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BQ24617 SYSTEM 路径电压会有脉冲波

Other Parts Discussed in Thread: BQ24617

使用BQ24617作为充电管理芯片,

输入电压:10.8-12.6V

电池端:2节18650锂电池并联(7.2-8.4V)

问题:当AC adapter供电给BQ24617,不接电池的时候,SYSTEM路径(原理图中的BAT_VSYS)没法获取稳定的输出电压,会脉冲一段时间后,直接没有输出。当有接电池的时候,SYSTEM路径需要几秒钟才能获得稳定的电压,BATDRV信号有脉冲,请教为什么?怎么样才能获取稳定的SYSTEM电压,不管电池存在不存在?