SLUUD60B October   2024  – May 2025 UCG28826

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
    5. 1.5 General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  8. 2Hardware
    1. 2.1 Additional Images
      1. 2.1.1 Using the EVM on a Load with USB-C PD Communication
      2. 2.1.2 Using the EVM on a Load Without USB-C PD Communication
  9. 3Implementation Results
    1. 3.1 Electrical Performance Specifications
    2. 3.2 Test Setup
      1. 3.2.1 Test Setup Requirements
      2. 3.2.2 Test Setup Diagram
      3. 3.2.3 Test Points
    3. 3.3 Performance Data and Typical Characteristic Curves
      1. 3.3.1  Efficiency Result of 4-Point Average on 20VOUT
      2. 3.3.2  Efficiency Result of 4-Point Average at 15VOUT
      3. 3.3.3  Efficiency Result of 4-Point Average at 9VOUT
      4. 3.3.4  Efficiency Result of 4-Point Average at 5VOUT
      5. 3.3.5  Efficiency Typical Results
      6. 3.3.6  Output Characteristics
      7. 3.3.7  Key Switching Waveforms
      8. 3.3.8  Switching Frequency vs Load
      9. 3.3.9  Output Ripple Voltage
      10. 3.3.10 Load Transient Response
      11. 3.3.11 Line Transient Response
      12. 3.3.12 Surge Test
      13. 3.3.13 Short Term Overload Operation
      14. 3.3.14 CCM operation
      15. 3.3.15 EN55022 Class B Conducted EMI Test Result
      16. 3.3.16 Thermal Images at Full Load (20V and 3.25A)
  10. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layouts
    3. 4.3 Transformer Details
      1. 4.3.1 RLTI-1464 (RENCO)
    4. 4.4 Bill of Materials
  11. 5Appendix - Efficiency
    1. 5.1 Efficiency Result of 4-Point Average on 20VOUT
    2. 5.2 Efficiency Result of 4-Point Average on 15VOUT
    3. 5.3 Efficiency Result of 4-Point Average on 9VOUT
    4. 5.4 Efficiency Result of 4-Point Average on 5VOUT
    5. 5.5 Efficiency Typical Results
  12. 6Additional Information
    1.     Trademarks
  13. 7Revision History

3.3.8 Switching Frequency vs Load

This section shows typical switching waveforms at different load conditions. YELLOW = Switch Node, GREEN= Vbulk, PINK - Vfb
UCG28826EVM-093 230Vac/0.6W (240khz burst frequency/ Vfb - 0.3V)Figure 3-25 230Vac/0.6W (240khz burst frequency/ Vfb - 0.3V)
UCG28826EVM-093 230Vac/1.2W (25kHz frequency - foldback / Vfb - 0.35V)Figure 3-26 230Vac/1.2W (25kHz frequency - foldback / Vfb - 0.35V)
UCG28826EVM-093 230Vac/5.3W (87kHz frequency/ Vfb - 0.7V)Figure 3-27 230Vac/5.3W (87kHz frequency/ Vfb - 0.7V)
UCG28826EVM-093 230Vac/17W (113kHz frequency/ Vfb - 1.1V)Figure 3-28 230Vac/17W (113kHz frequency/ Vfb - 1.1V)
UCG28826EVM-093 230Vac/25W (125kHz frequency/ Vfb - 1.2V)Figure 3-29 230Vac/25W (125kHz frequency/ Vfb - 1.2V)
UCG28826EVM-093 230Vac/45W (130kHz frequency/ Vfb - 1.7V)Figure 3-30 230Vac/45W (130kHz frequency/ Vfb - 1.7V)
UCG28826EVM-093 230Vac/65W (140kHz frequency/ Vfb - 1.9V)Figure 3-31 230Vac/65W (140kHz frequency/ Vfb - 1.9V)