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Old 12-24-2012, 05:42 AM #1
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Default Help with LM317 Driver for 1W 808nm Diode

Hi,

Ive been looking all over, and through other forum posts, but nowhere is giving me the direct information i need.

I want to construct a LM317 regulator circuit for my 1W 808nm laser diodes. I was particularly hoping to have the regulator fit inside the laser housing.

My problem is, i dont know what input voltage to provide, i have 2W 1Ohm resistors on their way, so the regulator will put out 1.25A, the recomended operating current for my diodes. I want to make sure i have the right voltage to prevent too much heat being dissipated by the regulator, as the diode and regulator will share the same heatsink housing.

Also, as i am planning on building some things requiring a burning laser to run off batteries and it wont have enough room for a regulator, just a single resistor, how do i go about working out the correct resistance to use?
I have a 3V cr123A battery which i want to use to power a 1W 808nm Laser diode which needs 2.2v, i need a current of 1-1.25A.
Also, i have 2x 1.2V NIMH batteries i will use in series, what resistance do i need for them?

Im not sure exactly how voltage drop comes into all this, when calculating desired resistance.

Lastly,
Ive been planning for a while to sell drivers built into my laser modules, which are essentially just diodes in focuseable housings. Does anyone know a driver design that would fit inside a to-5 laser housing?
I was planning on building the LM317 driver as i could get one chi[p and the resistor, pls perhaps a capacitor inside the housing, but again, i dont know exactly how the voltage drop and amount of heat dissipated works into this.

Thanks


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Old 12-24-2012, 06:15 AM #2
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Default Re: Help with LM317 Driver for 1W 808nm Diode

hey man,

Is this going inside a host? and is your diode case positive?

If so you have a problem with using a LM317.
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Old 12-24-2012, 04:30 PM #3
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Default Re: Help with LM317 Driver for 1W 808nm Diode

^nonsense. You can put the LM317 on the other side of the load - It doesn't care.
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Old 12-24-2012, 11:05 PM #4
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Default Re: Help with LM317 Driver for 1W 808nm Diode

^ OUTRAGEOUS! you certainly cant with a case positive diode unless you isolate the diode from the case.
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Old 12-25-2012, 01:01 AM #5
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Default Re: Help with LM317 Driver for 1W 808nm Diode

Maybe you missed the part where I said "other side of the load," but I'll draw it out for you (and others) anyway:

Attached Thumbnails
Help with LM317 Driver for 1W 808nm Diode-lm317-after-load.png  
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Old 12-25-2012, 05:40 AM #6
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Default Re: Help with LM317 Driver for 1W 808nm Diode

__________________
405nm - 1,910mW (6)
445nm - 15,895mW (15)
450nm - 370mW (2)
473nm - 110mW (2)
532nm - 1250mW (6)
632.8nm - 2mW (1)
637nm - 5105mW (8)
660nm - 1,850mW (5)
670nm - 600mW (1)
685nm - 40mW (1)
808nm - 2,700mW (3)
RGB - 400mW (1)

In Progress:
405nm - 500mW+ Kryton Groove
445nm - 2,000mW+ C-88
520nm - 50mW Ultrafire RL-118 SS
632.8nm - 0.5mW Mini HeNe

Safety Glasses
2x Eagle Pair OD4+ 190nm-540nm
2x Eagle Pair OD4+ 90-400nm & 580-760nm
OEM Lasers OD 5+ 190-435nm & 730-1085nm

LaserBee 5W Laser Power Meter


>Fiddy's Review/Tutorial/Build Compilation Thread<
>>FS: Custom Glow Rings<<
>>>Plasma Speaker Kits (High Frequency Audio Tesla Coil) reserve yours today!<<<

CajunLasers FTW!
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