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TPS54560缓慢下降时输出有负脉冲

Other Parts Discussed in Thread: TPS54560

关于使用TPS54560时情况如下:

      输入VIN=24V,设置Vout=12V,在做缓慢下降测试时出现现象:当输入下降到11.2V时,输出电压的会有一个2ms的负脉冲,再继续往下降输出没问题,请问下这种现象是否正常?

把输出改为8.8V时,输入降到8.2V时有问题,再往下降也输出正常。

请问什么情况下会出现这种现象呢