85-265VAC Input, 54V/30W Power Over Ethernet PSE Reference Design


Design files


This reference design provides a universal AC input, 30W PSE solution for Power Over Ethernet.  The UCC28700 uses primary side regulation to create an isolated 54V rail at low cost.  The TPS23861 injects the 54V rail onto the ethernet cable.

  • Single port PSE solution for power over ethernet
  • Over 90% efficiency at full load, low standby power
  • Primary side regulation reduces cost
  • 1oz, 2-layer board measuring 90mm x 50mm size
Output voltage options PMP20199.1
Vin (Min) (V) 90
Vin (Max) (V) 265
Vout (Nom) (V) 54
Iout (Max) (A) .56
Output Power (W) 30.24
Isolated/Non-Isolated Isolated
Input Type AC
Topology Flyback- Quasi Resonant
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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.

TIDUDR7.PDF (3082 K)

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

TIDRT83.PDF (190 K)

Detailed schematic diagram for design layout and components

TIDRT84.PDF (38 K)

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

TIDRT85.PDF (96 K)

Detailed overview of design layout for component placement

TIDRT86.PDF (641 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC28700Constant-voltage, constant-current PWM with PSR & Programmable cable compensation

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS71550-mA 24-V ultra-low-IQ low-dropout (LDO) voltage regulator

Data sheet: PDF | HTML
Power sourcing equipment

TPS238612-pair, type-2, 4-channel PoE PSE with autonomous mode

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP20199 Test Results Oct. 24, 2017

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