Help：closed loop compensation of buck circuit

[Garlin]

I designed a buck circuit with L=50uH,C=500uF,R=1ohm~10ohm,and resistance of is neglected.
Finally the phase margin is nearly 1.3 degree.I referred some literature and attempted to adopt PID
to compensate the phase and adjust the static amplitude margin.But I don't know how to adjust the parameters
of PID compensation circuit. Any one who has an experience of this can give me a help?
Thanks!

 

[tgootee]

Ideally, the phase margin would be 78 degrees.

 

[goldsmith]

I designed a buck circuit with L=50uH,C=500uF,R=1ohm~10ohm,and resistance of is neglected.
Finally the phase margin is nearly 1.3 degree.I referred some literature and attempted to adopt PID
to compensate the phase and adjust the static amplitude margin.But I don't know how to adjust the parameters
of PID compensation circuit. Any one who has an experience of this can give me a help?
Thanks!

Hi Garlin
Either Brown's book or Pressman's book are dealing with loop compensation design tips . refer to those books ( switchmode powersupply cook book by Marty Brown and Switchign power supply design by Abraham I pressman )

Best Wishes
Goldsmith