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单电源缓冲器电路反馈问题

Hi 

最近看到一篇TI关于稳定性的文章,是TIM Green写的《单电源缓冲器电路的实际设计》,但是不理解里面介绍下图中直流Beta是等于4.1/0.0342 ?  为什么不是4.1/4.2658?不是应该是Vfb/Vout嘛?