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Old 9th December 2007, 06:20 AM   #1
cjk2 is offline cjk2  United States
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Default Rate my 12v to 19v converter please!

I designed this boost converter with a UC3843 chip using all SMD parts. I based the current limiting section around the design found on this page, although i honestly don't totally understand it. http://dion.swamp.dk/carpower.html

If anyone is intersted, i would love to hear any input/suggestions about my design/if it will work.

Thanks, Chris
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Old 10th December 2007, 10:59 PM   #2
cjk2 is offline cjk2  United States
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Old 10th December 2007, 11:24 PM   #3
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I am not able to help but hopefully someone will soon.
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Old 12th December 2007, 03:13 AM   #4
cjk2 is offline cjk2  United States
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Actually, i redesigned it, built it and it works great. Im getting something like 90% efficiency for 13.8v in and 19.5v out
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Old 21st December 2007, 01:14 PM   #5
mflorin is offline mflorin  Romania
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Just a thought:
I would minimize the parasitic capacitance on MOSFET's drain (also applicable for diodes) by reducing the copper area. In this way the EMC behavior can be improved.
I know that reducing copper area is contradictory if you think for power losses but the generated heat is spreading pretty well through PCB itself.
Moreover, a massive groun plane will play a significant role for both EMC and cooling.
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Old 30th December 2007, 03:43 PM   #6
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cjk2-

Do you have a schematic? It's probably a variation of the many out there as this topology can't vary too much. Here is a 2-F DC-DC I did for one of my ham radio buddies a couple of years ago. It uses an SG3525 alternately switching two MTP75N06s at about 100kHz (50kHz per MOSFET). The basic topology is much like your '3843-driven one, except that both inductors are wound on the same toroid, bifilar. Output diode is MBR2545CT, putting out 19.5V at over 8A, when necessary. Whole thing gets only moderately warm.
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File Type: jpg sg3525 dc-dc uppie 1 (512 x 384).jpg (77.3 KB, 475 views)
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Old 30th December 2007, 03:45 PM   #7
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Here is another angle.....

I used an old Dell AC-DC psu box (not sure of the number, PA-1, PA-2, etc.) as the enclosure, and even mounted the green LED in the same place as the original off-line board....
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Old 30th December 2007, 03:52 PM   #8
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Here is the schematic. I am also working on a UC3843-driven one. Have all the parts, but it might be a few weeks before I can scrape together a board.
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Old 30th December 2007, 03:54 PM   #9
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,.....and the '3843 schematic.....
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Old 30th December 2007, 04:35 PM   #10
cjk2 is offline cjk2  United States
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Sadly I never drew a schematic for it, I usually just do it in my head. My design is based on this one though. The current limiting system is all that I don't totally understand, and it seems to work well enough based on the prototype I built. Anyway, I have attached a full eagle PCB file for anyone interested. I went with a to-220 MOSFET and diode for better cooling. I intend to have a few of these boards professionally made soon.
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