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Old 12-29-2010, 05:28 PM #1
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Default LM317 based driver for 1W 445

Okay guys so I ordered my 1W 445 diode last night. I plan on using an LM317 driver for it based on the photo. Obviously I will need a lower resistor to get the 1000 mW of power. My question is this, Is the capacitor shown and the diode okay to use in this circuit for the 1W 445 diode? My input voltage will be from a PSU from a computer. The 12 volt yellow wire.
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LM317 based driver for 1W 445-lm317bluray.jpg  


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Old 12-29-2010, 05:32 PM #2
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Default Re: LM317 based driver for 1W 445

Your driver will get very hot using 12 volts! It will have to dump the extra voltage as heat, and I suggest You find an alternative power source.

My 0.02
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Old 12-29-2010, 05:48 PM #3
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Default Re: LM317 based driver for 1W 445

a 9V is perfect for the lm317 but it will drain too fast with a 445
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Old 12-29-2010, 06:05 PM #4
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Default Re: LM317 based driver for 1W 445

Thanks guys. What is the required voltage of the 445 diode? Any other driver suggestions? I really want to use the computer PSU. What if I screwed the LM317 to a larger heatsink with thermal paste?
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Old 12-29-2010, 06:14 PM #5
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Default Re: LM317 based driver for 1W 445

A heatsink is recommended. You need 2.5 volts of the operating voltage of the diode with a LM317 based driver. If memory is working at the moment 445's need 4.5v, so that you will need at least 7 volts with a LM317.
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Old 12-29-2010, 06:20 PM #6
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Default Re: LM317 based driver for 1W 445

I use a 7.4v 850mah LiPo RC battery with mine, which works just fine and with a decent run time.

I also use a .5 ohm 1watt resistor.

All of my other components are as standard in your diagram.

You will need decent heatsinking on both your LM317 & diode.

At these currents things get hot quickly! And so does anything that gets in the way of the beam

Good luck with your build.
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Old 12-29-2010, 06:23 PM #7
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Default Re: LM317 based driver for 1W 445

Just a little bit higher ..... 2.5V from IC dropout, plus 1.25V from Rset dropout for the LM317 ..... or 1.35V from the IC plus 1.25V from the Rset for a LM1117. (plus a little bit, say, half volt, for safety), if you want the full current capability (and a good heatsink)

So, 8.75 to 9 V for an LM317, or around 8V for an LM1117.
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Old 12-29-2010, 06:28 PM #8
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Default Re: LM317 based driver for 1W 445

Ooohh good catch I spaced the 1.25v Rset. I'll have to give you some Rep for that.

I did say at least...LOL
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Old 12-29-2010, 10:07 PM #9
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Default Re: LM317 based driver for 1W 445

I drive a 445 with 12V and lm317. I use a 3.3Ω 6W power resistor (from the junk pile) to drop ~3V which saves the lm317 from a lot of heat. It still needs a heat sink, but it is much smaller.
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Old 12-29-2010, 10:33 PM #10
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Default Re: LM317 based driver for 1W 445

Thanks all. So if my calculations are correct, I would need a 1.38 ohm resistor in order to push the 445 diode 900 mA of current?? Or would it be safe to use a 1 ohm resistor of higher wattage? You know the square white resistors.
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Old 12-30-2010, 03:14 AM #11
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Default Re: LM317 based driver for 1W 445

Anyone?
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Old 12-30-2010, 04:14 AM #12
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Default Re: LM317 based driver for 1W 445

Try this link to help figure out Your resistor values

LM317 Current Calculator - Electric Circuit
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Old 01-02-2011, 09:15 PM #13
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Default Re: LM317 based driver for 1W 445

Quote:
Or would it be safe to use a 1 ohm resistor of higher wattage? You know the square white resistors.
That should work just fine.
Just don't do as I did, using a 0Ohm "bypass", feeding 1.95Amps to the poor little diode.
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Old 01-02-2011, 11:10 PM #14
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Default Re: LM317 based driver for 1W 445

Yea I am currently using a 1 ohm 5 watt resistor in series with two 0.47 ohm resistors that are in parallel. During my tests, output remained a stable .99 amps. I do have the LM317 well heatsinked and am using 12 volts in. Now I just need to hurry up to wait on my 445 diode.
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Old 01-05-2011, 07:21 PM #15
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Default Re: LM317 based driver for 1W 445

You could always use the 12V as your plus and the 3.3V as your -
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Old 05-31-2011, 01:10 AM #16
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Default Re: LM317 based driver for 1W 445

hi guys, a quick question, is it ok to connect the tab on the lm317 to the same heatsink than the 445 diode?, I was checking the diode and looks like isulated from the case, is that correct?

quick answer apreciatted, I'm setting up a quick lab for my diode just now, by the way, which driver with modulation and cheap could you recommend for a 7-13v range power?
thanks very much
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