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TPS922055DMTREVM: 14脚(SW)输出波形有干扰,如何改善?

Part Number: TPS922055DMTREVM
Other Parts Discussed in Thread: TPS922055

使用TPS922055驱动器LED灯,输入36V,输出电压在20--25V,电流3.5A。

用示波器查看芯片14脚SW,在PWM为10%以下时输出波形干扰大(PWM为15%以上波形好一些)。

36V波形也有大的干扰,如何改善?

原理图如下:

SW波形图如下:(@10%PWM)

36V波形如下: