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WEBENCH® Tools/UC2843A-Q1: Auxiliary winding in Flyback transformer

Part Number: UC2843A-Q1
Other Parts Discussed in Thread: UC2843

Tool/software: WEBENCH® Design Tools


I am not able to understand the function of auxiliary winding of the flyback transformer connected to the Vcc pin of the switcher. Input DC voltage  is also connected to the Vcc pin via startup resistor network. What is the role of Raux ,Daux and Cvcc and how is the turns ratio of Auxiliary winding achieved? Please explain in detail

Input voltage range is 10 - 26 V DC from a battery

Thanks and Regards