Connect with us

SMPS with negative feedback?

Discussion in 'General Electronics Discussion' started by eem2am, Apr 27, 2013.

Scroll to continue with content
  1. eem2am


    Aug 3, 2009

    I have implemeneted an external error amp with this 12V, 10A buck converter with an op amp (U3) followed by an NPN (Q1).

    The error amplifier feedback is taken into the "non-inverting input" of the op amp due to the fact that the NPN (Q1) does an inversion.

    Is this OK?......i always thought feedback had to go to the inverting input of the error amp?
    (the error amp is external as this buck will be paralleled with ten other bucks all feeding the same 100A load...just one error amp feeds all controllers)

    Schematic (also provided in pdf)

    LTspice sim also attached

    Attached Files:

Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day