Type-3 IEEE802.3bt-ready flyback converter PoE powered device reference design


Design files


This design showcases a low cost, Type-3, Class 6, 51W flyback converter for powered devices through Power over Ethernet. The TPS2373-3 PD controller provides detection and classification while also powering up the LM51551-Q1 PWM controller through its advanced startup feature. This design takes in a 42V-57V PoE input and outputs a 12V rail for applications such as IP network cameras and wireless access points.

In need of an IEEE802.3bt-ready PSE controller? Check out the TPS23881.

  • Supports power levels for IEEE802.3bt Type 3
  • Isolated diode rectified flyback design
  • Built in hiccup mode protection for superior thermal performance during faults
  • PD Advanced Startup for PWM controller
  • Automatic Maintain Power Signature (MPS)
  • Oring circuit for auxiliary power through AC/DC
Output voltage options TIDA-050023.1
Vin (Min) (V) 42
Vin (Max) (V) 57
Vout (Nom) (V) 12
Iout (Max) (A) 4.25
Output Power (W) 51
Isolated/Non-Isolated Isolated
Input Type DC
Topology Flyback- Non Sync
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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.

TIDUEL2.PDF (15666 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRXW8.ZIP (2327 K)

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

TIDCF24.ZIP (713 K)

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

TIDRXX0.PDF (1558 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Powered devices

TPS2373IEEE 802.3bt PoE high-power PD interface with advanced startup

Data sheet: PDF | HTML
Boost controllers (external switch)

LM51552.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller

Data sheet: PDF | HTML
Shunt voltage references

TL431LIAdjustable precision shunt regulator with optimized reference current (pin layout: KRA)

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Type 3 IEEE802.3bt-ready Flyback Converter PoE PD Reference Design Oct. 18, 2018

Related design resources

Hardware development

TPS2373-4EVM-758 TPS2373-4 evaluation module for IEEE802.3bt PoE PD applications

Reference designs

TIDA-00741 Non-Standard PoE, UPOE High-Efficiency Flyback Converter Reference Design for PoE PD Applications

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