SLVT230 November   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Considerations
    4. 1.4 Safety Considerations
    5. 1.5 Dimensions
    6. 1.6 Test Setup
  8. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
    4. 2.4 Bode Plots
  9. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Load Transients
    4. 3.4 Start-Up Sequence
    5. 3.5 Shut-down Sequence
  10. 4Static Regulation
  11. 5Transformer Details
    1. 5.1 Material List
    2. 5.2 Winding Details
    3. 5.3 Schematic
    4. 5.4 Winding Instructions
    5. 5.5 Details about Core, Air Gap and Bobbin
    6. 5.6 Bobbin Mechanical Details
  12.   Trademarks

Description

This reference design is an offline isolated flyback. The AC-DC power stage is based on the UCC28750 fixed-frequency peak current mode controller, which features continuous conduction mode (CCM) and discontinuous conduction mode (DCM) modulation, as well as secondary-side regulation. Frequency foldback and burst mode improve light-load efficiency while frequency dithering reduces electromagnetic interference (EMI) signature. The controller provides several protection features, including over-under voltage lockout, Vout overvoltage, overpower, and short-circuit protections.