TIDUEZ7 August   2021

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   5
  6. 1System Description
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
    4. 2.4 System Design Theory
      1. 2.4.1 Buck Converter Circuit Design Using TPS62903
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
    3. 3.3 Test Results
      1. 3.3.1 Startup
      2. 3.3.2 Load Transient
      3. 3.3.3 Output Ripple
      4. 3.3.4 Efficiency
      5. 3.3.5 Thermal Performance
      6. 3.3.6 Output Voltage vs. Output Current
  9. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
      3. 4.1.3 PCB Layout Recommendations
        1. 4.1.3.1 Layout Prints
      4. 4.1.4 Altium Project
      5. 4.1.5 Gerber Files
      6. 4.1.6 Assembly Drawings
    2. 4.2 Documentation Support
    3. 4.3 Support Resources
    4. 4.4 Trademarks
  10. 5About the Author

3.3.5 Thermal Performance

Thermal Performance at 3-A, 2-A, and 1-A Load. The images are taken under room temperature of about 27C. No air flow and the thermal camera placed horizontal 5-inches from the camera. The peak temperature measured right at the center of the board where the inductor and the converter are located. The TPS62903 is designed for maximum junction temperature of 150C.

Figure 3-9 Thermal Image at Room Temperature with 12-Vin, 1.2-Vo, 3-A
Figure 3-10 Thermal Image at Room Temperature with 12-Vin, 1.2-Vo, 2-A
Figure 3-11 Thermal Image at Room Temperature with 12-Vin, 1.2-Vo, 1-A.