SLVT249 May   2026

 

  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 Safety Warning
    3. 1.3 Dimensions
    4. 1.4 Test Setup
  8. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
      1. 2.3.1 PFC Stage
      2. 2.3.2 Thermal Image of System LLC Stage
      3. 2.3.3 Thermal Image of Backlight LLC Stage
    4. 2.4 PF Value
  9. 3Waveforms
    1. 3.1 Switching
      1. 3.1.1 PFC Switching waveform
      2. 3.1.2 System LLC Switching Waveform
      3. 3.1.3 Backlight Switching Waveform
    2. 3.2 Output Voltage Ripple
      1. 3.2.1 System LLC Output Ripple
      2. 3.2.2 Backlight LLC Output Ripple
    3. 3.3 Dynamic Response
      1. 3.3.1 Dynamic Response of the System LLC
      2. 3.3.2 Dynamic Response of the Backlight LLC
  10.   Trademarks

3.1.3 Backlight Switching Waveform

Backlight LLC Switching behavior is shown in Figure 3-8 through Figure 3-11.

CH1 is the waveform of switching node, CH6 is the primary side resonant current.

PMP23488 Switching Waveform at No Load; System Runs at 424.8KHz Figure 3-8 Switching Waveform at No Load; System Runs at 424.8KHz
PMP23488 Switching Waveform at 18.28V-10A; System Runs at 234.6KHz Figure 3-9 Switching Waveform at 18.28V-10A; System Runs at 234.6KHz
PMP23488 Switching Waveform at 20V-10A; System Runs at 182.9KHz Figure 3-10 Switching Waveform at 20V-10A; System Runs at 182.9KHz
PMP23488 Switching Waveform at 22.5V-10A. System Runs at 151.1KHz Figure 3-11 Switching Waveform at 22.5V-10A. System Runs at 151.1KHz