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參數(shù)資料
| 型號(hào)： | JW100A |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Power Modules: dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W |
| 中文描述： | 電源模塊：型DC - DC轉(zhuǎn)換器，36至75伏直流電輸入，5伏直流電輸出，50瓦至150瓦 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 1036K |
| 代理商： | JW100A |
Tyco Electronics Corp
13
Data Sheet
July 1999
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A Power Modules:
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 26.
8-716 (C).f
Note: Top view, pin locations are for reference only.
Measurements shown in millimeters and (inches).
Figure 26. 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.
For additional information on these modules, refer to
the Thermal Management JC-, JFC-, JW-, and JFW-
Series 50 W to 150 W Board-Mounted Power Modules
Technical Note
(TN97-008EPS).
Heat Transfer Without Heat Sinks
Increasing airflow over the module enhances the heat
transfer via convection. Figure 27 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 27 is
shown in the following example.
Example
What is the minimum airflow necessary for a JW100A
operating at V
I
= 54 V, an output current of 20 A, and a
maximum ambient temperature of 40 °C
Solution
Given: V
I
= 54 V
I
O
= 20 A
T
A
= 40 °C
Determine P
D
(Use Figure 30.):
P
D
= 17 W
Determine airflow (v) (Use Figure 27.):
v = 2.0 m/s (400 ft./min.)
8-1150 (C).a
Figure 27. Forced Convection Power Derating with
No Heat Sink; Either Orientation
38.0 (1.50)
7.6 (0.3)
V
I
(–)
ON/OFF
CASE
+ SEN
TRIM
– SEN
V
I
(+)
V
O
(–)
V
O
(+)
MEASURE CASE
TEMPERATURE HERE
0
10
20
30
40
100
0
35
LOCAL AMBIENT TEMPERATURE, T
A
(
°
C)
P
D
25
20
10
90
80
70
60
50
4.0 m/s (800 ft./min.)
3.5 m/s (700 ft./min.)
0.1 m/s (NAT. CONV.)
(20 ft./min.)
0.5 m/s (100 ft./min.)
1.0 m/s (200 ft./min.)
1.5 m/s (300 ft./min.)
2.0 m/s (400 ft./min.)
2.5 m/s (500 ft./min.)
3.0 m/s (600 ft./min.)
5
15
30
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