TIDT225 March   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 Graphs
    3. 3.3 Efficiency and Power Dissipation Data
    4. 3.4 Cross Regulation
    5. 3.5 Loop Gain
  4. 4Waveforms
    1. 4.1 Start-up
    2. 4.2 Switching Waveforms
    3. 4.3 Output Voltage Ripple
    4. 4.4 Load Transients

1 Description

This isolated primary regulated flyback converter provides a total of eight output voltages. These outputs consist of four isolated pairs of +18-V and –5.1-V outputs, with three pairs capable of 25 mA maximum for and one capable of 75 mA maximum. These outputs are designed to be used as an IGBT driver bias supply for a total of six IGBTs (25 mA for three high-side drivers and 75 mA for three low-side drivers). It operates over an input voltage range of 7 V–32 V in a compact form factor with a single transformer.

GUID-20210219-CA0I-ZL4R-HX4R-B81PN7GLL4RV-low.jpgFigure 1-1 Top of PCB
GUID-20210219-CA0I-WJXL-L65D-DKLKLZKSQQC0-low.jpgFigure 1-2 Bottom of PCB