Class 3,Cost and Efficiency Optimized Buck Converter for PoE Applications Reference Design


Design files


This reference evaluation module, featuring the TPS23750 PoE DC-to-DC controller, is used for class 3 PoE applications where low-cost and high efficiency are required.

The module accepts input voltages between 37-57V ac and output 12V at 0.95A.

  • Nonisolated upside-down buck
  • 12V at 0.95 A output
  • Low cost design with high efficiency (88%)
  • Uses TPS23750 IEEE802.3af PD controller with integrated DC/DC controller
  • Small board size
  • This circuit design is fully functional, tested and recommended for new designs.
Output voltage options PMP4679.1
Vin (Min) (V) 37
Vin (Max) (V) 57
Vout (Nom) (V) 12
Iout (Max) (A) .95
Output Power (W) 11.4
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Upside Down^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.

SLVU614.PDF (474 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


Includes TI products in the design and potential alternatives.

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Technical documentation

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Type Title Date
Test report PMP4679 Test Results Sep. 16, 2013

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