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电源管理芯片TPS61202纹波的问题

Other Parts Discussed in Thread: TPS61202

最近使用TPS61202设计一个升压电路,输入是2.8V到5VDC,输出是5VDC ,负载电流大概300mA,电感用的4.7μH(VLS2010ET-4R7M),升压前面的电容放的20μF,输出电容是47μF,用的是X7R电容。纹波很大,请高手帮忙分析下怎么解决。输入电容跟输出电容我都改大试过。附图片,

电路原理图如下: