Class 5 PoE PD (12 V/2.5 A) supply reference design with smooth transition to auxiliary PMP21103 (ACTIVE)

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Key Document

Description

This reference design implements an IEEE802.3bt compliant Class 5 Power over Ethernet (PoE) Powered Device (PD) with smooth transition between the PoE input and an auxiliary supply connected to the output.  The design consists of a 12-V/2.5-A active clamp forward converter utilizing the UCC2897A controller and allows one PoE Power Source Equipment (PSE) supply and one AC/DC wall adapter auxiliary supply to be used in order to decrease the probability of power and data loss in your system.  An IEEE802.3bt compliant TPS2373-4 high power PD controller is utilized to control all PoE functions.

Features
  • Smooth transition when switching between PoE input and 12-V adapter on output
  • 89% efficiency with 12-V/2.5-A output and PoE input (FET OR-ing)
  • Diode OR-ing option for lower cost

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Schematic/Block Diagram

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Design Guide

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Design Files

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Parametrics
 PMP21103.1
(Output Voltage 1)
Vin (Min) (V)42.5
Vin (Max) (V)57
Vout (Nom) (V)12
Iout (Max) (A)2.5
Output Power (W)30
Isolated/Non-IsolatedIsolated
Input TypeDC
TopologyForward- Active Clamp
POE

TI Devices (7)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD18534Q5A  60V N-Channel NexFET Power™ MOSFET  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
CSD19538Q2  100V, 49mOhm SON2x2 NexFET Power MOSFET  MOSFETs  Sample & Buy Not Available
CSD25402Q3A  P-Channel NexFET Power MOSFET  MOSFETs  Sample & Buy Not Available
TL431  Adjustable precision shunt regulator  Voltage references  Sample & Buy Not Available
TPS2373  IEEE 802.3bt PoE high-power PD interface with advanced startup  Power over Ethernet (PoE)  Sample & Buy View Design Kits & Evaluation Modules
TPS3803  Low Power Voltage Detector  Power management  Sample & Buy Not Available
UCC2897A  Advanced Current-Mode Active Clamp PWM Controller  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD18534Q5A VSONP (DQJ)| 8 Download
CSD19538Q2 WSON (DQK)| 6 Download Download
CSD25402Q3A VSONP (DNH)| 8 Download
TL431 Download Download
Download Download
Download -
Download Download
Download Download
Download Download
Download Download
Download -
Download Download
TPS2373 Download Download
TPS3803 Download -
UCC2897A Download Download
Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 2822 25 Jan 2019
Design files (6)
Title Type Size (KB) Date
ZIP 1637 25 Jan 2019
ZIP 4238 25 Jan 2019
PDF 1647 25 Jan 2019
PDF 310 25 Jan 2019
PDF 104 25 Jan 2019
PDF 344 25 Jan 2019

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