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agk
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re: Flyback converter simplifies isolated power design
agk   10/19/2012 12:56:28 PM
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This is a clever design without the need for an opto coupler to sense the secondary side and to feed the primary side to regulate the secondary output.Many people will like to use this design even though the output load regulation is average.

M2002
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re: Flyback converter simplifies isolated power design
M2002   10/20/2012 5:51:24 AM
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Indead the load and line regulation is less than 1% across full load and line range (page 3).

Etmax
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re: Flyback converter simplifies isolated power design
Etmax   10/23/2012 12:10:00 AM
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Not a very new technique, but much more practical when integrated into the IC. My only gripe with this method is the accuracy obtainable. I tend to do the sensing on the secondary and then use the opto as a critical switch. You get better regulation and the opto plays less of a role in accuracy. Stability is still an issue of course, but it becomes the same for each unit built making it something you can deal with.

M2002
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re: Flyback converter simplifies isolated power design
M2002   10/23/2012 5:43:44 AM
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What kind of accuracy are you looking for? What do you think of the load and line regulation in Figure 3? Thank you!

studleylee
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re: Flyback converter simplifies isolated power design
studleylee   10/24/2012 4:59:03 PM
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@ETmax of course the ordinary crowd does it with an isolated device off the secondary, that's what makes this novel. that's why this way is cool and cheaper. You can always regulated down from the 5v rail.

krh
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re: Flyback converter simplifies isolated power design
krh   10/23/2012 12:35:21 AM
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Bruce, a couple of questions: - I didn't see any discussion in your article about efficiency (but maybe I just missed it). - Does the design scale to higher output power..??

M2002
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re: Flyback converter simplifies isolated power design
M2002   10/23/2012 5:51:23 AM
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Krh, to answer your question: 1) 85% peak efficiency for 5V output and 87% peak efficiency for 12V output. A more detailed discussion can be found (http://cds.linear.com/docs/LT%20Journal/LTJournal-V22N3-06-df-LT8300-MinChen.pdf). 2) It does scale and you get better efficiency for higher output power. Check LTC's No-Opto Product Family. Thank you!



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