Newbie needs a comparison of various cores in terms of size/characteristics etc.

Hi There,

I have only just started using the PI Expert suite and as I'm also new to SMPS & transformer design I'm not familiar with the various cores/bobbins etc. I was wondering if there's an online resource that anyone can point me to that describes the standard parts?

I'm trying to design a power supply with the PeakSwitch part but the transformer keeps coming back with an error "Transient KP is too low." I have tried to select many different cores but none seem to make any difference, but I am also making changes without understanding the impact or reason for making these changes.

any pointers would be greatly appreciated.

Regards

P