12v=19v 4,7A dcdc - Page 19

gmarsh · 1st November 2008, 03:42 PM

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.

gev · 07:39 AM

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

luka · 23rd April 2010, 11:56 AM

looks good, a bit big, but depends for what you use it for

bmx666 · 25th June 2010, 04:28 PM

hi
i'm so sry,but i have to know it!
what is F1 in the list?
(F1=8A)
so sorry.thanks

star882 · 25th June 2010, 06:19 PM

That's a fuse.

bmx666 · 27th June 2010, 07:25 PM

hi
does any IC Similar UC3843 for this kit?
i need another IC because i can't find this one!
thanks

star882 · 27th June 2010, 08:00 PM

Quote:

Originally Posted by bmx666

hi
does any IC Similar UC3843 for this kit?
i need another IC because i can't find this one!
thanks

Try the LT1247.

bmx666 · 27th June 2010, 08:34 PM

Quote:

Originally Posted by star882

Try the LT1247.

sry
and for diod ( MBR1645)?

Th3 uN1Qu3 · 27th June 2010, 10:02 PM

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.

hobbiest · 10:06 PM

Quote:

Originally Posted by gev

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

23rd April 2010, 07:26 AM	#182
gev diyAudio Member Join Date: Jul 2005 Location: Turkey	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 __________________ 320volt.com Elektronik ve biraz daha fazlası Last edited by gev; 23rd April 2010 at 07:39 AM.

23rd April 2010, 11:56 AM	#183
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	looks good, a bit big, but depends for what you use it for __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

25th June 2010, 06:19 PM	#185
star882 diyAudio Member Join Date: Mar 2007	That's a fuse. __________________ "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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25th June 2010, 04:28 PM	#184
bmx666 diyAudio Member Join Date: Jun 2010	hi i'm so sry,but i have to know it! what is F1 in the list? (F1=8A) so sorry.thanks

27th June 2010, 07:25 PM	#186
bmx666 diyAudio Member Join Date: Jun 2010	hi does any IC Similar UC3843 for this kit? i need another IC because i can't find this one! thanks

27th June 2010, 10:02 PM	#189
Th3 uN1Qu3 diyAudio Member Join Date: Feb 2010 Location: Bucharest	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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