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TPS54202: 原理图和PCB检查,波形输出自己拿不准,请求帮助

Part Number: TPS54202

您好,我初步设计了一个15V转3.3V的电路,使用了TPS54202,其中电路原理设计和PCB绘制如下,但是当我打板验证后,发现波形相当不对,波形图1是空载时的输出,波形图2是空载时SW引脚的波形,我希望您能帮忙检查一下问题所在,能否进一步减少问题

hjw-3.3v.tifhjw-sw1.tif