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LM22676 EMC 辐射超标问题

Other Parts Discussed in Thread: LM22676

最近项目上使用LM22676来实现12V转5V,在EMC测试时(只焊接了下图中的DC-DC电路,带4.7Ω水泥电阻负载)发现在144MHz附近辐射超标。PCB部分基本按照参考设计及Layout Guide的。请给予一些EMC改善的建议,谢谢