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Determine active to passive transition time (tap) - LM5046

Mammen
Prodigy 110 points
Other Parts Discussed in Thread: LM5046

Hi, 

I'm working on design of Phase Shifted Full Bridge (PSFB) converter using LM5046 PWM controller and I'm facing problem in calculating the active to passive transition time (Tap) Refer the Equation 6 on page 27 as shown link,

I've notice that in order to determine Tap I would require Im ( magnetizing current). However, I do not parameter for the required calculation.

I would appreciate if anyone could advice how to determine this value.

Many Thanks

Mammen