Hi TI engineers,
there is "Many models on www.ti.com continue to be encrypted. If you do need these in unencrypted format, please contact your TI Field Applications Engineer or submit a request through http://www-k.ext.ti.com/sc/technical-support/email-tech-support.asp and they should be able to help you with this request."
So I wrote an Email to the Support but they were not able to help me, unfortunately I also do not have and Contact to a TI Field Application Engineer because I'm a the really beginning of an Startup. the Support told me to ask here in this forum if you are able to deliver me a unencypted model for the UCC28700 to simulate in LTSpice.
Thanks for helping and best Regards
Manuel Diez