Hi Shi,
I believe that this model is only valid for steady state simulations hence you will have to give some initial conditions to the external components to make it work. Please have a look at the inbuilt examples in TINA-TI. You can get to it by clicking on File -> Open Examples ... -> Smps -> UC28600 -> Then open any one of the existing schematics. Start with this schematic as the base and change components to match your application.
Best regards,