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BQ25895参考设计中PMID升压输出用PMOS+431的保护电路什么作用?

Other Parts Discussed in Thread: TL431

如图,输出用一个PMOS+PNP+431组成的 过压关断 电路的目的是干什么的?不应该是电压降低才关断,防止短路的吗?如果我要做一个短路保护电路,可以将上面逻辑反过来吗?

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