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BQ24610异常

Other Parts Discussed in Thread: BQ24610

完全参照BQ24610说明书设计的原理图,在最初制作的双面板时,用24V供电,输出基本为24V,引脚3(ACDRV)输出接的电阻与Q2的G级连接处的电压为18V左右,由于充电发热,后面从新设计四层板,几乎没有更改PCB布局,但是用24V供电,输出缺只有2V左右,引脚3(ACDRV)输出接的电阻与Q2的G级连接处的电压为22V左右,什么情况下会出现这种情况啊?