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BQ24171的VREF电压是3.9V,不充电

Other Parts Discussed in Thread: BQ24171

用BQ24171设计了一个3串锂电池充电电路,结果发现不充电,但是电源路径管理是正常的,也就是接了DC的话,就是DC供电,如果断掉DC则电池输出供电,但是接上DC的时候电池并不充电,我查了一下发现VREF电压是3.9V,不是3.3V,不知道什么问题呢?各位帮忙下!