Primary-Side Regulated Flyback for Universal 3-phase AC Input w/Bipolar Transistor Reference Design


Design files


The PMP9044 reference design uses the UCC28720 primary-side regulated flyback controller to generate a 3.3V/0.5A output from a 3-phase univeral AC input. A bipolar transistor is used as the switch on the primary side to minimize the circuit cost.

Output voltage options PMP9044.1
Vin (Min) (V) 90
Vin (Max) (V) 265
Vout (Nom) (V) 3.3
Iout (Max) (A) .5
Output Power (W) 1.65
Isolated/Non-Isolated Isolated
Input Type AC
Topology Flyback- DCM

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.

SLUUAQ4.PDF (1564 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

SLUC489.ZIP (180 K)

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


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC28720Constant-voltage, constant-current controller with primary-side regulation for bipolar power devices

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

Technical documentation

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Type Title Date
Technical article Power Tips: when to use a BJT power switch Oct. 15, 2013
Test report PMP9044 Test Results Sep. 10, 2013

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