TIDT373 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
    2. 2.2 Standby Power
    3. 2.3 Load Regulation
    4. 2.4 Line Regulation
    5. 2.5 Thermal Images
      1. 2.5.1 43 VAC Input Voltage
      2. 2.5.2 274 VAC Input Voltage
    6. 2.6 Bode Plots
  7. 3Waveforms
    1. 3.1 Switch Node Voltage
      1. 3.1.1 40 VDC Input Voltage
        1. 3.1.1.1 No Load
        2. 3.1.1.2 100-mA Load Current
        3. 3.1.1.3 1-A Load Current
      2. 3.1.2 630-VDC Input Voltage
        1. 3.1.2.1 No Load
        2. 3.1.2.2 500-mA Load Current
        3. 3.1.2.3 1-A Load Current
    2. 3.2 Output Voltage Ripple
      1. 3.2.1 40-VDC Input Voltage
      2. 3.2.2 325-VDC Input Voltage
      3. 3.2.3 630 VDC Input Voltage
    3. 3.3 Input Voltage Ripple
    4. 3.4 Load Transients
      1. 3.4.1 40-VDC Input Voltage
      2. 3.4.2 325-VDC Input Voltage
      3. 3.4.3 630-VDC Input Voltage
    5. 3.5 Start-Up Sequence
      1. 3.5.1 With Load
        1. 3.5.1.1 43-VAC Input Voltage
        2. 3.5.1.2 630-VDC Input Voltage
      2. 3.5.2 Without Load
        1. 3.5.2.1 40-VDC Input Voltage
        2. 3.5.2.2 630-VDC Input Voltage

Description

This reference design is an 3-phase input offline high-side buck controller power supply that provides an 12-V output at a maximum of 1 A. The input accepts a voltage range of 43 VAC to 255 VAC per phase. The reference design uses the UCC28C55 low-power current-mode PWM controller.