Two Phase Interleaved LLC Resonant Converter Reference Design Using C2000™ MCUs
TIDM-1001
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Key Document

Description

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), TMS320F280025C, 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.

NOTE:  There is an older version of this design using F2837x device available in ControlSUITE.

Features
  • 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 (10)

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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) regulators  Sample & Buy View Design Kits & Evaluation Modules
TMS320F280021  C2000™ 32-bit MCU with 100 MHz, FPU, TMU, 32-KB flash  Microcontrollers (MCU)  Not Available View Design Kits & Evaluation Modules
TMS320F280023  C2000™ 32-bit MCU with 100 MHz, FPU, TMU, 64-KB flash  Microcontrollers (MCU)  Not Available View Design Kits & Evaluation Modules
TMS320F280023C  C2000™ 32-bit MCU with 100 MHz, FPU, TMU, 64-KB flash, CLB  Microcontrollers (MCU)  Not Available View Design Kits & Evaluation Modules
TMS320F280025  C2000™ 32-bit MCU with 100 MHz, FPU, TMU, 128-KB flash  Microcontrollers (MCU)  Not Available View Design Kits & Evaluation Modules
TMS320F280025C  C2000™ 32-bit MCU with 100 MHz, FPU, TMU, 128-KB flash, CLB  Microcontrollers (MCU)  Sample & Buy View Design Kits & Evaluation Modules
TPS795  500-mA, low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules
UCC27524A  5-A/5-A dual-channel gate driver with 5-V UVLO, enable, and negative input voltage handling  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 -
TPS795 Download
Download
UCC27524A Download
Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 14320 02 Jan 2020
White papers (2)
Title Type Size (KB) Date
PDF 900 17 Jun 2020
PDF 3648 07 Jul 2017
Design files (6)
Title Type Size (KB) Date
PDF 658 03 Apr 2020
PDF 2165 03 Apr 2020
ZIP 400 03 Apr 2020
ZIP 2499 03 Apr 2020
PDF 782 21 Mar 2017
PDF 119 21 Mar 2017
Related Tools & Software

Software development (2)

Name Part Number Software Type
powerSUITE - Digital Power Supply Design Software Tools for C2000™ MCUs  POWERSUITE  IDEs, configuration, compilers & debuggers 
DigitalPower software development kit (SDK) for C2000™ MCUs  C2000WARE-DIGITALPOWER-SDK  Software development kits (SDK) 


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