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BQ24133充电问题,麻烦大家看下

Other Parts Discussed in Thread: BQ24133

用BQ24133做的2S锂电池充电板,未接电池的时候测试输出端为8.4V,STAT灯慢闪,插上电池之后STAT灯还是慢闪,

按照芯片手册上说的,正常充电的时候STAT灯应该一直常亮;

用示波器查看空载时输出端波形如下:

pin (SW)输出波形很乱,波形如下:

pin(BTST)端波形如下:

有没有调试过这个电路的朋友看下,为什么输出波形这么乱?而且不能正常充电