Type 3 IEEE802.3bt-ready active clamp forward converter PoE powered device reference design


Design files


This TI reference design showcases a Type-3, Class 6, 51-W active clamp forward converter for powered devices (PD) through PoE. The TPS23730 PD controller provides detection and classification while also containing a PWM controller. This design takes in a 37-V to 57-V PoE input, and outputs a 5-V rail for applications such as IP network cameras and wireless access points. 

  • IEEE802.3bt Type 3 compliant PoE PD
  • Integrated PWM controller for flyback or active clamp forward congifuration
  • Frequency dithering for EMI reduction
  • Soft-start control with advanced startup and hiccup mode overload protection
  • Automatic maintain power signature (MPS)
  • Soft-stop shutdown
Communications equipment
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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.

TIDUEX8.PDF (7810 K)

Reference design overview and verified performance test data

TIDM699.PDF (443 K)

Detailed schematic diagram for design layout and components

TIDM700.PDF (144 K)

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

TIDM701.PDF (455 K)

Detailed overview of design layout for component placement

TIDM703.ZIP (5018 K)

Files used for 3D models or 2D drawings of IC components


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

TIDM702.PDF (1681 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Powered devices

TPS23730IEEE 802.3bt type-3 class 1-6 PoE 2 PD with high efficiency DC-DC controller

Data sheet: PDF | HTML

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

Data sheet: PDF | HTML

CSD19538Q2100-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 59 mOhm

Data sheet: PDF | HTML
Shunt voltage references

TLV4311.5% accuracy, low-voltage, adjustable precision shunt regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Type 3 IEEE802.3bt-ready Active Clamp Forward Converter PoE Powered Device Refe PDF | HTML Sep. 21, 2020

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