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55340芯片的输出电压纹波很大,为什么??

Other Parts Discussed in Thread: TPS55340

你好,我使用的TPS55340芯片设计的升压电路,12V升24V,输出电容为22uF,ESR为5mΩ,输入电容为68uF,输出电流为0.8A,工作频率为500kHz,,电感大小为4.7uH,按理说我的输出电压纹波为31mV,就算有误差也不是很大,但是在测试的时候输出电压纹波高达480mV,输出电压纹波频率与SW频率同步,COMP也同步,PCB板我是按照典型应用给的,我想问下还有其他什么原因影响电压纹波啊?加大输出电容时纹波会下降。