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UCC27512: 电源电压为12V时,输出波形抖动

Part Number: UCC27512

原理图如下:

输入0-4V,5MHz方波,波形如下:

当VDD_ADJ=9V,输出悬空时,波形正常:

当VDD_ADJ=12V, 输出悬空时,波形出现抖动:

仔细观察可以发现,此时的脉宽以“大-小-大-小”变化。把输出接入频谱仪,可以看到产生了2.5MHz的1/2次谐波。

请问如何解决这个抖动问题?