Class 3 5V/2.3A High Efficiency Synchronous Flyback Converter for PoE Application Reference Design
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This converter is used for Class 3 PoE applications where high efficiency and isolation are required. The specific output for this design is 5V@2.3A. The flyback converter with synchronous rectifier provides excellent efficiency and small size for PoE applications such as a IP Phones. The TPS23753APW contains both the PoE Powered Device and the PWM controller functions

  • Ethernet Alliance certified for receiving Class 3 power
  • High efficiency for both PoE supply power and adapter supply power (up to more than 90%)
  • The output is 5V/2.3A
  • Isolated Flyback with synchornous rectifier
  • Small size solution
  • Uses TPS23753APW with PoE interface PD and PWM controller
  • This circuit design is full-functional tested and recommended for new designs

See the Important Notice and Disclaimer covering reference designs and other TI resources.


Schematic/Block Diagram

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Test Data

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Design Files

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(Output Voltage 1)
Vin (Min) (V)36
Vin (Max) (V)57
Vout (Nom) (V)5
Iout (Max) (A)2.3
Output Power (W)11.5
Input TypeDC
TopologyFlyback- Synchronous

TI Devices (4)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD17527Q5A  30V, N-Channel NexFET™ Power MOSFETs  MOSFETs  Sample & Buy Not Available
CSD17551Q3A  30V N-Channel MOSFET  MOSFETs  Sample & Buy Not Available
TLV431A  1% accuracy, low-voltage, adjustable precision shunt regulator  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
TPS23753A  IEEE 802.3-2005 PoE interface and Isolated Converter controller with Enhanced ESD Ride-Through  Power over Ethernet (PoE) ICs  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD17527Q5A VSONP (DQJ)| 8 Download Download
CSD17551Q3A VSONP (DNH)| 8 Download Download
TLV431A Download Download
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TPS23753A Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 603 14 May 2014
Design files (4)
Title Type Size (KB) Date
ZIP 489 14 May 2014
PDF 224 14 May 2014
PDF 137 14 May 2014
PDF 254 14 May 2014

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