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参数资料
| 型号： | AEH20G48-8 |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 50 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | 2.400 X 2.280 INCH, 0.500 INCH HEIGHT, HALF BRICK PACKAGE-9 |
| 文件页数： | 24/35页 |
| 文件大小： | 409K |
| 代理商： | AEH20G48-8 |
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-30-
USA
Europe
Asia
TEL:
1-760-930-4600
44-(0)1384-842-211
852-2437-9662
FAX:
1-760-930-0698
44-(0)1384-843-355
852-2402-4426
www.astec.com
lb). A thermally conductive dry pad or thermal
grease is placed between the case and the
heat sink to minimize contact resistance (typi-
cally 0.1° C/W to 0.3° C/W) and temperature dif-
ferential.
Nomenclature for heat sink configurations is as
follows:
WDxyyy40
where:
x = fin orientation: longitudinal (L) or trans
verse (T)
yyy = heat sink height (in 100ths of inch)
For example, WDT5040 is a heat sink that is
transverse mounted (see Figure 31) for a 61
mm x 57.9 mm (2.4 in.x 2.28 in.) module with a
heat sink height of 0.5 in.
Heatsink Mounting Advice
A crucial part of the thermal design strategy is
the thermal interface between the baseplate of
the module and the heatsink. Inadequate mea-
sures taken here will quickly negate any other
attempts to control the baseplate temperature.
For example, using a conventional dry insulator
can result in a case-heatsink thermal imped-
ance of >0.5° C/W, while use one of the rec-
ommended interface methods (silicon grease
or
thermal pads available from Astec) can
result in a case-heatsink thermal impedance
around 0.1°C/W.
Natural Convection with Heat Sink
The power derating for a module with the heat
sinks ( shown as figure 23 to figure 26) in nat-
ural convection is shown in figure 33. In this
test, natural convection generates airflow about
0.05 m/s to 0.1 m/s ( 10ft./min to 20ft./min ).
Figure 33 can be used for heat-sink selection in
natural convection environment.
Example 3. How to select a heat sink?
What heat sink would be appropriate for a
AEH30G48 in a natural convection environ-
ment at nominal line, 2/3 load, and maximum
ambient temperature of 40°C?
Determine PD ( referenced Fig.26 ) with con-
dition:
Vin = 48 V
IO = 2/3 (30) = 20 A
TA = 40 °C
Get: PD = 7.5 W
Determine Heat Sink (Fig.33.):
no heat sink allows up to TA = 50 °C
1/4 in. allows up to TA = 60 ° C
Fig.32 Heat Sink Mounting
0
10
203040
90 100
0
20
25
30
35
LOCAL AMBIENT TEMPERATURE, TA (°C)
POWER
DISSIPATION,
P
D
(W)
15
10
5
50
60
70
80
1 1/2 in.
1 in.
1/2 in.
1/4 in.
NONE
Fig.33 Heat Sink Power Derating Curves,
Natural Convection
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相关代理商/技术参数 |
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