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參數(shù)資料
| 型號： | JAW050A1 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 359K |
| 代理商： | JAW050A1 |
10
Lucent Technologies Inc.
Advance Data Sheet
May 1999
dc-dc Converters; 36 Vdc to 75 Vdc Input, 5 Vdc Output; 50 W to 75 W
JAW050A and JAW075A 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 try to restart. The unit will continue in this
condition until the cause of the overvoltage condition is
removed.
Overtemperature Protection
These modules feature an overtemperature protection
circuit to safeguard against thermal damage. The cir-
cuit shuts down when the maximum case temperature
is exceeded. The module will automatically restart
when the case temperature cools sufficiently.
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
occurs at the position indicated in Figure 18.
C
)
8-716(C).h
Note: Top view, pin locations are for reference only. Measurements
shown in millimeters and (inches).
Figure 18. 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. Figures 21 and 22 show the
maximum power that can be dissipated by the module
without exceeding the maximum case temperature ver-
sus local ambient temperature (T
tion through 4 m/s (800 ft./min.). Note that the thermal
performance is orientation dependent. Longitudinal ori-
entation occurs when the long direction of the module
is parallel to the airflow, whereas transverse orientation
occurs when the short direction of the module is paral-
lel to the airflow.
A
) for natural convec-
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
JAW075A1 operating at V
15 A, longitudinal orientation, and a maximum ambient
temperature of 55
°
C
I
= 55 V, an output current of
Solution
Given: V
I
= 55 V
I
O
= 15 A
T
A
= 55
°
C
Determine P
D
(Use Figure 20.):
P
D
= 14 W
Determine airflow (v) (Use Figure 21.):
v = 2.3 m/s (460 ft./min.)
MEASURE CASE
TEMPERATURE HERE
V
I
(–)
ON/OFF
CASE
+SEN
TRIM
–SEN
V
I
(+)
V
O
(–)
V
O
(+)
30.5
(1.20)
29.0
(1.14)
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