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TPS65235内部电源输出端的两个MOS管的作用是什么?

Other Parts Discussed in Thread: TPS65235

如图所示,下面第一张图是基本的Boost电路的电路图。对应到TI的TPS65235芯片就是LX管脚所连接的电感、肖特基二极管、内部MOS管。问题来了,第二图右边的芯片内部框图中的两个MOS管Q1、Q2的作用是什么?是一种反馈电路吗?在网上搜索到一种gain Boost电路和这个结构很像,这个是gain Boost吗?