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  • 3-Phase Input Valley Switching Flyback With Two Outputs Reference Design

    • TIDT321 January   2023

       

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  • 3-Phase Input Valley Switching Flyback With Two Outputs Reference Design
  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Dimensions
  5. 2Testing and Results
    1. 2.1 Efficiency and Load Regulation Graphs
    2. 2.2 Thermal Images
    3. 2.3 Bode Plots
  6. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Load Transients
    4. 3.4 Start-Up Sequence
    5. 3.5 Other Waveforms
  7. IMPORTANT NOTICE
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TEST REPORT

3-Phase Input Valley Switching Flyback With Two Outputs Reference Design

Description

This reference design uses the UCC28742 flyback controller to generate two outputs (23 V at 1.0 A, 5.0 V at 0.15 A) from a 3-phase input. The UCC28742 uses an optical coupler to regulate the output and to improve transient response. The valley-switching technique reduces switching losses and keeps the efficiency high.

Features

  • Resonant-ring valley-switching operation
  • Dual outputs: 23 V at 1.0 A and 5.0 V at 0.15 A
  • 3-phase AC input voltage: 332 VAC–459 VAC
  • Output overvoltage and overcurrent protection
  • Completely tested design with available design files and test report

Applications

  • Residential water heater and heating system
GUID-20221220-SS0I-WTQ7-5QJC-3CFNHQWVG06C-low.jpgTop Photo
GUID-20221220-SS0I-2C3R-HBFG-1XVDCMTCMQN6-low.jpgTop Photo 2
GUID-20221220-SS0I-LNWF-LZXM-QSMJLW6KBVVB-low.jpgBottom Photo

1 Test Prerequisites

 

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