Resonant LLC Half-Bridge DC/DC Converter
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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%.

  • 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 Once installed, navigate to "High Voltage LLC Resonant Developer's Kit" under the Development Tools -> Digital Power section.

See the Important Notice and Disclaimer covering reference designs and other TI resources.


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HV Resonant LLC Developer’s Kit


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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
TMS320F28027  Piccolo™ 32-bit MCU with 60 MHz, 64 KB Flash  Microcontrollers (MCU)  Sample & Buy View Design Kits & Evaluation Modules
TPS795  Ultralow-Noise, High-PSRR, Fast, RF, 500-mA Low-Dropout Linear Regulators  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
TMS320F28027 Download -
Download Download
TPS795 Download

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Technical Documents

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User guides (2)
Title Type Size (KB) Date
PDF 1514 14 Mar 2014
PDF 1373 14 Mar 2014
Design files (3)
Title Type Size (KB) Date
Multiple Files   31 Mar 2014
ZIP 106 31 Mar 2014
PDF 93 31 Mar 2014
More literature (2)
Title Type Size (KB) Date
PDF 753 14 Mar 2014
PDF 1516 26 Jul 2011
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Software (1)

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