TIDM-RESLLC-DCDC

Resonant LLC Half-Bridge DC/DC Converter

TIDM-RESLLC-DCDC

Design files

Overview

This design is a digitally controlled 300W resonant LLC half-bridge DC/DC converter with added synchronous rectification. The resonant LLC power topology is valued for its inherently high levels of efficiency credited to high frequency, low loss resonant switching. However, implementation of such a power converter can be challenging since the control theory is based in frequency modulation of the converter rather than the more typically seen duty cycle modulation. This design guides users step-by-step through the complexities of a resonant LLC half-bridge converter, melding software and hardware design approaches to implement a complete high performance converter. The C2000™ Piccolo™ microcontroller is the digital controller for this design, enabling the resonant converter to operate at greater than 90% efficiency across wide load ranges, and with peak efficiency greater than 93%.

Features
  • Full microcontroller-based control of resonant LLC half-bridge DC/DC converter
  • 375-405V DC input, 12 DC output, 25A rated output (300W)
  • >90% efficiency across wide load range with >93% peak efficiency
  • Synchronous rectification support for increased power efficiency
  • Zero voltage switching (ZVS) across entire load range for greater efficiency and reliability
  • Convenient GUI for initial design evaluation, and detailed step-by-step documentation for further depth of evaluation

NOTE: Software for this board can be found inside the controlSUITE™ software package. Download controlSUITE at ti.com/controlsuite. Once installed, navigate to "High Voltage LLC Resonant Developer's Kit" under the Development Tools -> Digital Power section.

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU257.PDF (1515 KB)

Reference design overview and verified performance test data

TIDU256.PDF (1374 KB)

Reference design overview and verified performance test data

TIDR458.ZIP (107 KB)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDR459.PDF (2313 KB)

PCB layer plot file used for generating PCB design layout

TIDC318.ZIP (442 KB)

Detailed schematic diagram for design layout and components

TIDR457.PDF (94 KB)

Detailed schematic diagram for design layout and components

Products

Includes TI products in the design and potential alternatives.

Linear & low-dropout (LDO) regulators

TPS795500-mA, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
C2000 real-time microcontrollers

TMS320F28027-Q1Automotive C2000™ 32-bit MCU with 60 MHz, 64 KB flash

Data sheet: PDF
C2000 real-time microcontrollers

TMS320F28027C2000™ 32-bit MCU with 60 MHz, 64 KB flash

Data sheet: PDF

Technical documentation

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Type Title Date
* Design guide Resonant LLC Half-Bridge DC/DC Converter Software Design Guide Mar 14, 2014
* Design guide Resonant LLC Half-Bridge DC/DC Converter Hardware Design Guide Mar 14, 2014
More literature Resonant LLC Half-Bridge DC/DC Converter Quick Start Guide Mar 14, 2014
More literature Designing an LLC Resonant Half-Bridge Power Converter Jul 26, 2011

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