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

Abstract

Nowadays, topologies that requiring PWM phasing-shifting and frequency-changing have been widely used in digital power applications. Complicated topologies like multi-phase interleaved LLC have been introduced as the result of demand for higher efficiency and higher power level. To handle the challenge, Type-4 PWM is introduced on TI generation 3 C2000 devices. Especially, new features like global load and one shot reload would significantly simplify implementation phase-shifting and frequency changing topology. This application note discusses the benefit of these new features, and how to deal with corner cases in real practice.