The is a third-party add-on that allows engineers to simulate the popular LM2596 buck converter within the Labcenter Proteus environment. Because the LM2596 is a switching regulator—part of the "Simple Switcher" family—it requires specific SPICE models to accurately reflect its 150 kHz frequency and 3A current handling in a simulation. Key Features of the LM2596 Library
This approach gives you control over simulation depth.
Click on and search for LM2596 . You should now see the components listed.