Non-Standard PoE (>25.5W) - High Efficiency Forward Converter (5V@10A) Reference Design


Design files


This converter provides a high power PoE output of 5V/10A. 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 (93% with PoE supply, 92% with adapter supply)

• 5V at 10A output

• Isolated Forward with synchronous rectifier

• Uses TPS2379 combined with UCC2897A to implement a high efficiency active forward converter

• Allows an external hot swap FET for increased efficiency

Output voltage options PMP8923.1
Vin (Min) (V) 42
Vin (Max) (V) 57
Vout (Nom) (V) 5
Iout (Max) (A) 10
Output Power (W) 50
Isolated/Non-Isolated Isolated
Input Type DC
Topology Forward- Active Clamp^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.

TIDU874.PDF (721 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

TIDCA08.ZIP (251 K)

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


Includes TI products in the design and potential alternatives.

N-channel MOSFETs

CSD18503Q5A40-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 4.3 mOhm

Data sheet: PDF | HTML
PWM controllers

UCC2897Current Mode Active Clamp PWM Controller

Data sheet: PDF
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

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Type Title Date
Test report PMP8923 Test Results Mar. 27, 2015

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