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BQ24650,太阳能电压小于MPPT,大于电池的时候,功耗8mA

Other Parts Discussed in Thread: BQ24650

BQ24650对12V铅酸电池做充电管理,设置充电电压为13.8V,设置MPPT为17.5V,现在发现,太阳能板电压小于MPPT,大于电池的时候,充电指示灯亮,电池有大概8mA左右的输出,是怎么回事?