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'[EE], MC34063 for 20A'
2009\07\17@145230 by Pablo Ginhson

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Hello to all,

Has anyone do it a DC-DC converter with this IC, MC34063, for current around 20A?

I do it with an external mosfet for 3A and work very well, but I don´t be sure if this IC can work with an external P MOSFET for 20A.

If anyone have any suggestion, will be good.

Thanks to all



Pablo Ginhson

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2009\07\18@095653 by M.L.

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On Fri, Jul 17, 2009 at 2:52 PM, Pablo Ginhson<spam_OUTpginhsonTakeThisOuTspamhotmail.com> wrote:
>
> Hello to all,
>
> Has anyone do it a DC-DC converter with this IC, MC34063, for current around 20A?
>
> I do it with an external mosfet for 3A and work very well, but I don´t be sure if this IC can work with an external P MOSFET for 20A.
>
> If anyone have any suggestion, will be good.
>
> Thanks to all
>
>
>
> Pablo Ginhson

What are your input and output voltages, and what does the circuit
look like? It's not possible to say without knowing more about the
circuit. But, in general, 20A for any P-channel device is really
pushing the limit.
-
Martin

2009\07\18@141747 by Alan B. Pearce

face picon face
>I do it with an external mosfet for 3A and work very well,
>but I don´t be sure if this IC can work with an external
>P MOSFET for 20A.

This would probably require some serious analysis of the output current
capability of the chip to see if it can drive the gate capacitance of the
FET. A 20A FET will have significantly higher gate capacitance than a 3A
FET, so your switching currents will be much greater.

2009\07\18@143304 by Mike Harrison

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On Sat, 18 Jul 2009 19:18:10 +0100, you wrote:

>>I do it with an external mosfet for 3A and work very well,
>>but I don´t be sure if this IC can work with an external
>>P MOSFET for 20A.
>
>This would probably require some serious analysis of the output current
>capability of the chip to see if it can drive the gate capacitance of the
>FET. A 20A FET will have significantly higher gate capacitance than a 3A
>FET, so your switching currents will be much greater.

At that current you'll be paying enough for magnetics and FETs that you really should look at paying
a little more for a controller designed for this power level instead of trying to bodge a cheaper
part into doing something it isn't really designed for. If nothing else the saving in heatsinking
will probably pay for the cost of a more efficient controller.

There are approximately one gazillion DC-DC chips out there so I'm sure you'll find something more
suitable.

2009\07\20@163618 by Bob Axtell

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and the MC34063 is REALLY long of tooth....

On 7/18/09, Mike Harrison <.....mikeKILLspamspam@spam@whitewing.co.uk> wrote:
{Quote hidden}

>

2009\07\20@165715 by Funny NYPD

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Indeed. Any alternative candidate with higher frequency at similar cost?

Funny N.
Au Group Electronics, http://www.AuElectronics.com
http://www.AuElectronics.com/products
http://augroups.blogspot.com/




________________________________
From: Bob Axtell <bob.axtellspamKILLspamgmail.com>
To: Microcontroller discussion list - Public. <.....piclistKILLspamspam.....mit.edu>
Sent: Monday, July 20, 2009 4:16:47 PM
Subject: Re: [EE], MC34063 for 20A

and the MC34063 is REALLY long of tooth....


     

2009\07\31@170807 by Pablo Ginhson

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What I need is a DC-DC converter for 17A for only the first 1 minute, then the system will need only 5A

Vdc input 24 V from 2 batt (truck) VDC output 24V. I know that is dificult to make a DC DC with the same input and output, I think that I can use a Boost-buck configuration for this.

Any suggestions?



Pablo



{Quote hidden}

> -

2009\07\31@173132 by Bob Blick

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On Fri, 31 Jul 2009 21:08:01 +0000, "Pablo Ginhson"
<KILLspampginhsonKILLspamspamhotmail.com> said:
>
> What I need is a DC-DC converter for 17A for only the first 1 minute,
> then the system will need only 5A
>
> Vdc input 24 V from 2 batt (truck) VDC output 24V. I know that is
> dificult to make a DC DC with the same input and output, I think that I
> can use a Boost-buck configuration for this.
>
> Any suggestions?

Hi Pablo,

It's real easy if you are good with magnetics. Here's a design I did
with the UC3843 and SEPIC topology which is ideal when the input and
output are similar voltages. You will of course need to remove the +5V
section and modify the turn-on section and scale the whole thing up to
your voltage and current, but the basic schematic can remain the same:

http://bobblick.com/techref/projects/mp3book/mp3book.html

Cheerful regards,

Bob

--
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'[EE], MC34063 for 20A'
2009\08\11@035506 by Pablo Ginhson
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Thank you Bob,

I will try with your experienced power supply.

Kind regards, from the end of the world....

Pablo Ginhson

{Quote hidden}

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