MP8017 SSR opto-feedback circuit for different voltages

DC-DC Power Converters
1

Hello,

I am not really sure how to adapt the feedback circuit to different output voltages as it includes some parts, I don’t fully understand right now. I’d be happy if someone could explain the purpose of the components I highlighted with red boxes. And do I need to adapt them if I want to have a different output voltage or is it sufficient to change the components included in the Flyback Design Tool | MPS?

Schematic_MP8017
Schematic_MP80171036×740 52.9 KB

Thanks for your help!

2

TLV431 Controls to 1.25V on its ref pin. So the basic output voltage is controlled by R13 and R14 voltage divider.

Loop compensation is mostly C15 R15

I have only a theory about D6 and C17 , which look to me like some attempt to soft start the converter and establish some current in U2A prior to the loop actually closing,