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參數(shù)資料
| 型號： | HW125F |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 12/16頁 |
| 文件大小： | 373K |
| 代理商： | HW125F |
12
Lucent Technologies Inc.
HW125F Power Modules; dc-dc Converters:
36 Vdc to 75 Vdc Input, 3.3 Vdc Output; 83.5 W
Data Sheet
August 2000
Thermal Considerations
(continued)
Convection Requirements for Cooling
(continued)
With the known heat dissipation, module orientation
with respect to airflow, and the local ambient tempera-
ture, the minimum airflow can be chosen from the der-
ating curves in Figures 22 and 23.
8-3005(C)
Figure 22. HW125F1 Power Derating vs. Local
Ambient Temperature and Air Velocity;
Best Orientation
8-3006(C)
Figure 23. HW125F1 Power Derating vs. Local
Ambient Temperature and Air Velocity;
Worst Orientation
For example, if the HW125F1 dissipates 13 W of heat
at 25 A full load and nominal line voltage, the minimum
airflow for best module orientation in a 50
ment is 0.6 m/s (120 ft./min.).
°
C environ-
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 19 and 20 to ensure it
does not exceed the critical temperatures at those
locations.
Solder, Cleaning, and Drying Consider-
ations
Post solder cleaning is usually the final circuit-board
assembly process prior to electrical board testing. The
result of inadequate circuit-board cleaning and drying
can affect both the reliability of a power module and the
testability of the finished circuit-board assembly. For
guidance on appropriate soldering, cleaning, and dry-
ing procedures, refer to Lucent Technologies
Mounted Power Modules: Soldering and Cleaning
Application Note (AP97-021EPS).
Board-
EMC Considerations
For assistance with designing for EMC compliance,
refer to the
FLTR100V10 Filter Module
(DS99-294EPS).
Data Sheet
Layout Considerations
Copper paths must not be routed beneath the power
module standoffs. For additional layout guidelines, refer
to the
FLTR100V10 Filter Module
294EPS).
Data Sheet (DS99-
12.0
4.0
60
50
90 100
0
10
20
30
40
70
80
0.0
10.0
LOCAL AMBIENT TEMPERATURE, T
A
(
°
C)
8.0
2.0
14.0
P
D
6.0
3.0 m/s (600 ft./min.)
2.5 m/s (500 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
12.0
4.0
60
50
90 100
0
10
20
30
40
70
80
0.0
10.0
LOCAL AMBIENT TEMPERATURE, T
A
(
°
C)
8.0
2.0
14.0
P
D
6.0
3.0 m/s (600 ft./min.)
2.5 m/s (500 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
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