SLUAAY1 October   2024 UCC28064A

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Interleaving PFC Principle of Operation
  6. 3Original PFC Design with Internal Line Feed-Forward block
  7. 4Current Phenomenon of Operating With UCC28064A Internal Line Feed Forward Function
  8. 5Achieving Adaptive Current Control PFC With UCC28064A
  9. 6Test Results Comparing Original PFC Design to Adaptive PFC Design
  10. 7Summary
  11. 8References

Abstract

High-end TV and Monitor Switch-Mode Power Supplies (200-500W) commonly implement interleaved (two phase) critical conduction mode (CrCM, also called Transition mode-TM) PFC (Power Factor Correction) block, to improve efficiency and reduce design volume (height). This application note describes how to achieve higher efficiency to reduce power loss further and alleviate thermal challenge at low AC line condition without topology and power stage change. A simple external circuit is introduced here and the working principle is elaborated. Measurement shows 1-2% efficiency boost depending on the load conditions.