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Minimum primary inductance LT3999

Hello everyone, 

I am designing a DC-DC converter with the LT3999, input voltage is 24V and output voltages are 5 and 15V.

I am facing some problems. What should be the minimum inductance of the primary side? and what are the parameters of the LT3999 that I need to adjust ?

The Transformer is center-mapped, is the primary inductance the sum of the two inductances ? 

Thank you for responding.

Regards, 

Fares