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BQ24170充电问题请教

Other Parts Discussed in Thread: BQ24170

BQ24170空载时输出电压为8.4V,STAT灯慢闪,插上电池后,STAT灯也是慢闪,无充电电流

测得空载时SW脚输出波形如下图所示:

测得DEMO板上SW脚输出波形如下图:

请教:为什么我的板子SW脚输出波形这么乱?是不是输出振荡了?