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參數(shù)資料
| 型號： | JAHW075A |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 345K |
| 代理商： | JAHW075A |
Lucent Technologies Inc.
11
Data Sheet
June 2000
dc-dc Converters; 36 Vdc to 75 Vdc Input, 5 Vdc Output; 50 W to 75 W
JAHW050A and JAHW075A Power Modules:
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 attempt to restart.
Overtemperature Protection
To provide protection in a fault condition, the unit is
equipped with an overtemperature circuit. In a event of
such a fault, the module enters into an auto-restart
“hiccup” mode with low output voltage until the fault is
removed. Recovery from the overtemperature protec-
tion is automatic after the unit cools below the overtem-
perature protection threshold.
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-dissipating components inside the unit are ther-
mally coupled to the case. Heat is removed by conduc-
tion, convection, and radiation to the surrounding
environment. Proper cooling can be verified by mea-
suring the case temperature. Peak temperature (T
C
)
occurs at the position indicated in Figure 20.
8-716 (F).h
Note: Top view, pin locations are for reference only. Measurements
shown in millimeters and (inches).
Figure 20. Case Temperature Measurement
Location
The temperature at this location should not exceed
100 °C. The output power of the module should not
exceed the rated power for the module as listed in the
Ordering Information table.
Although the maximum case temperature of the power
modules is 100 °C, you can limit this temperature to a
lower value for extremely high reliability.
Heat Transfer Without Heat Sinks
Increasing airflow over the module enhances the heat
transfer via convection. Figure 21 shows the maximum
power that can be dissipated by the module without
exceeding the maximum case temperature versus local
ambient temperature (T
A
) for natural convection
through 4 m/s (800 ft./min.).
Note that the natural convection condition was mea-
sured at 0.05 m/s to 0.1 m/s (10 ft./min. to 20 ft./min.);
however, systems in which these power modules may
be used typically generate natural convection airflow
rates of 0.3 m/s (60 ft./min.) due to other heat dissipat-
ing components in the system. The use of Figure 21 is
shown in the following example.
Example
What is the minimum airflow necessary for a
JAHW075A operating at V
I
= 55 V, an output current of
15 A, and a maximum ambient temperature of 55 °C
Solution
Given: V
I
= 55 V
I
O
= 15 A
T
= 55 °C
Determine P
D
(Use Figure 23.):
P
D
= 8 W
Determine airflow (v) (Use Figure 21.):
v = 0.5 m/s (100 ft./min.)
MEASURE CASE
TEMPERATURE HERE
ON/OFF
CASE
+ SEN
TRIM
– SEN
29.0
(1.14)
30.5
(1.20)
V
O
(+)
V
O
(–)
V
I
(+)
V
I
(–)
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| JAHW075F1Z | 功能描述:DC/DC轉(zhuǎn)換器 48Vin 3.3Vout 50W RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| JAHW075S6R5 | 制造商:GE Energy 功能描述: |
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