I have designed a full bridge converter. I am stepping down the voltage from 350V to 60V. I have applied the gate voltage with the phase shift.
But I am getting output voltage only 30V.
By varying my duty cycle % also output is not varying.
Transformer winding is primary 30 turns and secondary 7 turns.
Can you people please let me know where i have done the mistake.

 

There is not enough information to tell where the problem might be. Please post a schematic showing the circuit in question.

 

I have used FAN73912mx gate driver

 

"I have applied the gate voltage with the phase shift." I don't understand this part but it might be important.

I take it that the secondary is made of two windings of 7 turns each. Are you getting 160 V P-P on the anodes of your output rectifiers? What are the DC levels of the negative-going excursions of the waverforms going into the rectifiers? You may be missing a diode.