UCC28251PWR

On UCC28251PWR datasheet is info how to set tine delay betwen input and output pulses (SP and PS pins).

datasheet: "Dead time between primary-side switch
and secondary-side synchronous rectifiers can be
independently programmed"

I did not find information about dead time betwen primary side pulses in case of 50% duty cycle.

In assembled converter i can see 110 ns dead time. It suits for my converter, but would be good to understand how to calculate primary side impuls dead time.

Thank you

Serg