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UCC28950: SLUA560C MOSFET LOSS EQUATION

SAMRAT PUJARI
Intellectual 730 points
Part Number: UCC28950

Hello

In SLUA560C QA loss equation, equation no 37. in FET Selection

Why the total transformer primary RMS current (I_prms ) is used to calculate mosfet loss as welI? I believe transformer primary current is time shared between two pairs of mosfets.

so MOSFET RMS current is lesser than_transformer RMS current. is it not?

what I am missing/

thanks

samrat