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BQ2057W充电电流问题,随输入电压增大而增大

Other Parts Discussed in Thread: BQ2057W

BQ2057W为8.4v锂电池充电, RSNS为0.5欧姆 输入电压为9V时充电电流为260ma,在输入电压为12V时充电电流为440ma,P_mos使用的是AO3407,电路结构同手册上相同 请问  这是什么问题?谢谢!!