TIDT244 July   2021

 

  1. 1Description
  2. 2Test Prerequisites
    1. 2.1 Voltage and Current Requirements
    2. 2.2 Required Equipment
  3. 3Testing and Results
    1. 3.1 Thermal Images
    2. 3.2 Efficiency and Power Dissipation Graph
    3. 3.3 Efficiency and Power Dissipation Data
    4. 3.4 Current Regulation
    5. 3.5 Voltage Regulation
  4. 4Waveforms
    1. 4.1 Start-up
    2. 4.2 Switch Node
    3. 4.3 Output Voltage Ripple
    4. 4.4 Current Loop to Voltage Loop Transition
    5. 4.5 Voltage Loop to Current Loop Transition
    6. 4.6 Bias Voltage Start-up
    7. 4.7 Bias Voltage Switch Nodes
    8. 4.8 Output Current Sense Signal

Start-up

The following figures show the output voltage start-up waveform (YELLOW), the ENABLE waveform (BLUE), and the output current waveform (RED) under two different output conditions.

GUID-20210611-CA0I-WBX2-N1ZV-BDZGWTRZSGL5-low.pngFigure 4-1 VIN = 400 V and VOUT = 400 V at 2 A. Resistive Load (VOUT: 100 V/DIV, ENABLE: 5 V/DIV, IOUT: 2 A/DIV, 400 ms/DIV, BWL = 20 MHz)
GUID-20210611-CA0I-6SGZ-TVX8-XFCXPZB4NCZ8-low.pngFigure 4-2 VIN = 400 V and VOUT = 400 V at 40 mA. Resistive Load (VOUT: 100 V/DIV, ENABLE: 5 V/DIV, IOUT: 100 mA/DIV, 400 ms/DIV, BWL = 20 MHz)