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Old 11-28-2010, 08:40 AM #1
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Question LM317 for 445nm laser

Hello guys. I'm planning a new 445nm build and I don't wont to put money on a driver. I want to use an LM317 driver with an 1ohm 2 watt resistor. I don't want to power my laser from a pc's power supply because it is not stable and I have destroyed 2 445nm diodes in the past with this power supply. So what batteries can I use to power my laser? Can I use 2x 18650 batteries at 2500ma each (3.7 volt 4.2 full) or it will be two much and will destroy my diode???


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Old 11-28-2010, 04:49 PM #2
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Default Re: LM317 for 445nm laser

Yeah, that will work fine. Remember to heat sink the lm317.
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Old 11-28-2010, 04:53 PM #3
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Default Re: LM317 for 445nm laser

thanks...I'll test it...
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Old 11-28-2010, 04:56 PM #4
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Default Re: LM317 for 445nm laser

You've destroyed two 445 diodes with a faulty power supply, but you don't want to spend money on a proper driver?

*does not compute*
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Old 11-28-2010, 05:01 PM #5
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Default Re: LM317 for 445nm laser

You are kinda right. I'll think about it
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Old 11-29-2010, 02:21 PM #6
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Default Re: LM317 for 445nm laser

The lm317 IS a propper driver, Mr. deluminati.
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Old 11-29-2010, 04:19 PM #7
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Default Re: LM317 for 445nm laser

Quote:
Originally Posted by Cyparagon View Post
The lm317 IS a propper driver, Mr. deluminati.
Was referring to the computer power supply, Dr.Cyparagon.

Can one split the load between two LM317's to keep the heat down?

Last edited by deluminati; 11-29-2010 at 05:18 PM.
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Old 11-29-2010, 05:55 PM #8
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Default Re: LM317 for 445nm laser

Yes, you can run 2 LM317s in parallel with each set at half your desired current.
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Old 11-29-2010, 05:58 PM #9
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Default Re: LM317 for 445nm laser

Or use the LM338. The beef-up version of the LM317. I don't know about the heat dissipation.
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Old 11-29-2010, 06:30 PM #10
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Default Re: LM317 for 445nm laser

What kind of filtering caps are you using on your LM 317 because a computer supply should be fine as long as the LM317 has some caps on the input and output. Also if you need more current you can use a lt1083

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Old 11-29-2010, 06:36 PM #11
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Default Re: LM317 for 445nm laser

^1.2A is within the LM317's limits. There's no reason to spend $15 when a $2 chip will suffice.

The lm338 would give off the same amount of heat as an lm317. Two lm317s in parallel would give off the same amount of heat as one lm317. If you use two lm317 in parallel, you only double the area the heat can be emitted while a heat sink can increase surface area 20 times or more. Adding a heat sink is simpler, more effective, and likely cheaper.
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Last edited by Cyparagon; 11-29-2010 at 06:39 PM.
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Old 11-29-2010, 06:50 PM #12
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Default Re: LM317 for 445nm laser

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Originally Posted by Cyparagon View Post
^1.2A is within the LM317's limits. There's no reason to spend $15 when a $2 chip will suffice.

The lm338 would give off the same amount of heat as an lm317. Two lm317s in parallel would give off the same amount of heat as one lm317. If you use two lm317 in parallel, you only double the area the heat can be emitted while a heat sink can increase surface area 20 times or more. Adding a heat sink is simpler, more effective, and likely cheaper.
Exactly; You will end up with the exact same amount of waste heat. The LM317 is rated to handle up to 125C. With that being said, I've stress tested for 12 hour cycles at ~105C with no degradation. The LM317 also has thermal shutdown protection; I've tested it, it works (the device simply stops delivering current until the temp reduces to proper operating levels). Unless you're looking for really long duty cycles don't waste too much time here; just sink it and call it good.
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Old 11-29-2010, 07:41 PM #13
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Default Re: LM317 for 445nm laser

Hey guys I have a good heatsink for my Lm317 but I don't want the pc'c power supply. It has a kind of problem and it hasn't stable power so it burns my lasers..I have destroyed 2 445nm and one 405nm laser. I may use an adaptor.. So if I connect 3 18650 batteries the voltage will be at 12.6 volt. Will the Lm317 give me 4.5 volts at 1 amp or more to kill my diode?
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Old 11-29-2010, 09:01 PM #14
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Default Re: LM317 for 445nm laser

The LM317 will give you current at a set amount and should not kill your diode. If set up properly with filter caps the power supply should not matter. Personally I would go 2 18650s because there will be less for the regulator to dropout and convert into heat.
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Old 11-29-2010, 10:01 PM #15
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Default Re: LM317 for 445nm laser

I use a 7 volt 1 amp router wall adapter with the lm317 on most of my builds. The lm317 heats up a bit when used with red diodes.
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Old 11-29-2010, 10:57 PM #16
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Default Re: LM317 for 445nm laser

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The LM317 will give you current at a set amount and should not kill your diode. If set up properly with filter caps the power supply should not matter. Personally I would go 2 18650s because there will be less for the regulator to dropout and convert into heat.
What he said. Two 18650s is perfect for this build; Even at their lowest charge state they will produce slightly more voltage than you need.

If you use the third battery you are going to be making considerably more heat since the LM317 has to dissipate any extra/unused voltage. On top of that, your battery life is probably not going to increase (much).
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