TIDT279 October   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Power and Load Connections and Test Points
    2. 1.2 Voltage and Current Requirements
    3. 1.3 Required Equipment
    4. 1.4 Considerations
    5. 1.5 Board Dimensions
  5. 2Testing and Results
    1. 2.1 Efficiency and Loss Graphs
    2. 2.2 Thermal Images
    3. 2.3 Bode Plots
    4. 2.4 Conducted Emissions vs CISPR Class 5
  6. 3Waveforms
    1. 3.1 Output Voltage Ripple
    2. 3.2 Load Transients
    3. 3.3 Start-Up of Each Independently-Controlled Output

1.4 Considerations

When powering the board, the input voltage range must be 6 V to 18 V. All three outputs come up unless jumpers are placed on J88, J55, or J33 to disable the 8 V, 5 V, or 3.3 V, respectively. With each output loaded, switching frequency is approximately 440 kHz with dithering.

When testing for surges with input in the 18-V to 42-V range for more than a few seconds, use a fan blowing on the board.