation for a range of
output currents and three voltages for the FW150F.
8-924 (C)
Figure 21. Power Dissipation as Heat vs. Output
Current
Example
If an 85 °C case temperature is desired, what is the
minimum airow necessary? Assume the FW150F
module is operating at nominal line and an output cur-
rent of 20 A, maximum ambient air temperature of
40 °C, and the heat sink is 0.5 inch.
Solution
Given: VI = 54 V
IO = 20 A
TA = 40 °C
TC = 85 °C
Heat sink = 0.5 inch.
PD = 20 W
Then solve the following equation:
for the 0.5 inch heat sink. The minimum airow neces-
sary for the FW150F module depends on heat sink n
orientation and is shown below:
s
0.25 m/s (50 ft./min.) (oriented along width)
s
0.30 m/s (60 ft./min.) (oriented along length)
5.0
4.0
3.0
2.0
1.0
0.0
NAT
CONV
0.5
(100)
1.0
(200)
1.5
(300)
2.0
(400)
2.5
(500)
THERMAL
RESISTANCE,
(
°C/W)
AIR VELOCITY MEASURED IN m/s (ft./min.)
NO HEAT SINK
0.5 in. HEAT SINK
1 in. HEAT SINK
0.25 in. HEAT SINK
5.0
4.0
3.0
2.0
1.0
0.0
NAT
CONV
0.5
(100)
1.0
(200)
1.5
(300)
2.0
(400)
2.5
(500)
THERMAL
RESISTANCE,
(
°C/W)
AIR VELOCITY MEASURED IN m/s (ft./min.)
NO HEAT SINK
0.5 in. HEAT SINK
1 in. HEAT SINK
0.25 in. HEAT SINK
VI = 36 V
VI = 54 V
VI = 72 V
0
5
10
15
20
25
30
0
5
10
15
POWER
DISSIPATION,
P
D
(W)
20
25
30
40
OUTPUT CURRENT, IO (A)
35
θca
TC
TA
–
()
PD
------------------------
=
θca
85
40
–
()
20
------------------------
=
θca 2.25 °C/W
=
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