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TPS61088芯片噪声问题请教

Other Parts Discussed in Thread: TPS61088

电路设计为单节18650锂电池+TPS61088升压芯片+恒流源芯片+尾部按键功能芯片+LED,有两个档位,高、低,设定高档恒流输出1.5A,低档电流为高档的25%,切换为低档后发现61088升压芯片产生噪声,高档时升压芯片正常,这是为何?是频率问题吗?

61088设定输出5.5V,电流3A,用的电感是1UH 9A的贴片电感。

尾部按键功能芯片:全亮、25% 亮