SLVUDT7 April   2026

 

  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 Image
      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 of UCG28846DREVM-151
      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 at 24Vout
      2. 3.3.2  Efficiency Result of 4-Point Average on 20VOUT
      3. 3.3.3  Efficiency Result of 4-Point Average at 15VOUT
      4. 3.3.4  Efficiency Result of 4-Point Average at 12Vout
      5. 3.3.5  Efficiency Result of 4-Point Average at 9VOUT
      6. 3.3.6  Efficiency Result of 4-Point Average at 5VOUT
      7. 3.3.7  Efficiency Typical Results
      8. 3.3.8  Output Characteristics
      9. 3.3.9  Key Switching Waveforms
      10. 3.3.10 Switching Frequency versus Load
      11. 3.3.11 Output Ripple Voltage
      12. 3.3.12 Load Transient Response
      13. 3.3.13 Line Transient Response
      14. 3.3.14 Short Term Overload Operation
      15. 3.3.15 CCM operation
      16. 3.3.16 Startup Performance
      17. 3.3.17 Thermal Images at Full Load (20V/3.25A and 24V/2.71A)
      18. 3.3.18 CISPR32 Class B Conducted EMI Test Result
  10. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layouts
    3. 4.3 Transformer Details
    4. 4.4 Bill of Materials
  11. 5Additional Information
    1.     Trademarks

3.3.10 Switching Frequency versus Load

This section shows typical switching waveforms at different load conditions at 230Vac input and 20V output. Ch1 - Output Voltage, Ch2 - Bulk Capacitor Voltage, Ch3 - Switch Node Voltage, and Ch4 - FB pin Voltage

UCG28846DREVM-151 230Vac/0.4W (25khz Burst Frequency/ Vfb - 0.27V)Figure 3-34 230Vac/0.4W (25khz Burst Frequency/ Vfb - 0.27V)
UCG28846DREVM-151 230Vac/10W (40kHz Frequency-Foldback/ Vfb - 1.34V)Figure 3-36 230Vac/10W (40kHz Frequency-Foldback/ Vfb - 1.34V)
UCG28846DREVM-151 230Vac/40W (91kHz 6th Valley Switching/ Vfb - 1.71V)Figure 3-38 230Vac/40W (91kHz 6th Valley Switching/ Vfb - 1.71V)
UCG28846DREVM-151 230Vac/3W (25kHz Frequency-Foldback / Vfb - 0.98V)Figure 3-35 230Vac/3W (25kHz Frequency-Foldback / Vfb - 0.98V)
UCG28846DREVM-151 230Vac/16W (53kHz Frequency-Foldback/ Vfb - 1.45V)Figure 3-37 230Vac/16W (53kHz Frequency-Foldback/ Vfb - 1.45V)
UCG28846DREVM-151 230Vac/65W (115kHz 3rd Valley Switching/Vfb - 1.93V)Figure 3-39 230Vac/65W (115kHz 3rd Valley Switching/Vfb - 1.93V)