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BQ2057C充电电流小,请问应该如何修改电路才行?

Other Parts Discussed in Thread: BQ2057C

BQ2057C充电电流小,电流采用电阻采用的0.1欧姆,三极管用的FZT788B,实际充电电流在电压5V情况下只有200mA左右,升到5.4V以上时才能升到400多mA,请问应该如何修改电路才行?