TIDM-RESLLC-DCDC Reference Design

Texas Instruments

Resonant LLC Half-Bridge DC/DC Converter

Description

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 converter375-405V DC input: 12 DC output: 25A rated output (300W)>90% efficiency across wide load range with >93% peak efficiencySynchronous rectification support for increased power efficiencyZero voltage switching (ZVS) across entire load range for greater efficiency and reliabilityConvenient GUI for initial design evaluation: and detailed step-by-step documentation for further depth of evaluationNOTE: 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."
Applications
  • Rack & server PSU with 48-V output
  • Merchant telecom rectifiers
  • Battery backup unit (BBU)
  • Server PSU with 12-V output
Product Categories
  • Arm-based microcontrollers

Parts

Part Number Name Companion Part
TMS320F28027 TMS320F28027 Buy Datasheet

Bill Of Materials

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Schematic

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