pwm controller for buck boost
powersys,
I think what you need is feedforward control. The feedback control you built can stay but I think you may need to adjust the amplitude of the sawtooth waveform to make the adjustment you like. The feedforward control should not change the dynamics of the system so the loop gain stability that you have with your design will be retained.
I recently posted about this topic but I cannot search the board now since the search has been disabled due to server load. When you get a chance do a search on "feedforward" and you should be able to find it.
dcj50105 -- enjoy the papers!
Best regards,
v_c