Re: Power regulation.

look a little closer. the -adj version will do 18 volts output at 2 amps.

you can regulate down fron there.

Use Websim to test you design.


"Colin Dawson" <newsgroups@xxxxxxxxxxxx> wrote in message
news:jrMce.3491$Cq2.1998@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Not bad, but I'm looking to get 12,13.8 & 15 volts as a minimum. Looking
> at the Data***, the LM2587 will only give 12 volt max, which is short of
> the 18v ideal and 15v that I actually need.
>
> To explain a little further, the regulator will be used to provide a clean
> constant power supply to a computerised telescope. I'm looking to
> overengineer, this part of a larger project, so that it will be easy to
> use the design on other scopes. My telescope works on a voltage between
> 12 and 15 volts. But it works best on 15v. I don't know why the
> manufacturer's didn't bother, but the scope doesn't regulate it's own
> power... One simple solution to this is to use a dedicated battery for
> the scope, but even then it's only producing 12V, from research, different
> makes and models of telescope have different power requirements. My
> Telescope works best on 15v, the next model up prefers 18v, the next model
> down from mine needs 12v. Some other brands of scope prefer 13.8V.
> Ideally the regulator circuit will be able to turn an unregulated battery
> supply into a very stable supply, which will help to improve the ability
> of the scope to track and slew with high precision, it's good now, but I
> think this will help to make it even better. This is important as I'm
> basically trying to get the scope to move as smoothly as possible so that
> it can track moving objects accuratly for hours at a time.
>
> Regards
>
> Colin.
>
> "Mook Johnson" <mook@xxxxxxxx> wrote in message
> news:MwKce.31564$AE6.923@xxxxxxxxxxxxxxxxxxxxxxx
>> LM2587-adj
>>
>> www.national.com
>> Use feedback resistors to change the output voltage.
>>
>>
>>
>> "Colin Dawson" <newsgroups@xxxxxxxxxxxx> wrote in message
>> news:H0Jce.7870$j54.5302@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
>>> Hi all.
>>>
>>> I'm looking to build a power regulator. However, it's not as straight
>>> forwards as I first thought. Basically, I'm looking to have a variable
>>> input voltage that ranges between 11v and 13.8v (an 85Ah Lead Acid
>>> battery). The output from the regulator will need to be able to support
>>> a continuous 2A, at 15V. Instead of making a fixed regulator, I'd like
>>> to overengineer it so that it is switchable between 12v, 13.8v, 15v and
>>> possibly 18v (although this can be ommitted).
>>>
>>> Can anyone give me some pointers one how to go about doing this.
>>>
>>> Regards
>>>
>>> Colin Dawson
>>> www.cjdawson.com
>>>
>>
>>
>
>


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