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BQ24650充电电路不充电问题

我的原理图见附件,测量的各个参数值为Vmppset=1.76V,Vts=2.9V,Vref=3.3V,VCC=23.52V,Vregn=6.25V,BTST处的波形如图所示,Vsrn=Vsrp=4.2V