Closed-Loop Buck Converter Control – Type-III Compensator (LTspice Simulation + Free Model)

🧭 Designing a stable and fast voltage-mode control loop for a buck converter? In this video, I walk you through a complete closed-loop simulation of a synchronous buck converter using a Type-III compensator — first with an averaged model, and then with the full switching model in LTspice. You’ll see exactly how a 10 kHz crossover and ~68° phase margin translate into real transient performance. 🧑‍🎓 What you’ll learn in this video: ✔ How the averaged buck converter model works in LTspice ✔ How the Type-III compensator shapes loop bandwidth and phase margin ✔ AC loop-gain analysis (crossover frequency + stability evaluation) ✔ Transient performance during load-step disturbances ✔ Differences between averaged and switching-level behavior ✔ The complete VMC control path: feedback → compensator → PWM → MOSFETs ⚡ Simulation setup: • Input voltage: 9 V • Output voltage: 2 V • Switching frequency: 200 kHz • Compensator: Type-III • Models shown: averaged control model + switching model (with PWM, drivers, and dead-time) All LTspice files used in this video are available for free (see link below). 🌐 Download all free models & scripts ✅ LTspice averaged model ✅ LTspice switching model ✅ Type-III compensator sizing script ✅ Loop-gain + Bode analysis scripts (Octave) 👉 Get everything for free: https://hk-academy.com/resources 🎓 Want to go deeper? If you want the full treatment of the Type-III compensator — including intuitive theory, detailed simulations, discretization using Tustin, and a full implementation on the TI C2000 — check out the Type-III Compensator Course on HK-Academy. And for complete voltage-mode buck control (pole/zero placement + HAL implementation + real hardware testing), see the Buck Converter Voltage-Mode Control Course. 👉 Courses page: https://hk-academy.com/courses 📌 This video is ideal for: • Power-electronics engineers developing buck converter control loops • Students learning analog/digital compensator design • Engineers designing voltage-mode control systems for DC/DC converters • Anyone wanting to understand LTspice averaged vs switching simulation 💡 Simulation + measurement + implementation — this workflow is the core of modern power-electronics control design. Subscribe for more LTspice demos, C2000 tutorials, and power-control education from HK-Academy!