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BQ25505的输入问题

Other Parts Discussed in Thread: BQ25505

BQ25505上电一段时间内,VIN是正常的输入电压3.3V,VBAT_SEC上的电容正常充电。可是电容充到2V多的时候,输入突然降到0V,并且电容不再充电,这是怎么回事?测试输入的前级还是正常的。

VBAT_OK = 2.4V

VBAT_OK_HYST = 2.66V

VBAT_OV = 4.8V

MPPT = 68%