Linear Regulator in Open Loop DC Operation

This is lab 1 of 12 in the course

by Dr. Nicola Femia | University of Salerno, and Texas Instruments

The goal of this lab is to investigate the properties of a MOSFET in DC operation, when it works as a pass device in linear regulators. First, we review the equations describing the behavior of a MOSFET in DC operation, and discuss the impact of the gate-to-source voltage on the operating point. Next, we predict the MOSFET operating region and calculate the power losses and temperature under different conditions. Then, we simulate the MOSFET using its physical model. Finally, we perform lab experiments to estimate the real value of MOSFET parameters and compare their impact on the accuracy of theoretical and simulation predictions.

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LEARNING OBJECTIVES

After completing this lab, students will be able to:

Given the parameters of a MOSFET, a source voltage and a load resistance, calculate the gate driver voltage required to achieve a desired output voltage. Students will determine the MOSFET operating region and calculate its drain-to-source voltage and current, power losses and junction temperature, with specified units and decimal digits, by applying the appropriate MOSFET equations.
Given the parameters of a MOSFET, a source voltage, and a load resistance, determine the gate driver voltage required to achieve a desired output voltage by simulating the MOSFET operation. Students will determine the MOSFET operating region and calculate its drain-to-source voltage and current, power losses and junction temperature, with specified units and decimal digits, and will determine the accuracy of theoretical predictions.
Given a real MOSFET, a DC power supply, a load resistor of given resistance, and a function generator, set experimentally the MOSFET gate driver voltage, allowing them to achieve a desired output voltage. Students will also record the measurement, with specified units and decimal digits, compare the measured values with the simulations, and determine the accuracy of simulations.

REQUIRED SKILLS

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

Requirements

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. Learn more

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. Learn more

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. Learn more

DETAILED REQUIREMENTS

Required Software

Download Academic Software, Learn About Software Licensing

NI ELVIS III Soft Front Panel Support - Install Instructions
Measurements Live - Access
Multisim Live (Some circuits require premium access) - Access; Learn about Premium
TI Power Electronics Board Configuration Utility Download

Required Hardware

Purchase Engineering Education Products

NI ELVIS III - View User Manual & Specifications
TI Power Electronics Board for NI ELVIS III - View User Manual & Specifications

Resources

INSTRUCTOR RESOURCES

Instructor resources are available. Get access

OTHER RESOURCES

Download Configuration Utility for the TI Power Electronics Board