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Switching regulator 78s40 library for simulation

Hi all,

I am designin a DC-DC convertor using 78s40 switching regulator. I am designing it using Altium designer. can anybody provide me 78s40 library function so that i can simulate it before testing on board.

My requirement is a bit urgent so kindly reply to me asap.

 

thanks & regards,

Santosh v Sawal