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BQ24253充不进电

Other Parts Discussed in Thread: BQ24253

用BQ24253按照以下电路进行充电设计时,发现供电电源5V正常,而充电灯不亮,PGn管脚输出为低,CHGn输出为高,EN1与EN2均已拉低,但始终不能充电!!!跪求大神指导,电路设计有什么问题么???感谢!!!