The link to the .stp model on the TLC5940 page for the HTSSOP28 package device appears to be broken:
http://webench.ti.com/cad/dlbxl.cgi/step/mxa28a.stp
Not Found
The requested object does not exist on this server. The link you followed is either outdated, inaccurate, or the server has been instructed not to let you have it.
Could I please have a model and could the link please be fixed.