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| 型号： | AN-53 |
| 厂商： | Fairchild Semiconductor Corporation |
| 元件分类： | DC/DC变换器 |
| 英文描述： | Implementing an RC5051 DC-DC Converter on Pentium II Motherboards |
| 中文描述： | 推行RC5051的DC - DC转换器的奔腾II主板 |
| 文件页数： | 17/20页 |
| 文件大小： | 143K |
| 代理商： | AN-53 |
APPLICATION NOTE
AN53
17
The DC output voltage is measured from minimum to maxi-
mum load current. Ideally, the RC5051 should show about
20mV droop between these two limits. Note that the mea-
surement must be taken directly on the leads of the output
capacitors, since there may otherwise be parasitic resistances
causing additional droop.
Output voltage load transients due to load
current step
Figure 15. Low to High Current Transiet Response
Figure 16. High to Low Current Transiet Response
The output voltage transient response to the worst-case step
current load is measured using an Intel EMT tool. Again, the
measurement must be taken directly on the leads of the out-
put capacitors, since there may otherwise be parasitic resis-
tances and inductances causing additional droop.
Over-Current Limit
Using an electronic load, the output current should be slowly
increased until the converter hits over-current limit. Reach-
ing this limit will be evident because the output voltage
quickly drops out of regulation as the current is increased.
Component Case Temperature
Each of the major components should be measured for
excessive temperature, which can be indicative of a problem.
At the least, the RC5051, the MOSFETs and the schottky
diode should all be measured. The converter should be run at
its maximum load current until it reaches thermal stability, at
least 20 minutes, before the temperature measurements are
taken.
Test
Condition
0.5A-14.5A 96mV
Measured
Comment
Limit =
130mV
PASS
Figure 15
Limit =
130mV
PASS
Figure 16
Low to high
Current Step
(Vout =
2.00V)
High to Low
Current Step
(Vout =
2.00V)
14.5A-0.5A 109mV
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