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BQ25892 充电问题

Other Parts Discussed in Thread: BQ25892

Dear,

我请教一个问题,用9v充电器充电时,想知道SW脚为什么是9v?充电开始时是下管导通,SW是0v,下管关闭后,SW应该是VPH电压,如何达到9v,?谢谢