I'll copy this here since it's more of a switcherpro issue than smps design issue.
I made a 4.3V -> 3.3v smps design with TPS54332 for 0.5A load and 4.7uH ind, 22uF ceramic cap.
Switcherpro (correctly) shows the fsw/2 peak with inadequate slope compensation as shown in Ridley's and Sheenan's papers on CMC modeling. However the Q of the peak seems to be calculated differently from the published papers. With 4.7uH the peak is severe. Going to 10uH inductor the peak practically disappears which seems a bit unlikely relationship to the double pole Q. I played a bit with the what if scenarios and there peak seems to go from very large at 6uH to neglible at 9uH.
In Sheehan's Current-mode modeling paper the inductor inductor size is just a denominator in the Q equation the wouldn't peak jump like that with halving the inductor size.
Is the switcherpro model correct wrt network analyzer?
