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參數(shù)資料
| 型號： | AEH10G24-N8 |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 25 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 28/38頁 |
| 文件大?。?/td> | 517K |
| 代理商： | AEH10G24-N8 |
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-34-
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 4. How to determine the allowable
minimum airflow to heat sink combinations
necessary for a module under a desired Tc
and a certain condition?
Although the maximum case temperature for
the AEH Series converters is 100° C, you can
improve module reliability by limiting Tc,max to
a lower value. How to decide? For example,
what is the allowable minimum airflow for AEH
100W heat sink combinations at desired Tc of
80 °C?
The working condition is as following:
Vin = 24 V, IO = 20 A, TA = 40 °C
Determine PD ( Fig.30. )
PD = 15 W
Then solve RCA
::
RCA =
TC, max / PD
RCA =
(TC TA)
/ PD
RCA =
(80 40)
/ 15 = 2.7°C/W
determine air velocity from figure 39:
If no heat sink:
v = 3 m/s (600 ft./min.)
If 1/4 in. heat sink:
v = 2 m/s (400 ft./min.)
If 1/2 in. heat sink:
v = 1.4 m/s (280 ft./min.)
If 1 in. heat sink:
v = 0.5 m/s (100 ft./min.)
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 24Vin 100W
heat sink configurations at desired air velocity
of 2.0 m/s, and it is operating at a 24 V line volt-
age, a 20 A output current, a 40 °C maximum
ambient temperature?
Determine PD ( Fig.30 ) with condition:
Vin = 24 V
IO = 20 A
TA = 40 ° C
v = 2.0 m/s (400 ft./min.)
Get: PD = 15 W
Determine TC: TC = (RCA x PD) + TA
Determine the corresponding thermal resis-
tances ( RCA ) from Figure 39 :
No heat sink: RCA = 3.8 ° C/W
TC = (3.8 x 15) + 40 = 97 ° C
1/4 in. heat sink: RCA = 2.8 ° C/W
TC = (2.8 x 15) + 40 = 82 ° C
1/2 in. heat sink: RCA = 2.0 ° C/W
TC = (2.0 x 15) + 40 = 70 ° C
1 in. heat sink: RCA = 1.2 ° C/W
TC = (1.2 x 15) + 40 = 58 °C
In this configuration, the heat sink would not
need and the power module does not exceed
the maximum case temperature of 100° C.
Mechanical
Considerations
Installation
Although AEH 24Vin series converters can be
mounted 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
0
0.5
(100)
1.0
(200)
1.5
(300)
2.0
(400)
2.5
(500)
3.0
(600)
0
1
5
6
7
8
Air Velocity m/s (ft./min.)
4
3
2
Case-Ambient
Thermal
Resistance
R
CA
(°C/W)
1 in. HEAT SINK
1/2 in. HEAT SINK
1/4 in. HEAT SINK
NO HEAT SINK
Fig.39 Case-to-Ambient Thermal
Resistance Curves; Either Orientation
相關(guān)PDF資料 |
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| AEH10G24-N | 1-OUTPUT 25 W DC-DC REG PWR SUPPLY MODULE |
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| BANFA-BS1 | INTERCONNECTION DEVICE |
| AEV110122 | POWER/SIGNAL RELAY, SPST, MOMENTARY, 0.013A (COIL), 12VDC (COIL), 1400mW (COIL), 10A (CONTACT), 400VDC (CONTACT), PANEL MOUNT |
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