TIDT219 February   2023

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Dimensions
  5. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
    4. 2.4 Bode Plots
    5. 2.5 Electromagnetic Interference (EMI)
  6. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Short-Circuit Protection
    4. 3.4 Load Transients
    5. 3.5 Start-up Sequence

Description

This reference design uses the UCC2897A active clamp forward controller to convert 176–264-VAC input to a 24-VDC output with a maximum power of 150 W. The UCC5304 isolated gate driver is used to drive the high-voltage clamp FET. The design achieves > 92% efficiency with diode rectification. Secondary-side current sense provides precise overcurrent protection through a constant-current regulation loop. This design is tested for CISPR 32 Class B conducted emissions.