TIDT302 August   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Considerations
    4. 1.4 Dimensions
    5. 1.5 Test Setup
  5. 2Testing and Results
    1. 2.1 Load Regulation Graph
    2. 2.2 Efficiency Graphs
    3. 2.3 Efficiency Data
    4. 2.4 Thermal Images
  6. 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 uses a single UCC25800-Q1 device to drive two LLC transformers with 600-kHz switching frequency. This design uses the 750319177 transformer. The 750319177 is an off-the-shelf, catalog transformer featuring a low interwinding capacitance of 0.68 pF (typical) which is beneficial for minimizing common-mode current in gate driver bias applications with high slew rates. This design generates two isolated 18-V rails. Each output can be loaded to 1.5 W.