Re: Best way to power array of LEDs?

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#245

From: Lizard Blizzard
Date: Tue, 08 Oct 2002 00:54

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Don Klipstein wrote:
> In article <anlb3a$lvte$1@hades.csu.net>, Lizard Blizzard wrote:
> 
>>budgie wrote:
>>
>><Snip>
>>
>>>In the auto situation, the simplest mitigation is to feed the
>>>resistor/LED chain thru an LM317 configured as a constant current
>>>source.  Just the IC and one resistor added, and no voltage variation
>>>issue.
>>
>>The LM317 has a minimum current which may be greater than a single LED 
>>can handle.  It will work good for a hundred mA or more.
> 
> 
>   In my experience, the LM317 (or maybe it's the LM317T) makes a decent
> 20 mA regulator.  I use one in my "handy-dandy-standard" LED tester.
> 
>  - Don Klipstein (don@misty.com)

But what's the minimum current?  I know for a voltage reg it's 5 mA. 
I've never experimented with the LM317 in current reg mode.

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From: Lizard Blizzard <NOSPAM@rsccd.org>
Newsgroups: sci.electronics.components,sci.electronics.design,alt.engineering.electrical,aus.electronics,sci.electronics.repair
Subject: Re: Best way to power array of LEDs?
Date: Mon, 07 Oct 2002 17:54:41 -0700
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