UCC28710: UCC28710 reference design in TIna-Ti

Tool/software:

Hi, 

   I am trying to do simulation of flyback converter with UCC28710. I got the UCC28710 tina-ti reference design file from texas instruments website. I got the different results from simulation. The DRV signal is not generating pulses to drive the MOSFETs. Please see the results below. Could you please tell me is there any thing i need to reference design to make it work?

I got the following results.

Expected results from Texas instruments website is different from my results. 

Could you please check the reference design file and let me know? Here is the reference design.

e2e.ti.com/.../3364.slum539.tsc