TIDT192 October   2020


  1.   Description
  2. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Considerations
    4. 1.4 Dimensions
  3. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Thermal Images
    3. 2.3 Frequency Response
  4. 3Waveforms
    1. 3.1 Start-up
    2. 3.2 Switching Waveforms


This reference design provides up to 265-W constant voltage and constant current output from an 120-VAC input with a single-stage LCC resonant converter stage. The BOM cost of this design is highly optimized with the single-stage structure and the use of UCC256403 driver integrated LLC Resonant Controller. A UCC28910 primary-side regulated Flyback is applied as a bias coverter and allows the main power stage to be turned on and off. This design is able to achieve 88% peak efficiency with over 200-kHz switching frequency at 120 VAC.

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