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RE:TPS5450 EMC测试时辐射很高

TPS5450电路如附图。现在过EMC时,有个频率146.4MHz辐射很超8dB(class b)。

现在在续流二极管处加30欧/100MHz瓷珠L7505,辐射能降到正常值。现在带上5V 1A的负载,电压会升高,带负载能力不能超过5V 500mA.

请帮忙分析一下原因或有其它办法抑制辐射,不用加磁珠办法。