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BQ40Z80过流保护问题

Other Parts Discussed in Thread: BQ40Z80

用BQ40Z80做了一个7S1P电池样品,在测试过流保护时,设置过流保护为3A以下时,保护动作正常,但设置到保护值为5A时,在保护发生的瞬间放电MOS会击穿,请问这会是什么原因?有遇到过同样问题的吗?放电MOS用的是AO4264E(60V)