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


Design files


The flyback topology with diode rectification provides a low-cost solution for Class 4 PoE applications. The TPS23751 is a combination Power over Ethernet (PoE) powered device (PD) controller and PWM controller which saves cost and board space. This converter is well suited for PoE applications such as security cameras and wireless access points.

  • Ethernet Alliance certified for receiving Class 4 power
  • Isolated nonsynchronous flyback
  • Very good efficiency (88% at max load)
  • Optional VFO mode for improved light load efficiency
Output voltage options PMP11254.1
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-Isolated Isolated
Input Type DC
Topology Flyback- Non Sync^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.

TIDUBT4.PDF (1288 K)

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


Detailed schematic diagram for design layout and components


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

TIDCC59.ZIP (424 K)

Design file that contains information on physical board layer of design PCB


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
Shunt voltage references

TL431Adjustable precision shunt regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP11254 Test Results May 09, 2016

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