SLVUDN4A July   2026  – August 2026

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6. 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
  7. 2Hardware
    1. 2.1 Test Setup Requirements
    2. 2.2 Recommended Test Setups
    3. 2.3 Test Points
    4. 2.4 Terminals
  8. 3Performance Data and Typical Characteristic Curves
    1. 3.1  Efficiency Test Data for 28V Output Voltage
    2. 3.2  Efficiency Test Data for 24V Output Voltage
    3. 3.3  Efficiency Test Data for 20V Output Voltage
    4. 3.4  Efficiency Curve: Efficiency vs Output Power
    5. 3.5  Load Regulation
    6. 3.6  Startup Waveforms
    7. 3.7  Switching Frequency Across Load
    8. 3.8  Line Transient Response
    9. 3.9  Load Transient Waveform
    10. 3.10 Output Ripple Voltage
    11. 3.11 EN55022 Class B Conducted EMI Test Result
    12. 3.12 Thermal Performance at Maximum Load
    13. 3.13 PFC Test Results: Vin vs Iin
    14. 3.14 PFC Test Results: Switch node Waveforms across load
    15. 3.15 PFC Test Results: Efficiency (only PFC With External Vcc)
  9. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layouts
    3. 4.3 Transformer Details
    4. 4.4 Bill of Materials
  10. 5Additional Informations
    1.     Trademarks
  11. 6Revision History

3 Performance Data and Typical Characteristic Curves

The 120W two-stage AC/DC power supply combines a UCC28056-controlled PFC front-end stage utilizing the LMG3622 700V GaN FET as the power switch, followed by a UCG28828 (750V integrated GaN FETauxless flyback conversion stage). This power supply consistently delivers high efficiency across all three programmable output voltages — 28V, 24V, and 20V ; over the full universal input range of 90VAC to 264VAC.

The LMG3622 GaN-based PFC switch enables high-frequency, low-loss switching in the PFC stage, contributing directly to the overall system efficiency gains observed across all line and load conditions. At 28V output, peak efficiency reaches 95.23% at 264VAC full load, with 4-point average efficiency ranging from 92.13% at 90VAC to 94.05% at 264VAC. At 24V output, peak efficiency reaches 95.00% at 264VAC full load, with 4-point average efficiency ranging from 91.92% at 90VAC to 94.00% at 264VAC. At 20V output, peak efficiency reaches 94.82% at 264VAC full load, with 4-point average efficiency ranging from 91.82% at 90VAC to 93.71% at 264VAC. Across all output voltage settings, system efficiency consistently exceeds 92% at 50% load and above for all line conditions, with all results meeting DoE Level VI and CoC Tier 2 requirements for 120W external power supplies.

These measurements confirm that the combination of UCC28056, LMG3622, and UCG28828 sustains high conversion efficiency across the full output voltage range, load range, and universal input voltage range — validating the design for high-power-density adapter applications.