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'[EE]: Boost Regulator recommendations'
2002\09\24@125653 by Brian Aase

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I need a small boost regulator: Input can be either 3.3V or 5V
(both supplies avaliable on the PCB, doesn't matter which I
use) and the output is +48V @ about 20 mA, regulated.  Does
anyone have a "favorite" chip that they would recommend for
this job?  It would be great to find one with an on-chip
switching device, but I can't seem to find anything that can
handle the +48 volts without an external transistor.
All suggestions appreciated!
Brian Aase

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2002\09\24@154447 by Mike Singer

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Brian Aase wrote:
> I need a small boost regulator: Input can be either 3.3V or 5V
> (both supplies avaliable on the PCB, doesn't matter which I
> use) and the output is +48V @ about 20 mA, regulated.  Does
> anyone have a "favorite" chip that they would recommend for
> this job?  It would be great to find one with an on-chip
> switching device, but I can't seem to find anything that can
> handle the +48 volts without an external transistor.

Few extra diodes and capacitors and you can boost up
output of any step-up DC/DC converter similar to boosting
TV tubes voltages.

Mike.

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2002\09\25@162823 by Roman Black

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Brian Aase wrote:
>
> I need a small boost regulator: Input can be either 3.3V or 5V
> (both supplies avaliable on the PCB, doesn't matter which I
> use) and the output is +48V @ about 20 mA, regulated.  Does
> anyone have a "favorite" chip that they would recommend for
> this job?  It would be great to find one with an on-chip
> switching device, but I can't seem to find anything that can
> handle the +48 volts without an external transistor.
> All suggestions appreciated!


Brian, have you considered a 555 timer driving
a BC337, in a basic boost configuration? Since you
have regulated 5v to run the 555 timer chip you
get an on board temp-compensated ref and comparator,
timed off period and a digital output to drive the
7 cent transistor.
In a 20 cent chip. :o)

The fast diode good for 60v may be harder to find?
Which diodes do the other circuits suggest?

I did some playing last week with the 555 and it
would do what you want here, ie good 48v regulation
and max power limited for low $$.
-Roman

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