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UCC28730: Duty Cycle and t_on at frequencies below Fmax

Part Number: UCC28730

Tool/software:

How can I calculate duty cycle and ton for a given frequency of operation of this device?

For example, at 28kHz the peak primary current will be Ippmax/3 according to the control-law profile. What would be the corresponding duty cycle/ton at 28kHz? 

Thank you.