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TINA simulation of UCC28880 high side buck ckt

Other Parts Discussed in Thread: UCC28880, TINA-TI
I have been unsuccessful in getting a TINA simulation of the UCC28880 to run in high side buck mode.  My design is based on a WEBench design I did. The circuit design appears to function fine in webench however the webench tool is limited in simulation capabilities with this switcher.
I modified the TI supplied TINA Low side buck simulation, which appears to run fine before I modified the schematic.
Any suggestions would be appreciated.
This is similar to the TI demo board PMP8550.