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bq24133充电问题

Other Parts Discussed in Thread: BQ24133

你好

如下图为项目中用到的bq24133原理图,适配器的电压为12V,过压保护为12.8V,当适配器电压超过12.8V时,VSYS电压不是0V,而是6.7V,当把C48容值从4.7uf改成100pF之后,当适配器电压超过12.8V时,VSYS电压为0V,请问这个C48作用是什么?降低C48容值实现过压保护的原因是什么?谢谢!