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BQ24610: 充电实际电流值和设计值差的比较大

Part Number: BQ24610

BQ24610调试过程当中,VERF 3.3V空载时正常,一充电就会降至3.23V,导致充电电流比设计值偏小1A左右,输入电压是19VA,充4串铁锂电池,电池端充电电流设计值是4A,现变成2.7A,不知道是什么原因造成的?如何才能解决?