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Old 12-09-2011, 04:21 PM #1
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Default Help with driver for 1W 808nm IR

Hi to everyone!!

I need your help, masters. Recently acquired a 1W 808nm IR LED and according to the specifications for optimum performance it is necessary to 2.2 Vout and 1.2 A. The problem is that I can not find a specific driver for this diode. Did you know where can I find it?

Thanks in advance.


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Old 12-09-2011, 05:13 PM #2
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Default Re: Help with driver for 1W 808nm IR

I like these.
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Old 12-09-2011, 05:46 PM #3
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Default Re: Help with driver for 1W 808nm IR

Thanks too much for quick reply.

But one question. Would not be then necessary exactly 2.2 v. out, right? I supposed there's no problem to break the diode.

Thanks again.
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Old 12-09-2011, 07:25 PM #4
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Default Re: Help with driver for 1W 808nm IR

It's a constant current driver. It will supply 900mA no matter the load (within reason)
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Old 12-09-2011, 11:49 PM #5
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Default Re: Help with driver for 1W 808nm IR

Be sure you have 808nm laser goggles. Visible lasers can really hurt you & IR is more dangerous.
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Old 12-11-2011, 06:36 AM #6
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Default Re: Help with driver for 1W 808nm IR

you know the 1W ir diodes are case positive too dont you?

i built a custom negative regulator driver that drives at 1.25A

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Old 12-11-2011, 03:06 PM #7
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Default Re: Help with driver for 1W 808nm IR

So is it an LED or a laser diode?

Fiddy: as I've said elsewhere, you can't just reverse the polarity and expect it to work. Additionally, you need much more voltage.
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Old 12-11-2011, 06:09 PM #8
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Default Re: Help with driver for 1W 808nm IR

Its a negative regulated LM317T not a positive.
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Old 12-11-2011, 06:41 PM #9
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Default Re: Help with driver for 1W 808nm IR

Hello again. And thanks to everybody!!

Cyparagon, I was not clear whether if the output voltage was a critical factor. But now I understand it is less important than a current (A). And thanks for de DX link. I think that this driver could work fine. But what do you think about this driver? Could work too? Link

HaloBlu, thanks for this information. Security is very important for me. A want to buy a good gogles. In this moment I have not intention to mount my own IR laser. I need more information before work with it.

Fiddy, thanks you too. This Scheme could be usefull for me in the future.
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Old 12-11-2011, 07:25 PM #10
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Default Re: Help with driver for 1W 808nm IR

Cyparagon, is a laser diode. Exactly this.
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Old 12-11-2011, 09:33 PM #11
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Default Re: Help with driver for 1W 808nm IR

Yes, that driver will work, too.

Quote:
Originally Posted by Fiddy View Post
Its a negative regulated LM317T not a positive.
I'm pretty sure the lm317 is a positive regulator by definition. You can put the whole thing after the load instead of before the load and it will have the same effect, but I am almost certain your schematic will not work.
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Old 12-12-2011, 04:06 AM #12
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Default Re: Help with driver for 1W 808nm IR

Quote:
Originally Posted by Cyparagon View Post
Yes, that driver will work, too.



I'm pretty sure the lm317 is a positive regulator by definition. You can put the whole thing after the load instead of before the load and it will have the same effect, but I am almost certain your schematic will not work.
well then, explain to me why hooked up how it is, it produces ~1A on the test load, and the laser lases?
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Old 12-12-2011, 04:58 AM #13
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Default Re: Help with driver for 1W 808nm IR

Which test load? If you're talking about 3 diodes and a 1ohm resistor, you could hook that up to a battery directly and probably get 1A.

Maybe there's a path straight through and the resistor is acting as a current limiting resistor. I seriously doubt you're getting any kind of regulation though.
I'll hook it up tomorrow and tell you more.
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Old 12-12-2011, 05:02 AM #14
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Default Re: Help with driver for 1W 808nm IR

oh wait its a LM337T not a LM317T sorry for the confusion if that's the point you are arguing?
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Old 12-12-2011, 05:25 AM #15
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Default Re: Help with driver for 1W 808nm IR






Yeah, that explains everything
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Old 12-12-2011, 05:26 AM #16
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Default Re: Help with driver for 1W 808nm IR

sorry for the confusion mate

Probs should of read your signature before looking reading what regulator i had :P
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Last edited by Fiddy; 12-12-2011 at 05:27 AM.
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