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BQ24650RVAR设计为3串锂聚合物电池充电工作异常请教?

我用BQ24650RVAR设计了充电电路,输出设置为12.6V,没有接上待充电池时输出为12.6V,接上电池后输出为12V。设计为12.6V输出应该是3串充电器,但是规格书里面标明的是2串,如果规格书里对的,那么3串充电器应该设置为多少呢?

还有看到这款芯片是太阳能充电源,我现在充电源用的是稳压20V 2A的电源,是否有影响?