TIDT379 December   2023

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Dimensions
  6. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Image
    4. 2.4 EMI
  7. 3Waveforms
    1. 3.1 Switching Node and Output Voltage Ripple
    2. 3.2 Start-Up Sequence

Description

This reference design demonstrates a buck converter using the UCC28881 that converts a 120-Vac input to a 3.3-Vdc output. The use of a coupled inductor helps maintain a longer on-time while achieving an extreme conversion ratio for a non-isolated topology. Like other buck topologies this design makes a low-voltage ripple output while using minimal output capacitance.