SLUUBZ3C May   2020  – October 2022 LMG2610 , UCC28782

 

  1. 1 Using the UCC28782EVM-030 65-W USB-C PD High-Density Active-Clamp Flyback Converter
    1.     Trademarks
  2. 2 General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  3. 3 Description
  4. 4 Electrical Performance Specifications
  5. 5 Schematic Diagram
  6. 6 Description
    1. 6.1 Typical Application
    2. 6.2 Using the EVM on a Load with USB-C PD Communication
    3. 6.3 Using the EVM on a Load without USB-C PD Communication
  7. 7 Test Setup
    1. 7.1 Test Setup Requirements
    2. 7.2 Test Setup Diagram
    3. 7.3 Test Points
  8. 8 Performance Data and Typical Characteristic Curves
    1. 8.1  Efficiency Result of 4-Point Average on 20-Vout
    2. 8.2  Efficiency Result of 4-Point Average at 15-Vout
    3. 8.3  Efficiency Result of 4-Point Average at 9-Vout
    4. 8.4  Efficiency Result of 4-Point Average at 5-Vout
    5. 8.5  Efficiency Typical Results
    6. 8.6  Output Characteristics
    7. 8.7  Switching Frequency
    8. 8.8  Key Switching Waveforms and Operation Mode Load Current
    9. 8.9  Start Up
    10. 8.10 Output Voltage Adjustment by USB-C PD
    11. 8.11 Line Transient Response
    12. 8.12 Output Ripple Voltage
    13. 8.13 Boost Function for VDD Bias
    14.     29
    15. 8.14 X-Capacitor Discharge
    16. 8.15 USB-C PD Over Current Limit
    17. 8.16 Load Transient Response
    18. 8.17 EN55022 Class B Conducted EMI Test Result
    19. 8.18 Thermal Images at Full Load (20V and 3.25 A)
  9. 9 Transformer Details
  10. 10EVM Assembly and Layout
  11. 11List of Materials
  12. 12Revision History

8.7 Switching Frequency

GUID-133359F5-048C-4DC4-BB08-1F9BF37E84C2-low.pngFigure 8-7 Average Switching Frequency vs. Input at 20-Vo Full Load
GUID-F02AC759-B8D9-43F2-9C23-23DE01144B2D-low.pngFigure 8-8 Maximum switching frequency about 240 kHz (Yellow = PWML, Green = Transformer Primary Winding Current, Red = Switch Node Voltage