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RE:TPS5450 EMC问题

我们在过CE认证测试时,TPS5450辐射超标。现在将TPS5450 DC-DC电源板独立带上2A纯电阻测试,在188.4125MHz 超出17.59dB,222.1698MHz

超出12.5dB.附档图示,有什么方法能降低辐射,请建议。