Class 4 12V/2.5A Active Clamp Forward Converter for PoE PD Application Reference Design


Design files


This 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. CSD19534Q5A 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 12VDC at 1.9A with PoE input or 12VDC at 2.5A with auxiliary input.


Integrated PD and PWM controller
Power conversion efficiency of 92% at full load
Low gate charge MOSFETs for high efficiency synchronous rectification
Auxiliary power input available
Test report includes efficiency, Vout ripple, load step, turn on response, loop stability

Output voltage options PMP9563.1
Vin (Min) (V) 36
Vin (Max) (V) 57
Vout (Nom) (V) 12
Iout (Max) (A) 2.5
Output Power (W) 30
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.

TIDU611.PDF (476 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

TIDC727.ZIP (259 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

CSD19534Q5A100-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 15.1 mOhm

Data sheet: PDF | HTML
Powered devices

TPS23754IEEE 802.3at, high efficiency, PoE interface and 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 PMP9563 Test Results Oct. 21, 2014

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