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Sonsivri > Electronics > General Electronics (Moderators: o2, pickit2) > MC34063 Step-Up converter project
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Ichan
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« on: January 13, 2008, 02:01:50 14:01 »
I saw some post asking for step up dc-dc converter, here i put my project complete with schematic, pcb, excel calculation file, and datasheet. It works fine with 12V input 19V/3A output.
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bk3e
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« Reply #1 on: December 03, 2008, 08:21:56 08:21 »
Did it full working?
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newboy
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« Reply #2 on: December 03, 2008, 10:52:03 10:52 »
Hi guys.

I in thinking of making PWM power supply using DC Step down concept.

What I know, the PWM will control the amount of time of current to flow. For the gate control by PWM, I'm going to use mosfet ie IRFP1710  or some other mosfet as equivalent.

What I want to ask ... how to calculate the uH (coil or inductor) ? Do I need to wind the wire around ferrite core and how many turn and what size wire will be? I'm planning to get max 20A and transformer going to used is 230/15-0-15.

The PWM freq is about 200k using IC 555 as clock generator. I just dont know how to calculate how much inductor/inductance needed and how to make if I need to wind the coil.

Thanks in advance.
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Kwaigo
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« Reply #3 on: December 08, 2008, 09:50:06 09:50 »
I think UC2843 will be much better in such role, as MC33063 or 555 timer. http://focus.ti.com/lit/ds/symlink/uc2843.pdf
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Ichan
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« Reply #4 on: December 09, 2008, 06:57:04 06:57 »
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Did it full working?

Yes it is fully working, I've made it several times. The efficiency is not very high about 70% as I remember.
I'll try to find mine and make some photo of it, but maybe it will take some time.

-ichan
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Jehan
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« Reply #5 on: December 25, 2008, 05:29:21 05:29 »
a more efficient Step up can be made using Linear LTC3703, this Ic can be used as a buck or a boost type of converter and does not require current sense, a small step up can be made to run a Laptop from a cigarette lighter car jack
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belinao
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« Reply #6 on: January 22, 2009, 11:36:11 11:36 »
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What I want to ask ... how to calculate the uH (coil or inductor) ? Do I need to wind the wire around ferrite core and how many turn and what size wire will be? I'm planning to get max 20A and transformer going to used is 230/15-0-15.

The PWM freq is about 200k using IC 555 as clock generator. I just dont know how to calculate how much inductor/inductance needed and how to make if I need to wind the coil.

There are some articles at this site http://www.smps.us , that I have used some times.
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