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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)： | 10/16頁 |
| 文件大小： | 373K |
| 代理商： | HW125F |
10
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
Feature Descriptions
(continued)
Output Overvoltage Protection
The output overvoltage protection consists of circuitry
that monitors the voltage on the output terminals. If the
voltage on the output terminals exceeds the overvolt-
age protection threshold, then the module will shut
down and latch off. The overvoltage latch is reset by
either cycling the input power for one second or by
toggling the ON/OFF pin for one second.
Overtemperature Protection
To provide protection in a fault condition, the unit is
equipped with a thermal shutdown circuit. The shut-
down circuit will not engage unless the unit is operated
above the maximum device temperature. Recovery for
the thermal shutdown is accomplished by cycling the
dc input power off for at least one second or toggling
the primary referenced on/off signal for at least one
second.
Thermal Considerations
Introduction
The power modules operate in a variety of thermal
environments; however, sufficient cooling should be
provided to help ensure reliable operation of the unit.
Heat is removed by convection and radiation to the sur-
rounding environment.
The thermal data presented is based on measure-
ments taken in a wind tunnel. The test setup shown in
Figure 16 was used to collect data for Figures 22 and
23. Note that the orientation of the module with respect
to airflow affects thermal performance. Two orientations
are shown in Figures 17 and 18.
8-1199(C).d
Note: Dimensions are in millimeters and (inches).
Figure 16. Thermal Test Setup
8-1508(C)
Figure 17. Best Orientation (Top View)
AIRFLOW
203.2 (8.0)
76.2 (3.0)
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED HERE
POWER MODULE
25.4 (1.0)
AIRFLOW
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