TPS57040-Q1: Open Loop transfer function

I would recommend you use the on line Webench tool to check your compensation.

Yes I am using the Webench designer tool , but I need the formula of the OL transfer function in order to do my stability analysis .

Do you need something other than what is included in the datasheet? I know that it is ideal current mode without slope compensation included. Usually for wide Vin, the duty cycle is low and slope compensation can be ignored.

I checked with the systems engineer. Anything other than what is in the datasheet would be difficult to provide. I am not sure why you cannot use Webench to do the analysis.