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UCC3813-5: Current Feedback Loop of a DCM DC/DC Flyback Converter

Part Number: UCC3813-5
Other Parts Discussed in Thread: UC2845A
Hello everyone,
I am using a TI controller for a DCM DC/DC Flyback Converter. I haven't chosen yet between the UCC3813-5 and the UC2845A. 
The goal of the DCM DC/DC Flyback Converter is to charge a capacitor to a target voltage around 2000V.
As the output target voltage can vary, I won't use the controller for the voltage feedback but I would like to control the current.
I actually aim at choosing the values of the current feedback loop components (between REF, COMP & FB) : what is the theoretical calculation of the controller transfer function in Discontinuous Conduction Mode ? .
Thank you for your help,
Best Regards,