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TPS61088升压接负载后出现杂波

Other Parts Discussed in Thread: TPS61088

TI工程师:

用TPS61088做3.7V锂电池升压方案,3.7--4.2升压成5V,不加负载时输出比较稳定,如图1(蓝色是升压的波形5V,红色为sw开关波形)

图1

加入负载之后(约2A 负载越大抖动越大),升压后的5V出现较大干扰,如图2(蓝色是升压的波形5V,红色为sw开关波形)

图2

原理图参考webench,PCB参考EVM设计,如下

这是什么原因导致的呢?求解