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

3.3.3 Thermal Test Result

The worst case of the thermal result was at full load (28V, 5A) condition. The system burn in was for > 50 minutes at room temperature with the thermal camera.

Table 3-14 shows the thermal test results.

Table 3-14 Thermal Result at 28V-5A Load Condition
VIN VPFC LMG2610 AHB CONTROLLER LMG3622 PFC DIODE
90V, 50Hz 390V 92.9°C 95.2°C 100.9°C 99.5°C
90V, 50Hz 320V 96.1°C 87.9°C 98.2°C 98.9°C
115Vac, 60Hz 390V 88.1°C 90.0°C 85.8°C 90.2°C
115Vac, 60Hz 320V 92.1°C 82.9°C 84.8°C 90.2°C
230Vac, 50Hz 390V 80.7°C 80.7°C 70.8°C 74.8°C
264Vac, 63Hz 390V 79.5°C 97.7°C 68.8°C 72.3°C
GUID-20231208-SS0I-QRJT-15L1-HMXDPPWCG7LW-low.jpgFigure 3-29 Thermal Result at VIN = 90Vac, 50Hz (VPFC = 390V)
GUID-20231208-SS0I-CCZ0-B03Q-SK3QKZNZTXC0-low.jpgFigure 3-31 Thermal Result at VIN = 115Vac, 60Hz (VPFC = 390V)
GUID-20231208-SS0I-ZTX7-8K9G-QG6CFBTN6KJ0-low.jpgFigure 3-33 Thermal Result at VIN = 230Vac, 50Hz (VPFC = 390V)
GUID-20231208-SS0I-4VDB-LMHN-MDXZMGW46TGC-low.jpgFigure 3-30 Thermal Result at VIN = 90Vac, 50Hz (VPFC = 320V)
GUID-20231208-SS0I-GM3J-MG2G-C4JLPKXBZJDC-low.jpgFigure 3-32 Thermal Result at VIN = 115Vac, 60Hz (VPFC = 320V)
GUID-20231208-SS0I-XWQW-41ZB-Q090FQQXRMHT-low.jpgFigure 3-34 Thermal Result at VIN = 264Vac, 63Hz (VPFC = 390V)