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UCC28950: ucc28951

Part Number: UCC28950


I am going to design a 3kW Phase Shifted Full bridge Synchronous Rectifier (PSFSR) charger. The DC/DC converter details are given below.
The DC/DC designing details:
 Power rating: 1.2kW.
Input voltages Vin =380 - 420V,
Nominal input Vin_nom = 400V,
Output voltages Vo =36 - 60V,
Nominal Output Vo_nom = 48V,
Switching frequency = 100kHz. 
Inductor (LOUT) Switching Frequency = 200kHz. 
Based on the design calculations from excel sheet, all the parameters are updated and simulated by using UCC28950 PSPICE_TI simulation tool. The output voltage is not regulating. The simulation results along with simulation file and design Excel sheet are attached here. 
Please do needful.