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TPS54360: TPS54360DDAR纹波过大

Part Number: TPS54360

使用TPS54360ddar这块电源芯片用于48V转12V输出时候,用示波器测量该芯片的输出电容两端,发现有+-700mV的纹波,问下为什么会有这么大的纹波呢?并且如何减小纹波呢?