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LM5146-Q1: start-up simulation in WEBENCH

Part Number: LM5146-Q1

I selected components using the design calculator tool and plugged them into the WEBENCH schematic. I then ran a start-up simulation, expecting the output to ramp to 12V, but the output collapsed after ramping upto ~7V. Could you give some suggestions on what might be the cause and how I can fix it?

Thanks.