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ArcticMyst Security by Avery

Does this look useful?

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Allegro Microsystems - A6265, A6266, A6267 Press Release

Nov 28, 2011 - Allegro MicroSystems, Inc. announces the release of a new family of automotive-grade, high-current LED driver ICs with extensive diagnostics and protection features. The A6265, A6266 and A6267 are DC-DC converter controllers, with the A6265/A6267 configurable as either boost or buck-boost and the A6266 in boost only.

All provide a programmable constant current output for driving high power LEDs in series, ensuring identical currents and uniform brightness. The devices are capable of driving up to 15 LEDs at currents of 1 A or higher based on the external logic-level MOSFET. These devices are targeted for automotive and industrial LED driver applications, in particular exterior front and rear automotive lighting
 
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Useful? Not without a source and price. Even then, "automotive" suggests to me a 12V input requirement.
 
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A6265

Constant current LED drive
6.5 to 50*V supply
Boost or buck-boost modes
Drives between 2 and 10*LEDs in series
Programmable switching frequency 100 to 700*kHz
Open LED overvoltage indication and protection
Single and multiple LED short indication
LED short to ground and supply protection
PWM dimming control
10*µA shutdown current including LED leakage


Trying to find price and distribution now. It IS relatively new...

EDIT: Tom beat me to it. Seems like it would work with 2 Li-ions.
 
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There are tons of useful and appropriate DC-DC converter chips around that'll do what you want. What are lacking are designs incorporating them.
 
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There are tons of useful and appropriate DC-DC converter chips around that'll do what you want. What are lacking are designs incorporating them.

What interested me about this one was that it was a new chip and specifically designed for high current automotive LED lighting.

I have a lot of learning/re-learning to do on circuits, but it seems like they give you a lot of useful designs to et started on, maybe they aren't close enough to what we need to adapt hem easily.

My purpose though, was just to point this one out since it is relatively new (and as such, perhaps more "evolved" and nearer to what we are looking for out of the box. Maybe someone looking to design a new buck driver could find this chip useful and they might not have seen it.

Or, maybe it is just clutter and if so I apologize. :yh:

ALSO I noticed it is Grade 0 Automotive which has a higher op temp of 150C which seems desirable.
 
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Mar 29, 2011
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What interested me about this one was that it was a new chip and specifically designed for high current automotive LED lighting.

I have a lot of learning/re-learning to do on circuits, but it seems like they give you a lot of useful designs to et started on, maybe they aren't close enough to what we need to adapt hem easily.

My purpose though, was just to point this one out since it is relatively new (and as such, perhaps more "evolved" and nearer to what we are looking for out of the box. Maybe someone looking to design a new buck driver could find this chip useful and they might not have seen it.

Or, maybe it is just clutter and if so I apologize. :yh:

ALSO I noticed it is Grade 0 Automotive which has a higher op temp of 150C which seems desirable.

I was recently looking for something like this and I have missed these so it isn't useless post :beer: thanks
 




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