Buck PWM

Discussion in 'General Electronics Chat' started by Zsonali, Apr 14, 2014.

  1. Zsonali

    Thread Starter New Member

    Apr 3, 2014
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    Hi All,
    I have one doubt regarding buck dc dc operation.....
    Why the operation of the feedback loop is just the opposite of the operation when the feedback is connected?
    Means while we disconnect the loop and see the output....
     
  2. crutschow

    Expert

    Mar 14, 2008
    12,986
    3,226
    Don't understand your question. :confused:
     
  3. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,969
    744
    The feedback loop is designed to do the opposite to maintain the correct output voltage.
     
  4. Zsonali

    Thread Starter New Member

    Apr 3, 2014
    18
    0
    I wanted to test Power Good pin operation for a buck converter....
    there I used a voltage generator across the feedback during the steady state of the by disconnecting the loop, but for an overvoltage test at the output we need to have the control of the feedback on the output,......... this is the condition where i am not understanding the loop opreration properly.....
     
  5. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    Google for "negative feedback in voltage regulator". :)
     
  6. Zsonali

    Thread Starter New Member

    Apr 3, 2014
    18
    0
    okay I will do that...........
     
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