450W High Efficiency 25V Buck Converter Reference Design


Design files


PMP20808 is a single-phase synchronous cuck converter reference design using the LM5117 controller IC. The design accepts an input voltage of 36Vin to 40Vin (38Vin Nominal) and provides an output of 25Vout capable of supplying 18A of continuous current to the load. The design was built on the PMP9280 PCB, which was modified to the PMP20808 design configuration and requirements. The PCB is a 4-layer board with 1oz copper on all layers.

  • Very high efficiency and high power
  • Small solution size for its voltage and power
  • Only single-phase operation
  • Optional current monitor output
Output voltage options PMP20808.1
Vin (Min) (V) 36
Vin (Max) (V) 40
Vout (Nom) (V) 25
Iout (Max) (A) 18
Output Power (W) 450
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Synchronous

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.

TIDUE01.PDF (679 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


Detailed overview of design layout for component placement


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

TIDCE78.ZIP (397 K)

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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck controllers (external switch)

LM51175.5-65V Wide Vin, Current Mode Synchronous Buck Controller with Analog Current Monitor

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Test report PMP20808 Test Results Dec. 11, 2017

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