SLVT236 December   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Dimensions
  7. 2Testing and Results
    1. 2.1 Efficiency Graph
    2. 2.2 Load Regulation
    3. 2.3 Thermal Images
    4. 2.4 Bode Plots
      1. 2.4.1 195VAC Input Voltage
      2. 2.4.2 230VAC Input Voltage
      3. 2.4.3 265VAC Input Voltage
  8. 3Waveforms
    1. 3.1 Switching
      1. 3.1.1 Primary Switch-node
      2. 3.1.2 Secondary Switch-node
        1. 3.1.2.1 195VAC Input Voltage
        2. 3.1.2.2 230VAC Input Voltage
          1. 3.1.2.2.1 30mA Output Current
          2. 3.1.2.2.2 200mA Output Current
          3. 3.1.2.2.3 2.5A Output Current
        3. 3.1.2.3 265V Input Voltage
    2. 3.2 Output Voltage Ripple
    3. 3.3 Input Voltage Ripple
    4. 3.4 Load Transients
      1. 3.4.1 1.25A to 2.5A Load Steps
      2. 3.4.2 0.4A to 2.5A Load Steps
      3. 3.4.3 0A to 2.5A Load Steps
    5. 3.5 Start-up Sequence
      1. 3.5.1 195VAC Input Voltage
      2. 3.5.2 265VAC Input Voltage
    6. 3.6 Shutdown Sequence
  9. 4Trademarks

Description

This reference design generates a 24V output with 2.5A load current from a 195VAC to 265VAC input. This design uses the self-biasing gallium nitride (GaN) flyback UCG28826. This design can deliver 60W output power. The design does not need an auxiliary transformer winding because this device has a self-bias and auxless sensing scheme integrated. The design operates at 130kHz switching frequency for full load and reduces switching frequency for medium or light load to keep efficiency high.