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BQ24103A: VCC以及IN,输入电源是5V,不能充电

Part Number: BQ24103A

VCC以及IN的输入电源是5V,给两节串联的锂电池(8.4V)充电,当电池插上的时候,充电状态指示灯不亮。如果没有电池,充电指示灯反而点亮。如果输入电源改成12V,当插上电池的时候,充电指示灯点亮,没有电池的时候不亮,充电功能是正常的。电路图如下:

图中R6以及C8没有焊接。