If you cannot find a ready-made Proteus model
After pasting the files, you need to refresh or restart Proteus to update the database. download sg3525 library for proteus
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How to Download and Install the SG3525 Library for Proteus The SG3525 is a highly popular pulse-width modulation (PWM) controller integrated circuit (IC) widely used in power electronics. Engineers and students frequently use it to design switch-mode power supplies (SMPS), DC-to-DC converters, and power inverters. and power inverters.