Class 4 High-Efficiency Driven Flyback Converter (5V/5A) for PoE PD Applications Reference Design


Design files


The TIDA-00617 reference design uses the TPS23751 PoE PD controller in a high effciency (driven) synch flyback converter capable of 5V at 5A.

  • Ethernet Alliance certified for receiving Class 4 power
  • IEEE802.3.at compliant
  • 93% high efficiency (converter only)
  • Test Report is Included
Output voltage options TIDA-00617.1
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.

TIDUA99.PDF (1070 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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

TIDRFZ8.PDF (2617 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Powered devices

TPS23751IEEE 802.3at PoE interface with flyback DC-DC controller

Data sheet: PDF | HTML
N-channel MOSFETs

CSD18504Q5A40-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 6.6 mOhm

Data sheet: PDF | HTML
Shunt voltage references

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

Data sheet: PDF | HTML

Technical documentation

= Top documentation selected by TI
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Type Title Date
* Design guide TIDA-00617 Test Results Jul. 07, 2015
Technical article Maximizing PoE PD efficiency on a budget PDF | HTML Nov. 10, 2015
Technical article Power over Ethernet: New applications every day PDF | HTML Oct. 14, 2015

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