LM5116: High duty cycle application issue

Hi there,

Firstly, thanks for your time of checking my inquiry.

I met a difficulty when estimating LM5116 at a high voltage output application： 58Vin and 52V/8A output.

When i simulated this design on WEBENCH, it failed to create the suggestion solution.

I worry it is limited by the max duty on?(cause minimum off time of LM5116).

But when i tried to decrease the frequency to a level about 200kHz, it worked in PSPICE for TI.

So my question is what is the real status of this chip, could it work in high duty rate by lower the freq?

Or is there any limitation not listed in Datasheet, and lead to no supporting on high duty application?

Much thanks if any comments on this.

Dong