Class 4 PoE PD (24-V/0.9-A) power supply reference design


Design files


This reference design utilizes a flyback converter to implement a Class 4 Power over Ethernet (PoE) poweredDevice dPD) with a 24-V/0.9-A output. The TPS23754
is a combination PD/PWM controller in one package, saving cost and space. This reference design is suited for many PoE applications such as wireless access points, audio, signage and IP cameras.

  • PoE input
  • 24-Vdc or 48-Vdc adapter input
  • Peak efficiency of 88% (91% for converter)
  • Diode rectification to minimize cost
Output voltage options PMP22301.1
Vin (Min) (V) 18
Vin (Max) (V) 57
Vout (Nom) (V) 24
Iout (Max) (A) 1
Output Power (W) 24
Isolated/Non-Isolated Isolated
Input Type DC
Topology POE
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.

TIDT186.PDF (3520 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDM605.PDF (247 K)

Detailed schematic diagram for design layout and components

TIDM606.PDF (331 K)

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

TIDM607.PDF (201 K)

Detailed overview of design layout for component placement

TIDM609.ZIP (1044 K)

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

TIDCFV2.ZIP (1544 K)

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

TIDM608.PDF (1017 K)

PCB layer plot file used for generating PCB design layout


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
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
* Test report Class 4 PoE PD (24-V/0.9-A) Power Supply Reference Design May 27, 2020

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