Non-Standard (>25.5W) PoE - High Efficiency Forward Converter (12V@5A) Reference Design


Design files


This converter provides a high power PoE output of 12V/5A. The TPS2379 PD controller allows the use of an external hot swap FET for increased efficiency. The UCC2897A PWM controller is used to implement a high efficiency active clamp forward converter.

  • High efficiency (90% with PoE supply, 93.6% with adapter supply)
  • 12V at 5A output
  • Isolated Forward with synchornous rectifier
  • Uses TPS2379 combined with UCC2897A to implement a high efficiency active forward converter
  • Allows an external hot swap FET for increased efficiency
  • This circuit design is full-functional tested and recommended for new designs
Output voltage options PMP7499.1
Vin (Min) (V) 42
Vin (Max) (V) 57
Vout (Nom) (V) 12
Iout (Max) (A) 5
Output Power (W) 60
Isolated/Non-Isolated Isolated
Input Type DC
Topology Forward- Active Clamp^POE
?? View video with transcript Video

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.

SLVU900.PDF (550 K)

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

SLVRB55.PDF (59 K)

Detailed schematic diagram for design layout and components

SLVRB56.PDF (141 K)

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

TIDC431.ZIP (344 K)

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

SLVU901.PDF (202 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

N-channel MOSFETs

CSD18533Q5A60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 5.9 mOhm

Data sheet: PDF | HTML
PWM controllers

UCC2897A110-V active clamp current mode PWM controller with P-channel clamp FET and line OV protection

Data sheet: PDF | HTML
Powered devices

TPS2379IEEE 802.3at PoE High-Power PD interface with external gate driver

Data sheet: PDF | HTML
Shunt voltage references

TL431Adjustable precision shunt regulator

Data sheet: PDF | HTML

Technical documentation

No results found. Please clear your search and try again.
View all 2
Type Title Date
Technical article Power over Ethernet: New applications every day PDF | HTML Oct. 14, 2015
Test report PMP7499 Test Results Mar. 21, 2013

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​