Two Phase Interleaved LLC Resonant Converter Reference Design Using C2000™ MCUs
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Key Document


Resonant converters are popular DC-DC converters frequently used in server, telecom, automotive, industrial and other power supply applications. Their high performance (efficiency, power density, etc.), improving requirements of the various industry standards, and the ever increasing power density goals have made these converters a good choice for medium to high power applications.

This design implements a digitally controlled 500W two phase interleaved LLC resonant converter. The system is controlled by a single C2000™ microcontroller (MCU), TMS320F28379, which also generates PWM waveforms for all power electronic switching devices under all operating modes. This design implements a novel current sharing technique to accurately achieve current balancing between phases.

  • Digitally controlled two phase interleaved LLC resonant DC-to-DC converter
  • Excellent current sharing between phases without any additional hardware
  • Peak efficiency: 94.5%. Efficiency > 90% for all loads above 10% of rated load
  • powerSUITE support for easy adaptation of software for a customized power level
  • Fault protection: phase/output over-current, output over-voltage, and input under-voltage and overvoltage
  • Phase shedding with programmable limits

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Schematic/Block Diagram

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Design Guide

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TI Devices (6)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
OPA365  2.2V, 50MHz, Low-Noise, Single-Supply Rail-to-Rail Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
PTH08080W  2.25 A, 4.5-V to 18-V Input Wide Adjust Miniature Power Module  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TMS320F28379D  Delfino™ 32-bit MCU with 800 MIPS, 2xCPU, 2xCLA, FPU, TMU, 1024 KB Flash, CLB, EMIF, 16b ADC  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
UCC27524A  Dual, 5A, High-Speed Low-Side Power MOSFET Driver, with Negative Input Voltage Ability  Gate drivers  Sample & Buy View Design Kits & Evaluation Modules
UCD7138  Low-Side Power MOSFET Driver With Body Diode Conduction Sensing  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
OPA365 Download Download
Download Download
PTH08080W Download -
Download -
TMS320F28379D Download Download
Download Download
TPS795 Download
UCC27524A Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 19405 21 Mar 2017
White papers (1)
Title Type Size (KB) Date
PDF 3648 07 Jul 2017
Design files (6)
Title Type Size (KB) Date
PDF 3925 05 Apr 2017
ZIP 278 05 Apr 2017
ZIP 2433 05 Apr 2017
PDF 782 21 Mar 2017
PDF 119 21 Mar 2017
PDF 1356 21 Mar 2017
Related Tools & Software

Development Tools (1)

Name Part Number Tool Type
powerSUITE - Digital Power Supply Design Software Tools for C2000™ MCUs  POWERSUITE  SW Development Tools, IDEs, Compilers 

Software (1)

Name Part Number Software Type
controlSUITE™ Software Suite: Software and Development Tools for C2000™ Microcontrollers  CONTROLSUITE  Software Libraries 

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