From: Jim Yanik
Subject: Re: Driving an LED from 9v battery
Date: Thu, 21 Nov 2002 16:19:59 +0000 (UTC)
Organization: Friends of Lummox
NNTP-Posting-Date: Thu, 21 Nov 2002 16:19:59 +0000 (UTC)
"Walter Harley" wrote in
> "Da Man" wrote in message
>> Zetex has a fairly new high efficiency switchmode LED driver that
>> this, but I think it only handles about 8V max. It's in a small SMT
>> and needs a inductor, resistor, and a transistor. It will also run
>> down to around 0.8V.
>> If that is acceptable and you have trouble finding it, let me know
>> look it up.
> I'd be interested in a pointer just because maybe the datasheet will
> give me some ideas, but off the cuff it sounds like not quite the
> right thing. I don't need to go below 6v, but I do need to go higher.
> Obviously with a bit more engineering I could get this one to work,
> but I'd rather just start out with something more appropriate.
> Thanks for the lead on Zetex, though; they wouldn't have occurred to
Zetex,Linear Technology,Maxim,all have LED driver IC's,there's a wide
choice. Search each site for LED driver IC and you will get some nice
comparison lists.Their app sheets give several circuits ,even list part
numbers for the caps,resistors,and inductors.
Jim Yanik,NRA member
remove X to contact me