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参数资料
| 型号： | LUW025A8 |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 25 W DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 3/15页 |
| 文件大小： | 700K |
| 代理商： | LUW025A8 |
Tyco Electronics Corp.
11
Data Sheet
November 2001
36 Vdc to 75 Vdc In; 3.3 Vdc and 5 Vdc Out; 16.5 W and 25 W
LUW025-Series Power Modules: dc-dc Converters:
Thermal Considerations (continued)
Convection Requirements for Cooling
(continued)
8-2980
Figure 21. LUW025F Power Derating vs. Local
Ambient Temperature and Air Velocity;
Orientation 1 (Preliminary)
8-2981
Figure 22. LUW025A Power Derating vs. Local
Ambient Temperature and Air Velocity;
Orientation 1
8-2979
Figure 23. LUW025F Power Derating vs. Local
Ambient Temperature and Air Velocity;
Orientation 2 (Preliminary)
8-2982
Figure 24. LUW025A Power Derating vs. Local
Ambient Temperature and Air Velocity;
Orientation 2
For example, if the LUW025A dissipates 3 W of heat at
2.7 A load, the minimum airflow for Orientation 1 in a
80 °C environment is 1.0 m/s (200 ft./min.).
Keep in mind that these derating curves are approxi-
mations of the ambient temperatures and airflows
required to keep the power module temperature below
its maximum rating. Once the module is assembled in
the actual system, the module’s temperature should be
checked as shown in Figures 17—18 to ensure it does
not exceed 110 °C.
10
20
0
4
3
100
040
30
90
1
2
50
60
70
80
5
6
LOCAL AMBIENT TEMPERATURE, TA (C)
3.0 m/s (600 ft./min.)
2.0 m/s (400 ft./min.)
1.5 m/s (300 ft./min.)
1.0 m/s (200 ft./min.)
0.5 m/s (100 ft./min.)
NATURAL
CONVECTION
PO
WER
DISSIP
A
TION,
P
D
(W)
10
20
0
LOCAL AMBIENT TEMPERATURE, TA (C)
4
3
7
100
040
30
90
1
2
50
60
70
80
5
6
PO
WER
DISSIP
A
TION,
P
D
(W)
3.0 m/s (600 ft./min.)
2.0 m/s (400 ft./min.)
1.5 m/s (300 ft./min.)
1.0 m/s (200 ft./min.)
0.5 m/s (100 ft./min.)
NATURAL
CONVECTION
10
20
0
4
3
100
040
30
90
1
2
50
60
70
80
5
6
LOCAL AMBIENT TEMPERATURE, TA (C)
3.0 m/s (600 ft./min.)
2.0 m/s (400 ft./min.)
1.5 m/s (300 ft./min.)
1.0 m/s (200 ft./min.)
0.5 m/s (100 ft./min.)
NATURAL
CONVECTION
PO
WER
DISSIP
A
TION,
P
D
(W)
10
20
0
LOCAL AMBIENT TEMPERATURE, TA (C)
4
3
7
100
040
30
90
1
2
50
60
70
80
5
6
3.0 m/s (600 ft./min.)
2.0 m/s (400 ft./min.)
1.5 m/s (300 ft./min.)
1.0 m/s (200 ft./min.)
0.5 m/s (100 ft./min.)
NATURAL
CONVECTION
PO
WER
DISSIP
A
TION,
P
D
(W)
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