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LM5019波型問題(已更新重發)

大家好:

LM5019第8pin,SW量到的波型怪怪的
能幫忙看一下那裏出問題嗎?
電感220uH,頻率320K左右
量測波形時無負載
輸出12V
(已新增原理圖和layout) 

Thanks