Universal AC Input, Dual Output (12V@30mA, 3.3V@400mA) Isolated Flyback Converter Reference Design


Design files


The PMP10143 reference design demonstrates the use of UCC28880 high-voltage switcher to design an Offline Isolated Flyback converter that can supply greater than 100mA output current. Using 2ndary side feedback control, the design delivers a tighly regulated 3.3V/400mA output that can be used to bias micontrollers and DSPs. In addition the design also provides a 2nd output rail of 12V/30mA that can be used to supply relays and other analog devices.

  • UCC28880-based Isolated Flyback converter
  • Design delivers >100mA output
  • Tightly regulated 3.3V output (<1%, at 25C) using 2ndary side opto-feedback
  • >74% efficiency at full-load on both rails
  • Flyback transformer designed for basic isolation
  • Short-circuit withstand capability of 3 seconds
  • This design is tested and includes test results and CAD files
Output voltage options PMP10143.1 PMP10143.2
Vin (Min) (V) 90 90
Vin (Max) (V) 275 275
Vout (Nom) (V) 12 3.3
Iout (Max) (A) .03 .4
Output Power (W) .36 1.32
Isolated/Non-Isolated Isolated Isolated
Input Type AC AC
Topology Flyback- Non Sync 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.


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

TIDRH72.PDF (253 K)

Detailed schematic diagram for design layout and components

TIDRH73.PDF (112 K)

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

TIDRH74.PDF (208 K)

Detailed overview of design layout for component placement

TIDRH75.ZIP (96 K)

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


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC28880High voltage switcher for Non-isolated AC/DC Conversion

Data sheet: PDF | HTML
Shunt voltage references

LMV431A1%, low-voltage (1.24-V) adjustable precision shunt regulator

Data sheet: PDF

Technical documentation

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Type Title Date
* Test report PMP10143 Test Results Sep. 23, 2015

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