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Old 1st November 2008, 02:42 PM   #181
gmarsh is offline gmarsh  Canada
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Quote:
Originally posted by N-Channel
As for flux-wlking, see post #74, this thread. As opposite phase is energized, any flux remaining in the core is canceled out.
Flux "cancellation" only happens if the volt-second/turn product of the opposite phase equals that of the first phase - ie. perfect duty cycle balance. Your design doesn't guarantee that.

During deadtime, the transformer may reset itself through the MOSFET body diodes or something. I'll have to simulate this thing and find out.
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Old 23rd April 2010, 06:26 AM   #182
gev is offline gev  Turkey
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12v=19v 4,7A dcdc circuit schema and pcb new download link: 4shared.com - online file sharing and storage - download uc3843-19volt-dcdc.zip pcb 12-19V 95W-DCDC UC3843 .LAY open sprint layout viewer http://www.abacom-online.de/html/dat...ewlayout50.exe
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Last edited by gev; 23rd April 2010 at 06:39 AM.
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Old 23rd April 2010, 10:56 AM   #183
luka is offline luka  Slovenia
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looks good, a bit big, but depends for what you use it for
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Old 25th June 2010, 03:28 PM   #184
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hi
i'm so sry,but i have to know it!
what is F1 in the list?
(F1=8A)
so sorry.thanks
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Old 25th June 2010, 05:19 PM   #185
star882 is offline star882  United States
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That's a fuse.
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"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
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Old 27th June 2010, 06:25 PM   #186
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hi
does any IC Similar UC3843 for this kit?
i need another IC because i can't find this one!
thanks
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Old 27th June 2010, 07:00 PM   #187
star882 is offline star882  United States
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Quote:
Originally Posted by bmx666 View Post
hi
does any IC Similar UC3843 for this kit?
i need another IC because i can't find this one!
thanks
Try the LT1247.
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Old 27th June 2010, 07:34 PM   #188
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Quote:
Originally Posted by star882 View Post
Try the LT1247.
sry
and for diod ( MBR1645)?
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Old 27th June 2010, 09:02 PM   #189
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Okay i've only read the first pages, but i do have a question. I couldn't believe that the inductor is wound on that yellow core but it appears to be so. 19 volts at 4.7A is quite darn close to 100 watts, are you serious that the little powdered iron donut works at that power? I have dozens of those around and they're quite a bit easier to work with than EE/EI cores, at least for my hands that is.

I'm planning to run in discontinuous mode too, using pulse skipping as the control method. You'll be surprised as to what my controller chip will be. Next week i'll be building the first low-power version and if all is well i'll try a larger one.
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Old 29th October 2011, 08:42 PM   #190
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Quote:
Originally Posted by gev View Post
Click the image to open in full size.
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Click the image to open in full size.
Transformer EI33 --10x0.5mm prallel 20 tour
PCB view and print program
Download

PCB SCHDownload
************************************************** ***
hi, why i am unable to download PCB SCH file.
can you pls provide good link for the same, i also visited your site, as its not in English, i couldnot find it there too.
pls provide link for the same.
regards

EDIT:- I got the File from 4shared Link. Thanks
BTW is this circuit from Electronics For You

Last edited by hobbiest; 29th October 2011 at 09:06 PM.
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