led driver circuit

I need some help with a circuit I need to drive 10 white leds from a 3.7v 2200mAh lipo battery it sounds simple but it has to be able to fit in a small container aproximity 1inch square and not produce a lot of heat, its for my son's night im making.

Any help is welcome

Thanks

Dave

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Robert Peter Oakes over 11 years ago +1

In this case I would be tempted to replace the 10 LEDs with a single 1 or 3W LED, it will fit easier and can be driven from the 3.7V LIPO with a simple constant current generator with minimal power loss…
jw0752 over 11 years ago in reply to terrenone +1

That sounds good Dave. The battery and charging question is resolved. Let me know how your testing of the 5mm LEDs go on the 3.7Volt source. Since you are going to be dealing with relatively low mA I do…
jw0752 over 11 years ago in reply to Robert Peter Oakes +1

Hi Peter - Whenever I try to answer one of these questions I am always pleased when one of the fellows, like yourself, with more knowledge and experience add their insight. I have come back to your recommendation…

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0 Robert Peter Oakes over 11 years ago

One of the things I have played with in the past is this

http://www.newark.com/texas-instruments/lm3410xnopb/ic-led-driver-constant-current/dp/75M6032

Requires minimal components and will do the job nicely running of a LIPO, read the PDF tech speck, there is an example circuit in there just what you need

Regards

Peter
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0 jw0752 over 11 years ago in reply to Robert Peter Oakes

Hi Peter,
I took your advice and got some of the LM3410 LED drivers to play around with. I set up the circuit and it worked perfectly. What a neat little IC. I always appreciate your wisdom. I also got some of the MCP6281 that Michael mentioned in his post. I will play with those next.
Thanks John
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0 Robert Peter Oakes over 11 years ago in reply to jw0752

I am only to happy to help and happy it is working out for you, they are certainly easy to use and have a minimal BOM to get up and running

show us what you build , could be of interest for others
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0 jw0752 over 11 years ago in reply to Robert Peter Oakes

Hi Peter,
Most of my builds are very simple and temporary. I find that I can read the data sheet and study the part in question but until I actually build a test circuit I am not sure I really understand what is going on. I will try to add some more pictures and diagrams to my posts in the future.
John
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0 jw0752 over 11 years ago in reply to Robert Peter Oakes

Hi Peter,
Most of my builds are very simple and temporary. I find that I can read the data sheet and study the part in question but until I actually build a test circuit I am not sure I really understand what is going on. I will try to add some more pictures and diagrams to my posts in the future.
John
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