85-265Vin, 5Vout, 1Aout, AC-DC Fly-Buck Converter Reference Design


Design files


The PMP10834RevA reference design is a compact and thermally efficient design intended to step down a wide range of AC inputs (85VAC to 265VAC). This non-isolated Flybuck design incorporates the UCC28C42 PWM with an optocoupler feedback to provide 1% output voltage regulation. All the circuit components (including magnetics) are standard parts.

  • Non-isolated AC-DC 5V/1A Flybuck converter.
  • Less than 45 degree C temperature rise on all parts.
  • 1% output voltage regulation accuracy.
  • Utilize all standard components (including magnetics).
  • Compact board size with 1.4" W x 2.7" L.
  • Test report available.
Output voltage options PMP10834.1
Vin (Min) (V) 85
Vin (Max) (V) 265
Vout (Nom) (V) 5
Iout (Max) (A) 1
Output Power (W) 5
Isolated/Non-Isolated Isolated
Input Type AC
Topology Flybuck

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.

TIDUAB6.PDF (1251 K)

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

TIDRG37.PDF (263 K)

Detailed schematic diagram for design layout and components

TIDRG38.PDF (131 K)

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

TIDRG39.PDF (99 K)

Detailed overview of design layout for component placement

TIDRG40.ZIP (1285 K)

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


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


Includes TI products in the design and potential alternatives.

PWM controllers

UCC28C4220V, 1-A, BiCMOS Low current 8 pin PWM current mode controller

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

UCC28C4520V, 1-A, low power 1MHz current mode PWM controller - 8.4V/7.6V UVLO 50% duty cycle, -40C to 105C

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

UCC38C4320V, 1-A, Low current 1MHz current mode PWM controller with 8.4V/7.6V UVLO 100% duty cycle 0C to 70C

Data sheet document-pdfAcrobat PDF open-in-new HTML
Shunt voltage references

TL431Adjustable precision shunt regulator

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

Technical documentation

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Type Title Date
* Test report PMP10834 Test Results Jul. 16, 2015

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