# Linear Regulator in Open Loop AC Operation

In this lab, students will investigate the MOSFET in AC operation which are of interest in linear regulators applications. First, the student will review the equations describing the MOSFET behavior in an AC operation and then use a model to analyze and predict the sensitivity of the output voltage from a gate driver voltage at different frequencies. Students will simulate the response using Multisim Live and take measurements. Students will compare the measured result with simulated and theoretical results. Throughout the lab, students will answer short questions to confirm their understanding of the topic.
##### by Texas Instruments, and Dr. Nicola Femia | University of Salerno

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This is lab 2 of 12 in the course, Power Electronics.

### LEARNING OBJECTIVES

After completing this lab, students will be able to:
1. Given the MOSFET load resistance, DC voltage and a DC gate driver voltage, calculate the magnitude and output voltage AC perturbation determined by AC perturbations injected on source and gate driver voltage, with specified units and decimal digits, by applying the appropriate theoretical formulae.
2. Given the MOSFET load resistance, DC source voltage and a DC gate driver voltage, simulate the operation of MOSFET to analyze the sensitivity of the output voltage with respect to AC perturbations injected by the source and gate driver voltage, with specified units and decimal digits, to determine the accuracy of theoretical predictions.
3. Given a MOSFET, a dynamic power supply, a load resistor and dynamic gate driver, analyze experimentally the output voltage AC perturbation determined by AC perturbations injected on source and gate driver voltage at different frequencies, with specified units and decimal digits, to verify the consistency of theoretical predictions and simulations.

### REQUIRED SKILLS

• Basic proficiency using Multisim Live
• Basic proficiency using ELVIS III Instruments
• Basic proficiency in circuits and analog electronics

### Multisim Live

Multisim Live is an online, touch-optimized component of Multisim, so students can design and simulate their circuits anywhere, anytime, on any device.

### TI Power Electronics Board for NI ELVIS III

Application board for NI ELVIS III which provides a hands-on approach to power electronics using functional blocks and TI circuits to understand each component in a power electronics system.

### NI ELVIS III

Engineering laboratory solution for project-based learning that combines instrumentation and embedded design with a web-driven experience, delivering a greater understanding of engineering fundamentals and system design.