TIDT348 august   2023

 

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

Description

This reference design converts universal AC input to an isolated 12 V at 1.5-A output and an isolated 5 V at 0.2-A output. The design achieves a peak efficiency of 92.7%. The design features the UCC28781-Q1 which is a zero-voltage switching (ZVS) flyback controller to minimize switching losses, the UCC5350, a reinforced isolated gate driver to drive the synchronous rectifier MOSFET, and the TPS629203, a synchronous buck converter with low quiescent current.