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LM5575: Vout not getting properly

Part Number: LM5575

Hello,

I am trying to simulate the LM5575 Pspice model. Feedback resistors calculated for 15V output. But in simulation output, I am finding variation in Vout. and I am not getting exact 15V. It is showing Peak 15.8V min 15.3V.

Please find the attached simulation results and schematic.

My requirements is : Vin : 18V to 36V and Vout : 15V/1.5A