SPRADK6 September   2024 TMS320F280039 , TMS320F280039-Q1 , TMS320F280039C , TMS320F280039C-Q1 , TMS320F280049 , TMS320F280049-Q1 , TMS320F280049C , TMS320F280049C-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Challenge of Implementing LLC Control in MCU
    1. 2.1 Frequency Changing Requires Multiple PWM Configuration update
    2. 2.2 No Fixed Timing Relationship Between Control and Switching Frequency
  6. 3Corner Cases and Real-Case Challenges
    1. 3.1 Software Workaround
    2. 3.2 CLB-Based Hardware Workaround
  7. 4Summary
  8. 5References

4 Summary

This application note discusses the challenges of using Type-4 PWM in resonant converters. Even with advanced new features like PWM global and one-shot load, there are still some corners cases where unexpected PWM waveform would be generated due to incorrect PWM settings or PWM peripheral imperfections. Both software and hardware solution based on CLB have been proposed to handle the PWM abnormal challenges.