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BQ24610: 12V适配器接入,电池仍放电,且PG灯灭

Part Number: BQ24610

不按电池(3节18650),接12v适配器后,PG灯正常亮,正常输出12v左右,BATDRV电压12v左右。适配器不接,只按电池,PG不亮,但可以输出12v左右,BATDRV电压6V左右。但是接上适配器,按上电池的瞬间,PG灯灭,测了电压,输出12v左右,BATDRV的电压是6V左右,也就是说BATDRV被拉低,mos管没有关断,电池还在放电。请问我这个是什么原因,谢谢!