TIDT432 March   2025

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Dimensions
  6. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Load Regulation
    4. 2.4 Thermal Images
  7. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Load Transients
    4. 3.4 Start-up Sequence

Description

This reference design introduces a tiny auxiliary power supply unit (PSU) used to supply automotive insulated-gate bipolar transistor (IGBT) or automotive silicon carbide (SiC) drive. The isolated outputs support three gate controls, each supplied with +21.2V, 2W output. This design uses the planar transformer to reduce the board height and cost. The LM25184-Q1 controller supports primary-side regulation by controlling the flyback voltage from secondary side. There is no need for an additional auxiliary winding. The board maximum efficiency is 89.2%. The design uses six PCB layers, and the temperature rise is just 16°C with full load 6W.