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BQ24600: BQ24600输出4.2V/4A 对单节锂电池充电工作不正常

Part Number: BQ24600

如图,不接电池输出为4.2V,接上电池输出电压跟随电池电压,充电电流几乎为0,PG和STAT引脚都为有效;减小输入电压至8V以下充电电流逐渐增大,增大电感值现象一样,请教是什么问题??