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參數(shù)資料
| 型號： | QKS48T21120-PCCS1G |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 252 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT PACKAGE-5 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大小： | 271K |
| 代理商： | QKS48T21120-PCCS1G |
MCD10089 Rev. 1.1, 8-Oct-08
Page 7 of 9
www.power-one.com
QKS48T21120 DC-DC Bus Converter Data Sheet
Quarter-Brick with 48VDC Input; 12VDC @ 21A Output
Thermal Considerations
The QKS48T21120 converter is designed for natural
or forced-convection cooling. The maximum
allowable output current of the converter is
determined by meeting the derating criteria for all
components used in the converter. For example, the
maximum semiconductor junction temperature is not
allowed to exceed 125 °C to ensure reliable long-
term operation of the converter. Contact Power-One
for a complete list of the derating criteria.
The graph in figure 3 shows the maximum output
current of the QKS48T21120 converter at different
ambient temperatures under both natural and forced
convection.
For example, the QKS48T21120 operating at 70 °C
can deliver up to 15.7A reliably with 200 LFM forced
air.
THERMAL DERATING CURVE
QKS48T21120-NCA0
Vin = 48V, Orientation : Vin- to Vin +
0
4
8
12
16
20
24
25
40
55
70
85
Ambient Temperature (Deg C)
L
NC (25 - 35 LFM)
100 LFM
200 LFM
300 LFM
400 LFM
Data Rev: 01
Figure 3. QKS48T21120 Derating Curves
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