Class 3 - Mulitple Output, High Efficiency Self-Driven Flyback Converter for PoE Applications


Design files


This converter is used for Class 3 PoE applications where high efficiency and multiple outputs are required. PMP8454.1 has an output of 3.3V@2A. The flyback converter with synchronous rectifier provides excellent efficiency and small size for PoE applications such as a IP Phones. The TPS23785B contains both the PoE Powered Device and the PWM controller functions.

Output voltage options PMP8454.1 PMP8454.2
Vin (Min) (V) 36 36
Vin (Max) (V) 57 57
Vout (Nom) (V) 3.3 5
Iout (Max) (A) 2 1
Output Power (W) 6.6 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.

SLUUA98.PDF (680 K)

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

SLURA11.PDF (44 K)

Detailed schematic diagram for design layout and components

SLURA12.PDF (21 K)

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

SLUC422.ZIP (320 K)

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

SLUUA99.PDF (249 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

N-channel MOSFETs

CSD17527Q5A30-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 10.8 mOhm

Data sheet: PDF
Powered devices

TPS23785BHigh-Power, High-Efficiency PoE PD and DC-to-DC Controller

Data sheet: PDF
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 PMP8454 Test Results Feb. 01, 2013

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