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'[EE] LED driver from I2C'
2008\04\09@105833 by David VanHorn

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Can anyone out there point me to an efficient solution for driving a
couple of 1A IRLEDs from a 7-12V source, with I2C control?

I can do it with a small micro to provide PWM into a conventional
boost reg set as a constant current source, but that seems like a lot
of messing about for something that should be a one-chip solution.

Unfortunately, I'm just not finding it.

2008\04\09@120659 by Alan B. Pearce

face picon face
>Can anyone out there point me to an efficient solution for driving a
>couple of 1A IRLEDs from a 7-12V source, with I2C control?
>
>I can do it with a small micro to provide PWM into a conventional
>boost reg set as a constant current source, but that seems like a lot
>of messing about for something that should be a one-chip solution.

Dare I say it, but (whisper) Maxim (/whisper) probably have a suitable chip.
They have all sorts of LED control stuff, much aimed at cell phones, but
they do stuff for larger LEDs too.

2008\04\09@122241 by Bob Axtell

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Alan B. Pearce wrote:
>> Can anyone out there point me to an efficient solution for driving a
>> couple of 1A IRLEDs from a 7-12V source, with I2C control?
>>
>> I can do it with a small micro to provide PWM into a conventional
>> boost reg set as a constant current source, but that seems like a lot
>> of messing about for something that should be a one-chip solution.
>>    
>
> Dare I say it, but (whisper) Maxim (/whisper) probably have a suitable chip.
> They have all sorts of LED control stuff, much aimed at cell phones, but
> they do stuff for larger LEDs too.
>
>  
That's OK, Alan, you can speak up. Even _I_ buy from them sometimes. My
client is buying batches
of DS1822-PAR as we speak.

--Bob Axtell

2008\04\09@124626 by David VanHorn

picon face
> Dare I say it, but (whisper) Maxim (/whisper) probably have a suitable chip.
> They have all sorts of LED control stuff, much aimed at cell phones, but
> they do stuff for larger LEDs too.

Oh.. Them..

Yeah, I should probably have a look, I only need a few hundred this year.
I then have time to redesign. :)

I keep running into exclusives, either they have the current out, OR
they have operation from better than 10V, but not both, and damned few
have I2C to start with.

2008\04\09@140134 by David VanHorn

picon face
> Oh.. Them..

So much for that. Even MAX can't fill my need.

2008\04\09@142527 by Dario Greggio

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Alan B. Pearce wrote:

> Dare I say it, but (whisper) Maxim (/whisper) probably have a suitable chip.
> They have all sorts of LED control stuff, much aimed at cell phones, but
> they do stuff for larger LEDs too.

Agreed on this all :))


--
Ciao, Dario -- ADPM Synthesis sas -- http://www.adpm.tk

2008\04\09@183631 by Dario Greggio

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just saw this one
<http://newsletter.eetimes.com/cgi-bin4/DM/y/hBIIa0GlQHk0OMp0FxXO0EO>

not suited though :)

2008\04\09@192558 by David VanHorn

picon face
It's proven surprisingly difficult.. I think in the end, I'll use a
quad dpot on I2C (I need four channels) and just use conventional CCS
SMPS drivers.

Oh well..

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