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TPS54061电源纹波测量问题?

Other Parts Discussed in Thread: TPS54061

我在一份文档中看到对TPS54061的电源纹波测量,和我自己测到了不一样,是我的测量方式不对吗?还是示波器设置的不对?

   8.1 功能测试

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自己测量的波形图,示波器设置------交流耦合,带宽限制20M,短地线

测量的是C21两端的电压纹波