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关于bq29707的问题,请求有人来解答一下

Other Parts Discussed in Thread: BQ24266

这是我设计的原理图

BQ24266那边接5V电压同时BQ29707接3.7V电压后整个电路是可以通的(直流电压)但是断了5V电压后几秒钟FET那边就不通了,请问是什么原因呢?谢谢!