UPDATE: as suggested, I split this question into separate parts (links below). I left the last one here. It is so silly I am rather proud of it ;)

UPDATE 2: it seems that breaking one post into multiple questions only annoyed people, which wasn't my intention. Please, accept my apologies for the spam.

Over past few weeks I've been reading LT datasheets and application notes and everything I googled on the web. While I think I am getting the basics right, some rather unexpected questions popped up and I could not find definite answer to them. I'd appreciate any help or even a point to the reading material I could use, something like "flyback for dummies" would be the best :)

Switch voltage drop

Isolated secondary coils

Calculating minimum primary turns - Answered

Wire selection - Answered

DZ snubber - Answered

Final question, if the load draws pulsed power and output caps are sufficiently big can I use average load current for the purpose of DC-DC calculations?
For example if output is modulated at 50% duty, can I use 1/2 of its current as secondary coil current?

  • 3
    \$\begingroup\$ You should read the 'help' section on asking questions. You have many questions that would take a book to answer. Please narrow this down to a couple of the most important ones. Surfing the Web with key words can answer a lot of what you ask. As it is right now it is too broad in scope to answer. \$\endgroup\$ – user105652 May 28 '18 at 23:19
  • \$\begingroup\$ I thought about this before posting and decided that since these all related to essentially same task it would be nice to have them together. And I mentioned that I did spend two weeks looking for the answers before asking. Anyway, if you think this is inappropriate way to ask questions I am sure someone will close it eventually. \$\endgroup\$ – Maple May 28 '18 at 23:25
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    \$\begingroup\$ Ahem...It is the number of questions you are asking about a very complex device-a multi output flyback power supply. Only a skilled engineer would attempt it, and your many questions tell us you have no skills. I think I am getting the basics right. You need to be far beyond that to even consider building a flyback SMPS. \$\endgroup\$ – user105652 May 28 '18 at 23:41
  • 1
    \$\begingroup\$ Granted, but start small, not by building the equivalent of a spaceship or robot. The board layouts are crucial, so build a much simpler buck/boost converter first. \$\endgroup\$ – user105652 May 28 '18 at 23:53
  • 2
    \$\begingroup\$ Bringing an attitude to this site is not good. We know of what we speak. You have too much wishful thinking, and no skills. We are not joking when we suggest you start small, and work your way up. Btw, a SMPS is close to rocket science. \$\endgroup\$ – user105652 May 29 '18 at 1:02

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