How to Design a DC-DC Flyback Converter Operating in CCM and DCM?

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Discussion Overview

The discussion revolves around the design and control of a DC to DC flyback converter that operates in both Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM). Participants seek guidance on starting points, special characteristics of these converters, transformer sourcing, MOSFET selection, and relevant reference designs or datasheets.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant asks for guidance on where to start with designing a flyback converter and what makes these converters unique.
  • Another participant inquires about the context of the question, suggesting that it may relate to schoolwork and asks about prior research done.
  • References to the National Semiconductor Simple Switcher series are made, with a suggestion that it may provide useful information, although its compatibility with flyback topology is uncertain.
  • A participant mentions Fairchild application notes as detailed resources for flyback converters and shares past experiences with design aids from Coilcraft.
  • Power Integrations is noted as a company that supports flyback designs, offering evaluation kits and transformer purchasing options.
  • A recommendation is made for the book "Switch-mode power supplies" by Basso, highlighting its clarity in explaining design principles.

Areas of Agreement / Disagreement

Participants generally agree on the importance of good references and resources for designing flyback converters, but there is no consensus on specific design approaches or the best sources for components.

Contextual Notes

Participants express varying levels of familiarity with the topic, and there are references to specific application notes and design aids that may not be universally applicable. The discussion does not resolve which resources are definitively the best for all scenarios.

Who May Find This Useful

This discussion may be useful for individuals interested in power electronics, specifically those looking to design flyback converters or seeking resources for related academic projects.

aabrahim
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Hi everyone,

I need your help in designing and controlling a DC to DC flyback converter that operate in both CCM & DCM. where to start? and what is special about these kind of converters? and will i find a ready-made transformer for such a converter? how to choose the right MOSFET? what parameters will play the role of deciding the operation mode?
can you suggest a reference-design or a datasheet so i can start the job.

many thanks in advance

Regards
 
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aabrahim said:
Hi everyone,

I need your help in designing and controlling a DC to DC flyback converter that operate in both CCM & DCM. where to start? and what is special about these kind of converters? and will i find a ready-made transformer for such a converter? how to choose the right MOSFET? what parameters will play the role of deciding the operation mode?
can you suggest a reference-design or a datasheet so i can start the job.

many thanks in advance

Regards

Welcome to the PF.

What is the context of your question? Is this for schoolwork?

What research have you done so far? Have you looked at the National Semiconductor Simple Switcher series? I don't know offhand if they support the flyback topology, but you can learn a lot from the Simple Switcher series of parts & support docs.
 
a google on those terms takes one to Fairchild appnotes that appear very detailed.

a few years ago i thought i was going to get into such a project and did some looking. At that time Coilcraft had interactive design aids that looked extremely easy to use, which was what i needed.

I also echo Berkeman's sentiment about National's simple switchers..
they have excellent application notes.
i started with AN556, AN711 and AN1253
though they might be too basic for you..
 
I know Power Integrations supports flyback designs.
http://www.powerint.com/
They sell evaluation kits and have links to purchase the transformers used in many of their designs.
 
To do this right you need good references. I highly recommend "Switch-mode power supplies" by Basso. He is gifted at explaining how these things work and how they should be designed in the real world.
 

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