Lm2596 Proteus Library _best_ -

Close and reopen the software for the new components to appear in the "Pick Devices" (keyword: 3. Simulation Challenges LM2576 DESIGN AND PCB LAYOUT IN PROTEUS

For the ADJ (adjustable) version, use a potentiometer or two resistors to set the output voltage. Common Troubleshooting Tips lm2596 proteus library