Which eda software is suitable for siwtchmode power emc simu

Which eda software is suitable for siwtchmode power emc simulate.
I think it have much help for smps designer,I use pspice to do it,but it is very difficult to find some model.

You can Using Nanosim or Hsim .. Becasue my senior work on SMPS , he check the close loop by
these tools

Pls offer some detail about Nanosim and Hsim,and where to find model bout it?

i remember that syn0p$ys have p0wer mill.
check here, http://www.synopsys.com/products/mix...nanosim_ds.pdf