[SOLVED] Confused!- Negative gain in feedback loop and still working!!!

[dhaval4987]

Dear all,

I am working on a design of a voltage regulator which involves using a diffpair in a closed loop.

However- at low load current the phase margin sucks and the gain is in negative, but to my surprise, it still works in transient analysis. How can this be possible? whats going on?

Any suggestions?

 

[steadymind]

you need to maintain minimum current on your output feedback to maintain stability. negative gain does not necessary mean your circuit shouldn't work.
pls post a screenshot if possible.