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....

 

Don't understand your question.

 

The feedback loop is designed to do the opposite to maintain the correct output voltage.

 

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.....

 

Google for "negative feedback in voltage regulator".

 

okay I will do that...........