SLVT223 August   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Magnetics Construction
      1. 1.2.1 LLC Transformer
      2. 1.2.2 Resonant Inductor
    3. 1.3 Considerations
    4.     General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
    5. 1.4 Precautions
    6. 1.5 Dimensions
  7. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
      1.      225V Input Voltage
      2.      250V Input Voltage
      3.      300V Input Voltage
      4.      350V Input Voltage
      5.      400V Input Voltage
      6.      450V Input Voltage
    3. 2.3 Load Regulation
    4. 2.4 Thermal Images
      1. 2.4.1 Top Side
      2. 2.4.2 Bottom Side
    5. 2.5 Bode Plots
  8. 3Waveforms
    1. 3.1 Switching
      1. 3.1.1 Switching Primary Side
        1. 3.1.1.1 225V Input Voltage
        2. 3.1.1.2 300V Input Voltage
        3. 3.1.1.3 350V Input Voltage
        4. 3.1.1.4 400V Input Voltage
        5. 3.1.1.5 450V Input Voltage
      2. 3.1.2 Switching Secondary Side
        1. 3.1.2.1 225V Input Voltage
        2. 3.1.2.2 300V Input Voltage
        3. 3.1.2.3 350V Input Voltage
        4. 3.1.2.4 400V Input Voltage
        5. 3.1.2.5 450V Input Voltage
    2. 3.2 Output Voltage Ripple
      1. 3.2.1 225V Input Voltage
      2. 3.2.2 350V Input Voltage
      3. 3.2.3 450V Input Voltage
    3. 3.3 Load Transients
      1. 3.3.1 225V Input Voltage
      2. 3.3.2 350V Input Voltage
      3. 3.3.3 450V Input Voltage
    4. 3.4 Start-up Using Secondary Side Soft-Start
      1. 3.4.1 Start-Up Under No Load Conditions
        1. 3.4.1.1 225V Input Voltage
        2. 3.4.1.2 350V Input Voltage
        3. 3.4.1.3 450V Input Voltage
      2. 3.4.2 Start-up under Full Load Conditions
        1. 3.4.2.1 225V Input Voltage
        2. 3.4.2.2 350V Input Voltage
        3. 3.4.2.3 450V Input Voltage
  9. 4Trademarks

1.2.1 LLC Transformer

Core: PQ32/30 with 250µm gap

12 turns (primary), 1 turn (auxiliary), 3 turns (secondary 1), 3 turns (secondary 2)

Primary: 90.2µH, Aux: 0.67µH, Secondary 1: 5.83µH, Secondary 2: 5.83µH, Leakage: 6.57µH