Class 1 Mulitple Output High Efficiency Flyback Converter for PoE Applications Reference Design
PMP8752
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Description & Features

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Description

This converter is used for Class 1 PoE applications where high-efficiency and multiple-outputs are required. The multi-outputs for this design are 3.3V/0.7A, 5V/0.145A, 3.3V/1.5A. The flyback converter with synchronous rectifier provides excellent efficiency, and small size for PoE applications, such as an IP phone solution.

The TPS23785B contains both the PoE powered device and the PWM controller functions.

Features
  • Multiple outputs for 3.3V/0.7A, 5V/0.145A, 3.3V/1.5A
  • High efficiency (89%)
  • Isolated flyback with synchronous rectifier
  • Small solution size
  • Uses TPS23785 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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Parametrics
 PMP8752.1
(Output Voltage 1)
PMP8752.2
(Output Voltage 2)
Vin (Min) (V)3636
Vin (Max) (V)5757
Vout (Nom) (V)3.35
Iout (Max) (A).7.15
Output Power (W)2.31.75
Isolated/Non-IsolatedIsolatedIsolated
Input TypeDCDC
TopologyFlyback- Synchronous
POE
Flyback- Synchronous
POE

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
CSD17507Q5A  30V N-Channel High Side NexFET Power MOSFET with 20 Volt Vgs  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
TL431  Adjustable precision shunt regulator  Voltage references  Sample & Buy Not Available
TLV431A  1% Accuracy Low-Voltage Adjustable Precision Shunt Regulator  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
TPS23785B  High-Power, High-Efficiency PoE PD and DC-to-DC Controller  Power over Ethernet (PoE)  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD17507Q5A VSONP (DQJ)| 8 Download Download
TL431 Download Download
Download Download
Download -
Download Download
Download Download
Download Download
Download Download
Download -
Download Download
TLV431A Download Download
Download Download
Download -
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Download -
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TPS23785B Download

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Technical Documents

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

User guides (1)
Title Type Size (KB) Date
PDF 445 01 Feb 2013
Design files (3)
Title Type Size (KB) Date
ZIP 314 19 May 2014
PDF 140 16 Sep 2013
PDF 51 01 Feb 2013

Support & training

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