Sorry input would be the 13.8V-14.4V car system.

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Gordon Varney (personal)
Sent: Wednesday, January 24, 2001 9:52 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: +12V and +5V in automoble


Richard,
    You have not stated your input voltage. I assume that if you have tried
a 7805 that you are referencing a low DC value.

National makes a simple switcher. Easy to implement, and there are several
companies that make the inductors as an off the shelf part. Cost effective
and very few components.

12 Vdc @ 2.5 A is 30W, there will not be a cheep solution. But there will be
a least costly solution.

Gordon Varney

> +12V @ 2.5A and +5V @ 1A, what is the best solution can have +/-10% on
them.
>
> I have looked at switching regs but they seem to be not the best for
> availability and require expensive inductors etc for use. I want to build
a
> very cost sensitive device and am looking for other suggestions.
>
> Yes heat is an issue that needs to be addresses also as a 7805 was
attempted
> and man does it get HOT!
>
> Thanks.
> Richard.

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