24V Input, 12V/3.5A Output CCM Flyback


Design files


This reference design uses the UCC2808A to control a 12V/42W flyback operated in continuous conduction mode. The CSD19531Q5A 6-milliOhm, 100V FET enables this design to achieve over 88% efficiency.

Output voltage options PMP2829.1
Vin (Min) (V) 20
Vin (Max) (V) 28
Vout (Nom) (V) 12
Iout (Max) (A) 3.5
Output Power (W) 42
Isolated/Non-Isolated Isolated
Input Type DC
Topology Flyback- CCM^Flyback- Non Sync

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.

SLUUAV3.PDF (1691 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.

N-channel MOSFETs

CSD19531Q5A100-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 6.4 mOhm

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

UCC2808A-1Low power current mode push-pull PWM with discharge transistor, 12.5/8.3V UVLO, -40°C to 85°C

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

Technical documentation

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Type Title Date
Test report PMP2829 Test Results Nov. 19, 2013

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