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TPS7A4701-EP: 请问图片标红的电路是怎么工作的?

Part Number: TPS7A4701-EP

Dear all:

         在读TDIA-01371电源使用方案时,有一部分电路没有读懂,请有熟悉的同行在看到帖子时帮忙解答一下,原理图如下图所示:

三级的MOS管是怎么工作的?谢谢了