TIDT259 March   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Considerations
  5. 2Testing and Results
    1. 2.1 Load Regulation
    2. 2.2 Efficiency Graphs
    3. 2.3 Efficiency Data
    4. 2.4 Input Power Limit
    5. 2.5 Thermal Images
  6. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Voltage Ripple
    3. 3.3 Bode Plots
    4. 3.4 Load Transients
    5. 3.5 Start-Up Sequence

Description

This reference design implements a Power over Ethernet (PoE) Powered Device (PD) flyback converter with a 12-V, 3.8-A output. A TPS23730 PD, pulse-width modulator (PWM) controller provides all necessary functions to implement the PoE PD control and PWM control for the flyback converter. The TPS23730 uses primary side regulation (PSR), eliminating the need for optocoupler feedback. An input power-limiting circuit enables the output to be paralleled with a second converter for increased output power capability. This reference design is ideally suited for applications such as wireless access points and security cameras.