Operational Transconductance Amplifiers In PWM ICs: Grounded And Negative Feedback Compensation Both Have Their Place

Focus:

Operational transconductance amplifiers (OTAs) are commonly used with grounded-feedback compensation networks in PWM IC designs. However, an alternative configuration—connecting the compensation network via negative feedback to the output voltage divider—has shown promising results. Despite its potential, this approach remains underutilized, likely due to misconceptions about its viability. This article aims to clarify that misunderstanding and explore the merits of both configurations. Using type-II feedback transfer function models, which are presented here, the article compares grounded and negative-feedback implementations in a boost converter design example to highlight their respective tradeoffs and performance characteristics. All theoretical expressions are validated through SIMPLIS simulations to ensure practical relevance.

What you’ll learn:

• How to understand the benefits of using negative-feedback compensation for OTAs in power converter designs
• How to understand the tradeoffs of grounded versus negative-feedback compensation for OTAs in power converter designs

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Author & Publication:

Alain Laprade, Power Electronics Specialist, Saunderstown, R.I., How2Power Today, Aug 15 2025

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