Class 4 PoE Flyback Converter (12V@2.125A) Reference Design

(ACTIVE) PMP11254

Description & Features

Technical Documents

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Key Document

Description

The flyback topology with diode rectification provides a low cost solution for Class 4 PoE applications.  The TPS23751 is a combination PoE PD controller and PWM controller, saving cost and space.  This converter is well suited for PoE applications such as security cameras and wireless access points.

Features
  • Ethernet Alliance certified for receiving Class 4 power
  • Isolated non-synchronous flyback-low cost
  • Very good efficiency (88% at max load)
  • Optional VFO mode for improved light load efficiency

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Schematic/Block Diagram

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Design Guide

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Design Files

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Bill of Materials (BOM)

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Parametrics
 PMP11254.1
(Output Voltage 1)
Vin (Min) (V)42.5
Vin (Max) (V)57
Vout (Nom) (V)12
Iout (Max) (A)2.125
Output Power (W)25.5
Isolated/Non-IsolatedIsolated
Input TypeDC
TopologyFlyback- Non Sync
POE

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
TL431A  1% Accuracy Adjustable Precision Shunt Regulator  Voltage references  Sample & Buy Not Available
TPS23751  IEEE 802.3at PoE Interface With Flyback DC-DC Controller  Power over Ethernet (PoE)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
TL431A Download Download
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Download -
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TPS23751 Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 1220 09 May 2016 25
Design files (3)
Title Abstract Type Size (KB) Date Views
ZIP 424 09 May 2016 14
PDF 117 09 May 2016 19
PDF 497 09 May 2016 59

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