Class 3 Dual Output Isolated Flyback Converter for PoE Applications Reference Design


Design files


This converter is used for Class 3 PoE applications that require 3.3V/1A and 5V/1A outputs. The dual output flyback converter with synchronous rectifiers provides excellent efficiency and small size for PoE applications, such as an IP phone.  The TPS23753A contains both the PoE powered device and the PWM controller functions.

  • Dual outputs of 3.3V/1A and 5V/1A
  • High efficiency (87.9%) at max load
  • 1500Vrms isolation
  • TPS23753A contains both PD and PWM controllers
Output voltage options PMP11107.1 PMP11107.2
Vin (Min) (V) 36 36
Vin (Max) (V) 57 57
Vout (Nom) (V) 3.3 5
Iout (Max) (A) 1 1
Output Power (W) 3.3 5
Isolated/Non-Isolated Isolated Isolated
Input Type DC DC
Topology Flyback- Synchronous^POE Flyback- Synchronous^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.


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

TIDCC58.ZIP (339 K)

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


Includes TI products in the design and potential alternatives.

Powered devices

TPS23753AIEEE 802.3-2005 PoE interface and Isolated Converter controller with Enhanced ESD Ride-Through

Data sheet: PDF | HTML
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 PMP11107 Test Results May 09, 2016
Technical article Flyback converters: two outputs are better than one PDF | HTML Nov. 24, 2016

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