Four-output, SEPIC converter-bias power supply reference design for solar panel applications


Design files


This reference design supplies two non-isolated and two isolated output voltages. It references a regulated 3.3-V/0.25-A and an unregulated 12-V/0.05-A output on the primary-side, and it isolates two 12-V/0.025-A unregulated outputs.  The design operates over an input voltage range of 7 V to 45 V and offers minimal voltage ringing on the FET for lower stress and reduced EMI.

  • SEPIC topology eliminates FET voltage ringing for reduced stress and lower EMI
  • Four-output single-ended primary-inductor converter (SEPIC) from single transformer provides excellent cross regulation
  • Full load efficiency greater than 80% from 12-V and 24-V input
  • Compact size (30 mm x 40 mm) minimizes required PCB area
Output voltage options PMP21883.1 PMP21883.2 PMP21883.3 PMP21883.4
Vin (Min) (V) 7 7 7 7
Vin (Max) (V) 45 45 45 45
Vout (Nom) (V) 3.3 12 12 12
Iout (Max) (A) .25 .05 .025 .025
Output Power (W) .825 .6 .3 .3
Isolated/Non-Isolated Non-Isolated Non-Isolated Isolated Isolated
Input Type DC DC DC DC
Topology Sepic- CCM Sepic- CCM 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.

TIDT141.PDF (3234 K)

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

TIDM239.PDF (134 K)

Detailed schematic diagram for design layout and components

TIDM240.PDF (97 K)

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

TIDM241.PDF (99 K)

Detailed overview of design layout for component placement

TIDM243.ZIP (32183 K)

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


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

TIDM242.PDF (617 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Boost controllers (external switch)

LM5155-Q12.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller, AEC-Q100 qualified

Data sheet document-pdfAcrobat PDF open-in-new HTML
N-channel MOSFETs

CSD19538Q2100-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 59 mOhm

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

Technical documentation

= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 1
Type Title Date
* Test report Four-Output, SEPIC-Converter-Bias Power Supply Reference Design Oct. 08, 2019

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​