Not Able to Generate 12V 5A output in LTC3703

Hi , 

I am  working on LTC3703 IC. I have found the spice model of the same in LTSpice Simulation tool. I am attaching the simulation file for your reference. I have designed this circuit as per the suggestion in the LTC3703 Datasheet. I am not able to generate the output of 12V / 5A. am i missing out anything in the circuit? Kindly help me to solve this issue. 

Thanks in advance, 

JaganLTC3703_HV_SIMULATION.asc