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TPS92641: 下边mos管上升沿与下降沿负脉冲问题

Part Number: TPS92641

用tps92641芯片做LED驱动,没有满载时测试下边mos管Vds电压波形,上升沿与下降沿都有几个频率很高(60-70MHz)的负脉冲,请问这个负脉冲的来源是哪里?有没有什么措施能改善这个负脉冲?上升沿时候的负脉冲最小值-12V,下降沿时候的负脉冲最小值-6V