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bq24650输出电压异常,无法充电

Other Parts Discussed in Thread: BQ24650

大家好,我现在遇到一个问题,bq24650的接法如图。设定是输入6V,输出4.2V。但输入电压如果是6V以下,输出为0.78V,输入电压6.2V以上,则输出4.18V,此时如果接上电池,输出又没有了,断开电池测变为0.78V。请问这个问题是什么原因导致的?谢谢