UCD3138 Control Theory

Introduction

This document serves as a comprehensive guide to understanding and implementing digital control theory for the UCD3138 digital controller. It delves into the fundamental algorithms required to model and optimize the frequency response of switch mode power supplies. The content explains how to utilize resulting models and algorithms for calculating compensation coefficients specific to the UCD3138 device.

The UCD3138 is designed for offline and isolated switch mode power conversion applications, supporting both single-loop and multi-loop systems. The document features four application examples illustrating modeling and loop compensation procedures, including PFC circuits and buck converters. Each section provides theoretical background and details the specific algorithms employed by Texas Instruments' Fusion Digital Designer software.

Key Topics Covered

• Fundamentals of Digital Control
• Controller Modeling Techniques
• Analog to Digital Conversions
• z Plane and s Plane Relationships
• PID Controller Implementation and Tuning
• Compensation Strategies
• Application Examples

Resources

For further information and related resources, please refer to the official Texas Instruments website:

UCD3138 Product Page

UCD3138 Fusion Digital Power Peripherals Programmer's Manual