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LM5143: SW波形下降沿抖动

Part Number: LM5143

 在使用LM5143时,48V输入30V输出,空载时SW波形下降沿出现200ns的抖动,频率在±20%的范围内变化(DITH接的VDDA),这个是哪些原因造成的呢?对使用是否有影响