6-W dual-output SEPIC converter reference design


Design files


This reference design employs LM5155 Boost/Flyback/SEPIC controller to provide 6-W outputs with dual-output SEPIC topology. The input is 12-VDC, and outputs are ±60 V/50 mA. The switching frequency is set at 500k Hz. This design achieves 88.2% peak efficiency. The cross regulation of -60-V rail is within ±4% at the total load range. External voltage control pin is optional to regulate output voltage from 0~60 V. The high efficiency and small PCB dimensions (25mm*14mm*4.5mm) make the design suitable for portable ultrasound probe application.

  • Outputs ±60-V/50-mA symmetrically with programmable option from 0 to 60 V by external control signal
  • 88.2% peak efficiency
  • Cross regulation within ±4% of -60-V rail
  • 500k-Hz switching frequency for small PCB dimension
Output voltage options PMP40488.1 PMP40488.2
Vin (Min) (V) 9 9
Vin (Max) (V) 12 12
Vout (Nom) (V) 60 -60
Iout (Max) (A) .05 -.05
Output Power (W) 3 3
Isolated/Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC
Topology Sepic- CCM Sepic- CCM

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.

TIDT071B.PDF (1790 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

TIDCF75.ZIP (451 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.

Boost controllers (external switch)

LM51552.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller

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

Technical documentation

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Type Title Date
* Test report 6-W Dual-Output SEPIC Converter Reference Design (Rev. B) Apr. 21, 2020

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