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'[ee]: 35 to 40 Volt Output Charge Pump'
2001\08\29@044233 by Graham North

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Hi

Does anyone know of a circuit to generate 35 to 40 Volt output?

The Voltages available to power the circuit are:

3.3V, or 5V, or 10V, or 20V

Thanks

Graham North, BEng(Hons), AMIEE
Castle Group Ltd
Salter Road
Scarborough
North Yorkshire
YO11 3UZ

Tel No: 01723 584250
Fax No: 01723 583728
E-Mail: spam_OUTgrahamnorthTakeThisOuTspamcastlegroup.co.uk

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2001\08\29@052312 by Alan Gorham

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Hi Graham

You could look at the LM2577 - ADJ from national semiconductor.
It is a switching regulator and it can go up to 60V max out.

I have been using it as a 12-24V doubler for which it is ideally suited.

You can view the data sheet at:

http://www.national.com/ads-cgi/viewer.pl/ds/LM/LM1577.pdf

Regards

Alan

Embedded Systems Engineer
Microtima Ltd
Ouseburn Mews
3-7 Stepney Bank
Newcastle upon Tyne
NE1 2PW

Tel: 0191 2304411
Fax: 0191 2304422


{Original Message removed}

2001\08\29@071354 by mike

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On Wed, 29 Aug 2001 09:34:03 +0100, you wrote:

>Hi
>
>Does anyone know of a circuit to generate 35 to 40 Volt output?
>
>The Voltages available to power the circuit are:
>
>3.3V, or 5V, or 10V, or 20V
>
>Thanks
How much current do you need ? If low (a mA or two), a charge-pump based on a 4049 hex inverter (2
gates for the oscillator, and two pairs of parallelled gates as
drivers) ruuning from the 10V supply will be the cheapest option.
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2001\08\30@034735 by Graham North

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> I would really like surface mount components.  Does anyone know of any
> Maxim or similar
> products that will work.  Space is to a premium.
>
> Thanks
>
>
> {Original Message removed}

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