TIDUF59 March   2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 PFC Inductance Design
      2. 2.2.2 Configuration of CS pin in LMG3622
      3. 2.2.3 AHB Topology and the VCC Design
      4. 2.2.4 LMG2610 for AHB Topology
    3. 2.3 Highlighted Products
      1. 2.3.1 UCC28056
      2. 2.3.2 LMG3622
      3. 2.3.3 LMG2610
  9. 3Hardware, Test Requirements, and Test Results
    1. 3.1 Hardware
    2. 3.2 Test Setup
    3. 3.3 Test Results
      1. 3.3.1 Switching Waveform
        1. 3.3.1.1 Switching Waveform on the PFC Stage
        2. 3.3.1.2 Switching Waveform on the AHB Stage
      2. 3.3.2 Efficiency Test Result
      3. 3.3.3 Thermal Test Result
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
      3. 4.1.3 Layout Prints {Optional Section}
    2. 4.2 Tools
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author

Description

This reference design is a gallium nitride (GaN) based, 140W AC-DC power with high efficiency and power density. The design supports wide input (90V–264VAC) and output (5V–28V) voltage. The Power Factor Correction (PFC) is designed with UCC28056 which is a Transient Mode (TM) boost PFC controller plus LMG3622 device which is a 650V, 120mΩ GaN device with integrated driver. The DC-DC stage was designed by Asymmetric Half-Bridge Flyback (AHB) plus LMG2610 which is a 650V asymmetric half-bridge GaN (170mΩ–248mΩ) device with high- and low-side driver, level shift, and bootstrap diode integrated in 7mm × 9mm QFN package to minimize the PCB space. This reference design is customized for the application, such as the adapter design for USB power delivery (PD) 3.1 and the charger for power tools.