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https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1438315/lm25149-q1-does-lm25149-need-an-external-emi-filter-also-with-its-in-built-emi-filter
工具与软件：
LM25149数据表表明、外部差模输入滤波器尺寸可减小50%。 这意味着... 是否需要外部 EMI 滤波器？
大家好、通常情况下、此器件的目标设计会实现一个与器件输入串联的差分 EMI 滤波器、以符合 CE 标准。 该器件的集成式有源 EMI 滤波器可减小设计中可选外部 EMI 滤波器的尺寸。
