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An LM2596 requires a few external parts to function properly. Add these to your schematic: Place a electrolytic capacitor near the VINcap V sub cap I cap N end-sub pin to filter transient voltage spikes. Output Capacitor ( COUTcap C sub cap O cap U cap T end-sub ): Place a low-ESR capacitor at the output to minimize voltage ripple. Catch Diode ( D1cap D sub 1

These have – transient response, efficiency, switching waveforms.

What appears in the simulation log when it crashes?

Connect a DC Voltage Source to the input pin (Pin 1) set to 12V.

Thermal shutdown and current limit protection. Locating High-Quality Library Files