SLUAAH1 December   2021 UCC24624

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 LLC Resonant Converter
    2. 1.2 Synchronous Rectification (SR)
      1. 1.2.1 Diode Rectification and Synchronous Rectification
      2. 1.2.2 Power Loss for Synchronous Rectification
      3. 1.2.3 UCC24624 Introduction
  3. 2Configurations of Secondary Rectifier Circuit using UCC24624
    1. 2.1 Typical Configuration
    2. 2.2 Single SR Controller with Paralleled MOSFETs Configuration
    3. 2.3 Dual SR Controllers with Paralleled MOSFETs Configuration
    4. 2.4 Multi SR Controllers with Matrix Transformer Configuration
  4. 3Summary
  5. 4References

1.1 LLC Resonant Converter

LLC resonant converter is one of the most popular isolated DC-DC Converter because of its advantages of simple control, wide voltage gain regulation capability, and soft switching operation. It operates at 50% duty cycle and power flow is controlled by modulating the switching frequency.

In an LLC resonant converter, the zero-voltage switching (ZVS) at turn-on for the primary-side MOSFETs and zero-current switching (ZCS) at turn-off the rectifiers in the secondary-side can be achieved. Resonant operation of all switching devices in the LLC converter results in minimum switching loss and increased overall efficiency, especially at high operating frequency in the hundreds of kilohertz to Megahertz range.