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TPS62913: 电源纹波较大

Part Number: TPS62913

上图是我设计的TPS62913原理图

下图为PCB图

测得的纹波如下,使用泰克示波器,普通的探头,带宽限制20MHz

请问纹波为什么会这么大呢?有什么办法能改善一些呢?原理设计基本参考官方设计