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

2.3.2 LMG3622

GUID-20231109-SS0I-5K7Z-R72W-NHBXTWR6JMJD-low.svg Figure 2-10 LMG3622 Functional Block Diagram

The LMG3622 is a 650V 120mΩ GaN power FET intended for switch-mode power-supply applications. The LMG3622 simplifies design and reduces component count by integrating the GaN FET and gate driver in a 8mm by 5.3mm QFN package.

Programmable turn-on slew rates provide EMI and ringing control. The current-sense emulation feature reduces power dissipation compared to the traditional current-sense resistor and allows the low-side thermal pad to be connected to the cooling PCB power ground.

Low quiescent currents and fast start-up times support converter light-load efficiency requirements and burst-mode operation.

Extended feature descriptions are provided in the following list:

  • 650V, 120mΩ GaN power FET
  • Integrated gate driver with low propagation delays and adjustable turn-on slew-rate control
  • Current-sense emulation with high bandwidth and high accuracy
  • Cycle-by-cycle overcurrent protection
  • Overtemperature protection with FLT pin reporting
  • AUX quiescent current: 240μA
  • AUX standby quiescent current: 50μA
  • Maximum supply and input logic pin voltage: 26V
  • 8mm × 5.3mm QFN package with thermal pad