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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： 26/35页
文件大小： 409K
代理商： AEH20G48-8
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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
Example 5. How to determine case tempera-
ture ( Tc ) for the various heat sink configu-
rations at certain air velocity?
What is the allowable Tc for AEH 150W heat
sink configurations at desired air velocity of 2.0
m/s, and it is operating at a 48 V line voltage, a
30 A output current, a 40 °C maximum ambient
temperature?
Determine PD ( Fig.26 ) with condition:
Vin = 48 V
IO = 30 A
TA = 40 ° C
v = 2.0 m/s (400 ft./min.)
Get: PD = 13.5 W
Determine TC: TC = (RCA x PD) + TA
Determine the corresponding thermal resis-
tances ( RCA ) from Figure 35:
No heat sink: RCA = 3.8 ° C/W
TC = (3.8 x 13.5) + 40 = 91 ° C
1/4 in. heat sink: RCA = 2.8 ° C/W
TC = (2.8 x 13.5) + 40 = 78 ° C
1/2 in. heat sink: RCA = 2.0 ° C/W
TC = (2.0 x 13.5) + 40 = 66 ° C
1 in. heat sink: RCA = 1.2 ° C/W
TC = (1.2 x 13.5) + 40 = 56 °C
In this configuration, the heat sink would not
need and the power module does not exceed
the maximum case temperature of 100° C.
AEH Series Mechanical
Considerations
Installation
Although AEH series converters can be mount-
ed in any orientation, free air-flowing must be
taken. Normally power components are always
put at the end of the airflow path or have the
separate airflow paths. This can keep other
system equipment cooler and increase compo-
nent life spans.
Soldering
AEH series converters are compatible with
standard wave soldering techniques. When
wave soldering, the converter pins should be
preheated for 20-30 seconds at 110° C, and
wave soldered at 260°C for less than 10 sec-
onds.
When hand soldering, the iron temperature
should be maintained at 425°C and applied to
the converter pins for less than 5 seconds.
Longer exposure can cause internal damage to
the converter. Cleaning can be performed with
cleaning solvent IPA or with water.
MTBF
The MTBF, calculated in accordance with
Bellcore TR-NWT-000332 is 2,080,000 hours.
Obtaining this MTBF in practice is entirely pos-
sible. If the ambient air temperature is expected
to exceed +25°C, then we also advise a
heatsink on the AEH, oriented for the best pos-
sible cooling in the air stream.
ASTEC can supply replacements for converters
from other manufacturers, or offer custom solu-
tions. Please contact the factory for details.
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