TIDT224 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 Voltage Regulation Graphs
    5. 3.5 Cross-Load Voltage Regulation Data and Efficiency
  4. 4Waveforms
    1. 4.1 Start-up Sequence
    2. 4.2 Switch Node
    3. 4.3 Output Voltage Ripple
    4. 4.4 Load Transients


This isolated primary-side regulated (PSR) flyback converter provides dual 15-V outputs at 100 mA each. It was designed to provide bias power for a rotor coil excitation gate-driver in motor and inverter applications. The isolated output voltage is sampled from the primary-side flyback voltage, eliminating the need for an optocoupler, voltage reference, or third winding from the transformer for output voltage regulation. It offers a high level of integration, low cost, and high efficiency in a compact form factor.

GUID-20210223-CA0I-BHFS-QN6R-19HZKVBCNHJS-low.jpgFigure 1-1 Top-Side Photo of PCB