15-W, wide-input flyback reference design
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.

Description & Features

Technical documentation

Support & Training

Order Now

See the Important Notice and Disclaimer covering reference designs and other TI resources.

Key Document


This reference design uses a UCC28742 flyback controller and an ATL432LI shunt reference to produce an isolated 24-V output capable of 0.625 A from an 85-V to 480-Vac input. All components are placed on one side of the board to reduce complexity and cost. The design can achieve 80% efficiency across various input conditions.

  • Compact size (2" x 3.31") minimizes solution size area
  • Single-side assembly and 2-layer PCB for reduced manufacturing costs
  • Low noise output of less than 100-mV peak-to-peak voltage ripple for sensitive loads

See the Important Notice and Disclaimer covering reference designs and other TI resources.


Schematic/Block Diagram

Quickly understand overall system functionality.

Download Schematic

Design Guide

Get results faster with test and simulation data that's been verified.

Download Design Guide

Design Files

Download ready-to-use system files to speed your design process. Get Viewer.

Download Design Files

(Output Voltage 1)
Vin (Min) (V)85
Vin (Max) (V)480
Vout (Nom) (V)24
Iout (Max) (A).625
Output Power (W)15
Input TypeAC
TopologyFlyback- Quasi Resonant

TI Devices (2)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ATL432LI  High-bandwidth, low-IQ programmable shunt regulator (pinout: RKA)  Voltage references  Sample & Buy Not Available
UCC28742  High-Efficiency Flyback Controller with 1% Output regulation accuracy  Offline & isolated DC/DC controllers & converters  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ATL432LI Download
UCC28742 Download Download

Texas Instruments and Accelerated Designs, Inc. have collaborated together to provide TI customers with schematic symbols and PCB layout footprints for TI products.

Step 1: Download and install the free download.

Step 2: Download the Symbol and Footprint from the CAD.bxl file table.

Technical documentation

See the Important Notice and Disclaimer covering reference designs and other TI resources.

User guide (1)
Title Type Size (KB) Date
PDF 2543 27 Jan 2020
Design files (6)
Title Type Size (KB) Date
PDF 133 27 Jan 2020
ZIP 952 17 Jan 2020
ZIP 743 17 Jan 2020
PDF 225 17 Jan 2020
PDF 133 17 Jan 2020
PDF 779 17 Jan 2020

Support & training

TI E2E™ forums with technical support from TI engineers

Search our extensive online knowledge base where millions of technical questions and answers are available 24/7.

Search answers from TI experts

Content is provided 'AS IS' by the respective TI and Community contributors and does not constitute TI specifications.
See terms of use.

If you have questions about quality, packaging, or ordering TI products visit our Support page.

Technical articles