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LM3409 FET电路疑问

Other Parts Discussed in Thread: LM3409

技术朋友们好,这是LM3409开发板的文档,里面提到整个FET电路,我想不明C9是起什么作用的。我自己分析是这样:Q2拉低时5V->R4->C9充电,EN脚充电到5V。Q2拉高时,Q2点5V,把EN脚抬升到10V. 但EN脚大于1.7V就可以使能,而且EN脚一直上拉电阻到5V,那这个C9意义在哪里,起什么作用?很想 想明白当中原理,十分感谢。