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TPS55340输出电压噪声比较大的问题

Other Parts Discussed in Thread: TPS55340

参考TI官方手册,设计了TPS55340升压电路,输入4.8V,输出6V,开关频率为470kHz左右。当空载时,噪声达到300mV,带1A的负载时,噪声达700mV,其中空载时,发现尖峰噪声的频率约为470kHz左右,这个频率恰好是开关频率,不知道是怎么回事?