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在RC5051转换器中增加一个过压消弧电路的设计和分析
消耗积分:2 |
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大小:34 |
2009-06-01
cherry1989
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A typical RC5051 converter for a processor, as shown in Figure 1, has excellent performance in regulating its output voltage to precisely the level required. The converter will almost never fail. However, it is this “almost” that is of
importance here. Once in a very long time, something catastrophic may happen to the converter, causing the output voltage to rise above its regulation level. Examples of such catastrophic events include:
1. The high-side MOSFET, Q1, fails short, perhaps due to
a voltage spike on its drain;
2. A short appears across certain traces, perhaps due to
PCB burrs;
3. The inductor L2 shorts, perhaps due to a wire nick;
4. The high-side drive of the RC5051 fails high, perhaps
due to an over-voltage on the VCCQP pin.
importance here. Once in a very long time, something catastrophic may happen to the converter, causing the output voltage to rise above its regulation level. Examples of such catastrophic events include:
1. The high-side MOSFET, Q1, fails short, perhaps due to
a voltage spike on its drain;
2. A short appears across certain traces, perhaps due to
PCB burrs;
3. The inductor L2 shorts, perhaps due to a wire nick;
4. The high-side drive of the RC5051 fails high, perhaps
due to an over-voltage on the VCCQP pin.
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