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LM5116 LO引脚电压出现负压超规格

Other Parts Discussed in Thread: LM5116

采用LM5116,输入60V,输出24V/4A,电路图同技术手册。

测试LO输出波形如下,在上管开通,SW电压上升时,LO出现负压超规格下限-0.3V,导致芯片LO对地短路坏掉,请问怎么解决,谢谢。

全带宽500M,接地探针测试,带宽20M一样有震荡,应该是真的,随负载加重,震荡幅值越大。

蓝色LO,黄色SW

黄色SW,蓝色HO,红色LO