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TPS63020: 电源输出会出现跌落的情况

Part Number: TPS63020

 采用锂电池供电,电池输出分成2路,两路都是DCDC ,蓝色的是3.9V,黄色的是3.3V输出,工作时会出现图中的电压塌陷或升高的情况,请大神帮忙看下什么原因?