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请教各位问题:TPS55340上电进入pulse skipping模式

是通过测量SW管脚波形得出标题结论的,空载的时候,纹700mV-800mV, 带载的时候,纹波可以达到5V-6V,呈锯齿状,请问各位老师如何处理呢,谢谢