PMP21549: Feedback circuit question

Daniel Mueller

Part Number: PMP21549

Tool/software:

Hello Ti,

just a short question, what is the purpose of these components in the feedback circuit (PMP21549):
(https://www.ti.com/lit/df/tidry12/tidry12.pdf?ts=1743878033516)

Is there any advantage compared to a standard cirucit:

Thanks in advance, best regards,
Daniel

3 months ago

+1 Robert Taylor1 3 months ago

TI__Expert 6670 points

Hi Daniel,

That circuit is a linear regulator that is used to take out the dependance on the output voltage for the loop compensation. It basically gets rid of the inner loop. Please see attached app note that covers this.

It makes the compensation easier and more flexible.

https://www.eetimes.com/power-tips-compensating-isolated-power-supplies/

Thanks,

Robert

0 Daniel Mueller 3 months ago in reply to Robert Taylor1

Intellectual 916 points

Thank you a lot Robert!

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PMP21549: Feedback circuit question