下图中Q3的作用是什么,有点想不明白?
Star Xu:
Q3 will be on when CHG pin is high whether from internal register command or from pull up by PACK- being pulled up by a load when the Q2 discharge FET is off.The body diode of Q3 will raise the source voltage in this case and the FET will turn on with sufficient Vgs.
Hugo Zhang:
Q3的作用主要是在CHG输出为低电平时,在充电管的栅极上看,是一个高阻态
user6114272:
请问这个电路中,如果把Q3和R1取消掉,原有电路的功能是否有影响?
user4988659:
回复 user6114272:
没有这颗MOS管,充电回路是关不断的