STMicroelectronics AN2450 LLC Resonant Half-Bridge Converter Design Guideline

This document provides design guidelines for LLC resonant half-bridge converters, including their high efficiency, low EMI emissions, and high power density.


STMicroelectronics AN2450 LLC Resonant Half-Bridge Converter Design Guideline - cover page
Brand
STMicroelectronics
Category
Other Electronics
Document type
Application Note
Language
English
Pages
32
File format
PDF
File size
583 KB
Published
06 August, 2012
Updated
29 September, 2023
MD5 checksum
67DD8EC5268BC49BE0CED0D56EF97F15

About this manual

This document serves as a design guideline for LLC resonant half-bridge converters, addressing the lack of information regarding their operation and design optimization. It utilizes the first harmonic approximation (FHA) technique to provide a quantitative analysis of steady-state operation, enabling engineers to derive a practical design procedure.

What's inside

  • FHA circuit model
  • Voltage gain and input impedance
  • ZVS constraints
  • Operation under overload and short-circuit condition
  • Magnetic integration
  • Design procedure
  • Design example
  • Electrical test results

Frequently asked questions

What is the primary purpose of this application note?

The document provides a detailed quantitative analysis of the steady-state operation of the LLC resonant half-bridge converter to help designers optimize its features.

What design methodology is used in this note?

The application uses the first harmonic approximation (FHA) technique, which analyzes resonant converters using classical complex ac-circuit analysis.

What is a key benefit of this converter topology regarding output voltage regulation?

The design allows the converter to regulate the output voltage down to zero load, which is a main benefit compared to traditional series resonant converters.

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