85-VAC - 480-VAC input, multiple output flyback reference design PMP30281 (ACTIVE)

Description & Features

Technical Documents

Support & Training

Order Now

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

Key Document


This offline flyback reference design uses the UCC28722 controller to generate 2 isolated outputs (5 V at 400 mA, 24 V at 300 mA) from an AC input (85 VAC - 480 VAC). The UCC28722 output drive interfaces to a bipolar transistor power switch, enabling a more efficient design than a typical design. The valley-switching technique reduces switching losses and keeps the efficiency high. The controller provides constant-voltage and constant-current regulation without the use of an optical-coupler.

  • 180-VAC - 264-VAC input to 3 isolated outputs
  • Primary-side regulation eleminates the need for an optical-coupler
  • Valley-switching operation keeps the efficiency high
  • Dynamic BJT drive enables lower cost converter design

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)
(Output Voltage 2)
Vin (Min) (V)8585
Vin (Max) (V)480480
Vout (Nom) (V)524
Iout (Max) (A).4.3
Output Power (W)27.2
Input TypeACAC
TopologyFlyback- Quasi ResonantFlyback- Quasi Resonant

TI Devices (1)

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
UCC28722  Low-Cost CVCC Flyback Controller With Primary-Side Regulation for Bipolar Power Device  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
UCC28722 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 Documents

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

User guides (1)
Title Type Size (KB) Date
PDF 8501 12 Dec 2018
Design files (6)
Title Type Size (KB) Date
ZIP 145 12 Dec 2018
ZIP 567 12 Dec 2018
PDF 260 12 Dec 2018
PDF 210 12 Dec 2018
PDF 31 12 Dec 2018
PDF 142 12 Dec 2018

Support & training

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