Class 4 PoE High Efficiency Active Clamp Forward Converter (3.3V) Reference Design


Design files


The PMP10288 reference design is a Power Over Ethernet (POE) active clamp forward converter. It features the TPS23754, which is a combination of a POE Powered Device (PD) controller and PWM controller. CSD17501Q5A FETs are used for high efficiency synchronous rectification. The input accepts standard Type 2 POE voltage of 42.5VDC-57VDC or a 36VDC-57VDC auxiliary voltage. The output power is an isolated 3.3VDC at 6.9A with PoE input or 3.3VDC at 7.2A with auxiliary input.

  • Integrated PD and PWM controller
  • Power Conversion Efficiency of 90% at full load
  • Low gate charge MOSFETs for high efficiency synchronous rectification
  • Auxillary power input available
  • Test report includes efficiency, ripple, load step, turn-on response, loop stability, and thermal plot
Output voltage options PMP10288.1
Vin (Min) (V) 36
Vin (Max) (V) 57
Vout (Nom) (V) 3.3
Iout (Max) (A) 7.2
Output Power (W) 23.76
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.

TIDUA68.PDF (1001 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


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


Includes TI products in the design and potential alternatives.

Powered devices

TPS23754IEEE 802.3at, high efficiency, PoE interface and DC/DC controller

Data sheet: PDF | HTML
N-channel MOSFETs

CSD17501Q5A30-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 2.9 mOhm

Data sheet: PDF
Shunt voltage references

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

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP10288 Test Results Jun. 23, 2015
Technical article Power over Ethernet: New applications every day PDF | HTML Oct. 14, 2015
Technical article Power Tips: Voltage mode or current mode? PDF | HTML Oct. 02, 2015

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