Re: Reducing Car 12VDC to 10VDC, I need help

Ron G wrote: 
Hi---
Is there an IC that is made for car battery voltage reduction, and is
"stable" ?
If I remember, a car system goes up to about 14.4 volts while charging, then
down to about 13.8 VDC, plus has a terrible ripple due to the 3 phase
winding setup from the ac/dc conversion by the diodes at the alternator.

I need a nice smooth 10 VDC at about 20 to 80 mils range. (Don't know the
exact mills for sure yet)

I'm an old geezer that had an associate in Electronics many decades ago, is
totally outdated, now.
Any help would be greatly appreciated.
Thanks in advance!  :-)

Ron------


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Before you do anyting automotive, read this.
http://www.littelfuse.com/data/en/Application_Notes/an9312.pdf

I'm not familiar with the numeric parameters associated with "nice smooth".

If you expect to get 10V out with ALL automotive conditions, you won't get there with a simple linear regulator, LDO or otherwise.

Whatever you do, make sure you have LOTS of transient protection on the input.

I always caution novice auto power supply designers to weigh the cost of the device they're powering against the money you save building your own
supply. Risking a $2K laptop on a $20 savings in power supply design
is false economy. YMMV.

There are also a bunch of other automotive considerations depending on
what you're trying to do. For example, I've never achieved a power suppy for my mp3 player that didn't have excessive ignition and alternator whine sneaking thru ground loops.

mike



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Relevant Pages

  • Re: Reducing Car 12VDC to 10VDC, I need help
    ... > Is there an IC that is made for car battery voltage reduction, ... > If I remember, a car system goes up to about 14.4 volts while charging, then ... > exact mills for sure yet) ...
    (sci.electronics.design)
  • Reducing Car 12VDC to 10VDC, I need help
    ... Is there an IC that is made for car battery voltage reduction, ... If I remember, a car system goes up to about 14.4 volts while charging, then ...
    (sci.electronics.design)
  • Re: Reducing Car 12VDC to 10VDC, I need help
    ... >Ron G wrote: ... >> Is there an IC that is made for car battery voltage reduction, ... a car system goes up to about 14.4 volts while ...
    (sci.electronics.design)
  • Re: Reducing Car 12VDC to 10VDC, I need help
    ... Ron G wrote: ... > Is there an IC that is made for car battery voltage reduction, ... a car system goes up to about 14.4 volts while ...
    (sci.electronics.design)
  • Re: Reducing Car 12VDC to 10VDC, I need help
    ... > Is there an IC that is made for car battery voltage reduction, ... > If I remember, a car system goes up to about 14.4 volts while charging, then ... > exact mills for sure yet) ...
    (sci.electronics.design)