AC input, 5-V/2-A and 12-V/2.5-A dual-output flyback converter reference design


Design files


This reference design is a 40-W dual-output offline converter using UCC28742, a secondary side regulator. A 5-V rail is regulated to within ±1% precision and cross regulation of 12-V rail is within -8%~+14% at 25% to 100% load. The design adopts a single-layer PCB for cost optimization. The peak efficiency is 82.68% at 115 V/60 Hz and 84.03% at 230 V/50 Hz. Power consumption at standby mode is 32.7 mW at 115 V/60 Hz and 57.51 mW at 230 V/50 Hz.

  • Single-layer PCB design for cost optimization
  • High precision of 5-V output rail
  • Peak efficiency 82.68% at 115 V/60 Hz and 84.03% at 230 V/50 Hz
  • Low standby power consumption
Output voltage options PMP40508.1 PMP40508.2
Vin (Min) (V) 85 85
Vin (Max) (V) 265 265
Vout (Nom) (V) 5 12
Iout (Max) (A) 2 2.5
Output Power (W) 10 30
Isolated/Non-Isolated Isolated Isolated
Input Type AC AC
Topology Flyback- DCM Flyback- DCM
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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.

TIDT107.PDF (2122 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


Detailed overview of design layout for component placement


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

TIDCFG4.ZIP (1783 K)

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


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)

UCC28742High-Efficiency Flyback Controller with 1% Output regulation accuracy

Data sheet: PDF | HTML
Shunt voltage references

TL431LIAdjustable precision shunt regulator with optimized reference current (pin layout: KRA)

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report AC Input, 5-V/2-A and 12-V/2.5-A Dual-Output Flyback Converter Reference Design May 07, 2019

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