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BQ24610: 接适配器不正常

Part Number: BQ24610

 您好,为什么单独接入适配器不接电池的时候电源PG灯不亮?Vref=0V,Regn=0V。接入电池就正常了,PG灯也亮了,也可以充电。

我把Q9拆掉就单独连接适配器的时候就正常了,PG也亮了,为什么呢?