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TI开关稳压电源芯片LM5021-2问题咨询

Other Parts Discussed in Thread: LM5021

Switch Power :  85~265VAC input ,  12V 5A 60W output , f = 132kHz .

TTI开关稳压电源芯片LM5021-2的驱动输出引脚的输出波形不正常,上升沿和下降沿太长,导致无法驱动后续开关管,在断开后续电路的情况下,上升沿和下降沿的时间在1us左右,而资料上是10ns级别,请问这可能是什么原因导致的?急。。

C2是驱动引脚输出波形。

芯片电路和相关驱动电路如下: 

谢谢!