16-W SiC PSR flyback reference design


Design files


This reference design converts a wide 85-Vac to 480-Vac input to a pair or reinforced, isolated 12-V and 24-V outputs. The 12-V output is capable of 14-W loading, and the 24-V output is capable of 2.4-W loading. This reference design uses UCC28730 as a PSR valley-switching flyback design. A Silicon-Carbide (SiC) low-side FET is used to achieve high efficiencies while operating across a wide input range. A balancing cap on the secondary side keeps the two outputs in close regulation regardless of loading conditions.

  • SiC FET achieves high efficiency across wide-input voltage range
  • Cancellation winding in transformer design eliminates need for additional common-mode choke
  • Compact 3.725” x 1.8” PCB size with a maximum component height of 1.1”
Output voltage options PMP22529.1 PMP22529.2
Vin (Min) (V) 90 90
Vin (Max) (V) 480 480
Vout (Nom) (V) 24 12
Iout (Max) (A) .1 1.167
Output Power (W) 2.4 14.004
Isolated/Non-Isolated Isolated Isolated
Input Type AC AC
Topology Flyback- Quasi Resonant Flyback- Quasi Resonant
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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.

TIDT012.PDF (908 K)

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

TIDMA23.PDF (237 K)

Detailed schematic diagram for design layout and components

TIDMA24.PDF (390 K)

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

TIDMA25.PDF (191 K)

Detailed overview of design layout for component placement

TIDMA27.ZIP (890 K)

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

TIDCG43.ZIP (460 K)

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

TIDMA26.PDF (533 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC controllers (external FET)

UCC28730Zero standby PSR flyback controller with CVCC and wake-up monitoring

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report 16-W SiC FET PSR Flyback Reference Design PDF | HTML Feb. 09, 2022

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