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joejoe317:
Hey FCB, I looked on the myrra website. Thank you so much for the info.
When looking here for products http://www.myrra.com/en/productsmyrra I clicked on every choice and it did not have tny286 listed on any of them, it did however have the tny268 listed on a bunch. I just want to make sure the numbers weren't flipped.
a google search didn't produce much either.
The two I found to work with the 268 are
power 10-18w EL19 74020;
power 12-24w EF20 74089;
I see that the 286 provides 4A, that would be great but it says it needs a EE22 transformer, I can only seem to see them on aliexpress etc...
On digikey I found this
http://www.powerint.com/sites/default/files/product-docs/tny274-280.pdf
and they have a transformer that is built for it here
http://www.digikey.com/product-search/en?pv1392=4&FV=fff4000c%2Cfff804d6&k=transformer&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25
its 12v at 1A output, but I can buck this and boost the current for the usb.
Looking through all these datasheets, it seems as if powerint is the only one that really gives examples with circuitry. It's really nice to see this.
I did have a question about the example circuitry they gave with the 286 datasheet. What is up with the 2 inductors they show really close together? At first I thought it was another transformer, but then it gives a 10mH value.
fcb:
Don't take this minor rant the wrong way please.
When I was growing up - I'm 41 now - I had a huge stack of old electronics magazines from the mid-70's onwards, I spent many hundreds of hours reading every single article and studying every schematic and description. Data was scarce, I prized my blue National Semi manuals collection more than anything.
Now - more than ever - with the internet and google at hand I am constantly surprised by how people expect to have things handed on a plate.. the cut and paste generation I guess.
NiHaoMike:
Look into PLC. It can often be a better choice than RF.
joejoe317:
--- Quote from: fcb on November 26, 2013, 09:40:45 pm ---Don't take this minor rant the wrong way please.
When I was growing up - I'm 41 now - I had a huge stack of old electronics magazines from the mid-70's onwards, I spent many hundreds of hours reading every single article and studying every schematic and description. Data was scarce, I prized my blue National Semi manuals collection more than anything.
Now - more than ever - with the internet and google at hand I am constantly surprised by how people expect to have things handed on a plate.. the cut and paste generation I guess.
--- End quote ---
I don't take that the wrong way at all. I completely understand where you are coming from. You obviously have the experience that I am lacking. By the time you were my age, you had about 15 years more experience than I do right now. I have looked at a lot of circuits and understand how most of them work. If I have a resource available to me I will try and use it to be quite frank. We don't have a mentor for our project so it is difficult to get simple questions answered sometimes.
I will talk to my group, we may drop the 5v 2A line because of cost, and the other powersupply I originally mentioned is not isolated. Flyback transformers are extremely dangerous so I am trying to get as much info as possible. Sometimes I am not sure of somethings in schematics. I am not a microelectronic engineer, my main focus is power. A majority of the things I deal with are with fault studies, 3 phase voltages, and generators.
I really appreciate your input regardless of the situation. I am taking what you say and am actually researching based off of that. I have found out a lot more about these things based off the links you provided. I also know now that the tny286 requires a EE22 transformer. Have yet to find one, and places like digikey do not isolate based off of these parameters. I have always learned two inductors close together are transformers. I have a feeling in this case that this is not true.
Again sorry for taking up your time, but again, I really want you to know that I appreciate the time and effort you put into leading me in the right direction.
Ton:
Hi
The two inductors close together is a common mode coil, used to reduce noise
You could argue that it is a kind of transformer used to make the current in the two coi!s equal and in opposit direction.
Sorry for my English, hope it is understandable :o
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