Subject: Re: Low cost 12 volt step up
Date: Tue, 22 Oct 2002 04:28:43 -0700
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A couple of points:
If regulation is not important, use the battery voltage directly.
If accuracy and regulation are important, tell us the requirements.
Are you saying that you don't care if the circuit works from ~10V to ~15V
input, a typical range for discharged to fully charged? (Assumes SLA or
Design options are fewer if the input voltage can be either above or below the
When I see round numbers, I jump to the conclusion that they were pulled
of the air without much thought. That's not your problem, it's mine.
Another conclusion jump I make is that (battery powered = efficiency
Is the load 1.00 amp constant? If it is, you might be able to be more clever
than if you had to design to the general case.
Take a look at the datasheet for the Motorola MC34063 for ideas.
This may be an obsolete part by now, but the ideas are still valid.
As always, the specification is the most critical part of a project.
The Apocalypse wrote:
> Hi. I need to step up the nominal ~12.5 volts of a 12 volt wet battery to
> about 15 volts, 1 amp. Regulation is not important in this phase so I am
> opting to bypass prefab dc/dc converters.
> Thank you.
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