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CSD18535KTT 波形问题

上图是  黄色:为门级驱动  绿色:M- 电压。红色电流

可以看到在mos管关闭的过程中,M- 过压很高。于是试图增大关断时间。但是出现如下图所示波形.

请问大家,在增大关断时间以后,M- 为什么有一个高频抖动平台。怎么解决。谢谢。