TINA/Spice/TPS53819A: TPS53819A Start up voltage cannot be changed, it seems the output voltage is been fixed

Tool/software: TINA-TI or Spice Models

Hi， TI' s expert:

I want to simulate 5V volts start up using TINA software, so change the feedback resistors of PR6 from 10K to 1.37K. but after finish the simulation , the result shows the output is not be changed.

you can refer the schematic and the simulation results.

Thanks