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UCC28180: Help with transient model simulation

Part Number: UCC28180

Hi, 

Please find PSpice model attached. I am trying to simulate the converter in open loop, with 20kHz frequency to see how the gate signal looks like. I have attached the probed voltage at gate. Please help me understand what may have gone wrong. I have used transient model of UCC28180 obtained from TI.

Regards,

Lakshmi