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LM5021-1的PWM波形有规律地间断输出

请问,LM5021-1做电源设计,220V交流输入15w左右,没有加高压,控制电路调试时,发现COMP波形是锯齿波,SS波形也是锯齿波,驱动波形有规律地断续出现,和手册上的过载保护有点像,输出反馈电路也接上了,comp电压在0-4V之间波动,不知道怎么解决

下图的锯齿波和上图的手册上波形区别较大

示波器抓到的波形,和根据Css电容计算的间断时间Toff时间接近