• Menu
  • Product
  • Email
  • PDF
  • Order now
  • Flyback Selection Guide

    • SLUAAE5 June   2022 TL2842B , UCC2813-2 , UCC28600 , UCC28704 , UCC28730 , UCC28740 , UCC28742 , UCC28781 , UCC28782 , UCC28C42

       

  • CONTENTS
  • SEARCH
  • Flyback Selection Guide
  1. 1Application Brief
  2. IMPORTANT NOTICE
search No matches found.
  • Full reading width
    • Full reading width
    • Comfortable reading width
    • Expanded reading width
  • Card for each section
  • Card with all content
APPLICATION BRIEF

Flyback Selection Guide

1 Application Brief

Flyback controllers are inherently isolated topologies which are ideal for offline (AC/DC) conversion. Flyback controllers are available with two control methods. The first is Primary-Side Regulation (PSR) which use the information from the auxiliary transformer winding to regulate the output and the other is Secondary-Side Regulation (SSR) which uses an optocoupler to provide more accurate feedback.

What are the pros and cons of Primary Side Regulation (PSR) vs. Secondary Side Regulation (SSR)? The following is a simple summary and a short list of popular controllers for each:

Figure 1-1 SSR Control
Figure 1-2 PSR Control

Pro – Tighter output voltage regulation (~2%) and faster load transient response

Con – Requires Opto-coupler and shunt regulator

Pro – No Opto-coupler and shunt regulator

Con – Less accurate voltage regulation (~5%) and slower load transient response

Are you wondering when to choose Continuous Conduction Mode (CCM), Discontinuous Conduction Mode (DCM), or Transition Mode also known as Critical Conduction Mode (TM/CrM)? Table 1-1 highlights the pros and cons of each.

Table 1-1 Pros and Cons of CCM, DCM, or TM/CrM
Operating Mode Pros Cons TI Product Family
CCM Lower conduction and switching losses
Improved cross regulation
Smaller filtering solution
Low light-load efficiency
Higher diode reverse recovery loss
More difficult to compensate and stabilize
General Purpose PWM Controllers
DCM No diode reverse recovery loss
Improved stability
Potentially smaller transformer size
Higher ripple currents
Higher conduction and switching losses
Larger filtering solution
TM (CrM) No diode reverse recovery loss
Valley or Quasi Resonant (QR) switching
Improved stability
Higher ripple currents
Higher conduction and switching losses if not used with valley switching or QR mode
Larger filtering solution
Dedicated Flyback Controllers

Texas Instruments has Flyback controllers to support a wide variety of applications ranging from low power bias to high power density supplies. Our dedicated Flyback controllers combine our advanced control law to minimize switching losses and EMI by adjusting their switching frequency as a function of load. For high-power density or if you want to use a flyback more than 100 watts, check out our Zero-Voltage Switching (ZVS) and Active-Clamp Flyback (ACF) controllers.

Figure 1-3 is a quick selection guide for our controllers. To see more visit Flyback Controllers.

Figure 1-3 Flyback Selection Guide

IMPORTANT NOTICE AND DISCLAIMER

TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATASHEETS), DESIGN RESOURCES (INCLUDING REFERENCE DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS” AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS.

These resources are intended for skilled developers designing with TI products. You are solely responsible for (1) selecting the appropriate TI products for your application, (2) designing, validating and testing your application, and (3) ensuring your application meets applicable standards, and any other safety, security, or other requirements. These resources are subject to change without notice. TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource. Other reproduction and display of these resources is prohibited. No license is granted to any other TI intellectual property right or to any third party intellectual property right. TI disclaims responsibility for, and you will fully indemnify TI and its representatives against, any claims, damages, costs, losses, and liabilities arising out of your use of these resources.

TI’s products are provided subject to TI’s Terms of Sale (www.ti.com/legal/termsofsale.html) or other applicable terms available either on ti.com or provided in conjunction with such TI products. TI’s provision of these resources does not expand or otherwise alter TI’s applicable warranties or warranty disclaimers for TI products.

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 

Copyright © 2022, Texas Instruments Incorporated

Texas Instruments

© Copyright 1995-2025 Texas Instruments Incorporated. All rights reserved.
Submit documentation feedback | IMPORTANT NOTICE | Trademarks | Privacy policy | Cookie policy | Terms of use | Terms of sale