Two-phase interleaved LLC resonant converter reference design using C2000 MCU

Resonant converters are commonly used DC/DC converters commonly used in servers, telecommunications, automotive, industrial and other power applications. These converters have high performance (efficiency, power density, etc.) and are constantly increasing various industry standard requirements and power density targets, making them ideal for mid- to high-level power applications.

This reference design implements a 500W digitally controlled two-phase interleaved LLC resonant converter. The system is controlled by a single C2000™ microcontroller (MCU), the TMS320F280025C, which also generates PWM waveforms suitable for all power electronic switching devices in all operating modes. The design accurately achieves phase-to-phase current sharing by utilizing innovative current sharing technology.

NOTE: An older version of this design using F2837x devices is available in ControlSUITE .

characteristic

• ● Digitally controlled two-phase interleaved LLC resonant DC/DC converter
• ● Excellent inter-phase current sharing without any additional hardware
• ● Peak efficiency: 94.5%; when all loads exceed 10% of the rated load, the efficiency is greater than 90%
• ● Provides PowerSUITE support to easily adjust the software for custom power levels
• ● Fault protection: phase/output overcurrent, output overvoltage, and input undervoltage and overvoltage
• ● Phase cut with programmable limits