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

1 Introduction

In the case of the PFC circuit block of the Switched Power supply that was designed and applied before writing this application note, the power loss difference due to FET conduction loss is large depending on the AC input voltage condition, That is, the low line voltage and the high line voltage, so the power loss in the low-voltage line is greater than that in the high-voltage line. In particular, the switching FET and the PFC inductor generate more losses than the other components. To improve this problem, the design was designed to modify the output current waveform of the AC low line by configuring an external circuit to reduce power loss to be equal to the high line and to stabilize the DC/DC operation connected to the PFC.