1. Skip to navigation
  2. Skip to content
  3. Skip to sidebar

How To Design a Simple Isolated Flyback Converter - LT3573

Mike Negrete - Design Eng. Section Leader Mar 15th 2009

Isolated power supplies are needed in a wide variety of applications. Galvanic isolation is achieved by isolating two or more circuits using a transformer or optocoupler, and is desirable for many reasons: safety, noise immunity, circuit protection, etc. Traditionally, isolated power supplies use an optocoupler to transfer regulation information across the isolation barrier. An optocoupler’s gain characteristic varies widely over temperature and over lifetime and since it appears in the feedback loop, it presents significant challenges with regards to the loop compensation of the power supply. Linear Technology’s LT3573 uses innovative internal circuitry to obsolete the optocoupler, greatly simplifying the design of an isolated flyback converter.

How To Design a Simple Isolated Flyback Converter - LT3573

 


Software

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.