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TPS54821辐射EMI超标.docx只在TOP层有12VDC—DCDC—DC_5V走线，在底下的其它层基本是GND。TPS54821电路布局位置在板的右下角
辐射超标在220Mhz 附近有一个鼓包
频普分析仪实测的频率和暗室测出来的频率相近，频普分析仪扫到的位置正好是TPS54821有此辐射鼓起
PCB走线此芯片只在TOP层，其它层基本是GND
