PSU output circuit - whats the function?

• PSU output circuit - whats the function?
  Posted by JJalling on 26 Feb, 2017 11:00
• Hello all,
  
  I'm looking at the schematics of a smps design from TI (https://www.ti.com/seclit/df/tidrlm1a/tidrlm1a.pdf), but I cant figure out what the functionality of the highlighted section (see attachment) of the PSU is (page 2 of the schematics).
  
  Can someone please give a quick explanation?
  
  Thanks, BR Jonas

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