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关于BQ24170充电达不到预设充电电流值,求指导!

使用5V/2A的直流适配器,充电电流设置2A,输入电流设置为2A,给4.2V单节锂电池充电。充电过程:预充电阶段能以0.2A充电,恒流充电时充电电流最大只有1.2A,达不到2A的预设值。锂电池也能充满,指示灯状态正常熄灭(在充电时,由适配器给系统供电)。请问充电电流达不到预设值是由于适配器的电流输出达不到吗?还是其他的原因,求教各位指导?