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TPS2491过流保护电路场效应管烧坏

Other Parts Discussed in Thread: TPS2491

我做了一款TPS2491过流保护电路,12.5A保护,我直接把输出短路,本以为芯片会保护,结果场效应管直接烧了;

如果慢慢往上加负载,就没有什么问题,请问是怎么回事。