Class 3 Isolated Fly-Buck Power Module for PoE Application Reference Design


Design files


The PMP10572 reference design is an single output isolated Fly-Buck power supply for PoE application. It takes 48V nominal input and provides 12V 1A output. The board is designed with TPS2378(PD controller) to provide 40V-57V input votlage and 12V 1SA output power. The design features the LM5160A synchronous buck converter configured as a Fly-Buck regulator. With the benefit of primary side regulation, the supply has the outputs regulated without the opto-coupler or additional transformer winding. The LM5160A has a wide Vin range of 4.5V to 65V and 1.5A output current capability with integrated switch FETs. The input voltage to the reference board can be loosely regulated with a range of 40V to 57V.

  • Single 12V 1A output
  • Fly-Buck converter design, primary side regulation, compact solution with TPS2378
  • Wide input voltage range  of 40V to 57V
  • Provide 12W supply power , 85% peak efficiency.
  • LM5160A sync buck regulator, up to 65V wide Vin range, 1.5A capability
  • This circuit board is tested, and the design files and test report are included.
Output voltage options PMP10572.1
Vin (Min) (V) 40
Vin (Max) (V) 57
Vout (Nom) (V) 12
Iout (Max) (A) 1
Output Power (W) 12
Isolated/Non-Isolated Isolated
Input Type DC
Topology FlyBuck^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.

TIDU779.PDF (1093 K)

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

TIDC909.ZIP (50 K)

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


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC converters (integrated FET)

LM5160ALM5160A Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter

Data sheet: PDF | HTML
Powered devices

TPS2378IEEE 802.3at PoE High-Power PD interface with AUX Control

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Technical article Power over Ethernet: New applications every day PDF | HTML Oct. 14, 2015
Test report PMP10572 Test Results Feb. 12, 2015

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