Power Supply Compensator Design Using Operational Transconductance Amplifiers

by Dr. Ali Shirsavar - Biricha Digital
The design of compensators with standard voltage error amplifiers, i.e., a typical operational amplifier (op-amp), is well documented in many books, application notes, design examples, and even automated software. What received less attention is compensator design using operational transconductance amplifiers (OTAs). Unfortunately, our PWM controller IC often contains only an internal transconductance op-amp, leaving us no choice. In this session, Dr. Ali Shirsavar from Biricha Digital will demystify how this particular op-amp operates and explain in simple terms how we design PSU compensators for stable operation down to the component level. As always, simulations and experimental results will be presented.