Quick Notes:
The bode plot is only meaningful to fs/2 in switching converters (sampled systems)Using 1000 points sounds excessive to me. Might only be feasible in the impulse response analysis.Try starting with a smaller model.The “Buck Converter with Analysis Tools” demo model is a good starting point. See attached model, where I modified the demo model.
BuckOpenLoop_KYF.plecs (18.8 KB)