Class 4, Efficiency-Optimized, Flyback Converter Reference Design for PoE Applications


Design files


This reference evaluation module, featuring the TPS23754 PoE interface and DC-to-DC controller, is used for Class 4 PoE applications where high efficiency is required. Output power is 5V at 5A from either an adapter input(21.6-57VDC) or power over ethernet. in general, the efficiency gain is on the order of 3-4%.

  • High efficiency(90%), converter only efficieny is 92%
  • 5V at 5A output
  • Isolated Flyback with synchornous rectifier
  • Uses TPS23754 hig-power,high-efficiency PoE interface PD and PWM controller
  • Capable of accepting power from AUX sources such as adapters
  • This circuit design is full-functional tested and recommended for new designs

Output voltage options PMP6672.1
Vin (Min) (V) 21.6
Vin (Max) (V) 57
Vout (Nom) (V) 5
Iout (Max) (A) 5
Output Power (W) 25
Isolated/Non-Isolated Isolated
Input Type DC
Topology Flyback- Synchronous^POE
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

SLUA670.PDF (701 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

SLUUA87.PDF (603 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

SLURA05.PDF (128 K)

Detailed schematic diagram for design layout and components

SLURA06.PDF (126 K)

Complete listing of design components, reference designators, and manufacturers/part numbers


Includes TI products in the design and potential alternatives.

Powered devices

TPS23754IEEE 802.3at, high efficiency, PoE interface and DC/DC controller

Data sheet: PDF | HTML
Shunt voltage references

TLV431A1% accuracy, low-voltage, adjustable precision shunt regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Technical article Flyback converters: two outputs are better than one PDF | HTML Nov. 24, 2016
Test report PMP6672 Test Results Sep. 16, 2013
Test report PMP6672 Reference Guide Sep. 16, 2013

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