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TPS65270电压降低



原理图如图所示:

现在有一个问题就是,4.2V这一路输出电流超过100ma,3.3V这一路的电压就会慢慢降低且有波动,导致我3.3V这一路的cpu无法正常工作,但是4.2v很稳。然后4.2v不输出电流时,3.3V输出达到1A,3.3V,4.2V这两路波形都很稳;这是哪里的问题?