Download Sg3525 Library For Proteus ((free)) 〈Must Watch〉

The SG3525 is a widely used pulse width modulation (PWM) controller IC, essential for designing high-frequency inverters and DC-to-DC converters

Connect Pin 13 (Vc) and Pin 15 (Vcc) to a +12V DC power source. Connect Pin 12 (Ground) to your schematic ground terminal. download sg3525 library for proteus