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Old 10-17-2013, 09:05 PM #1
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Default 1.8 Ampere Driver (~9Vin)

So I want to build a DDL/LM317 style current driver for a M140 laser diode, but the LM317 build only goes up to 1.5 Amperes

I want to find out how to build a 1.8A current driver that can use 9V....any help I will be thankful for


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Old 10-18-2013, 04:55 AM #2
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Default Re: 1.8 Ampere Driver (~9Vin)

Kind of redundant since your last thread mentions you have decided to use the L200 driver.


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As for the driver...
I saw that the LM317 Constant Current Driver was good for outputs up to 1.5A. This diode requires an amperage of 1.2A-1.8A, so the LM317 will be no good for this diode (I know you can set up the regulator with a heatsink, but I prefer not to :3).
If you want to run your m140 above 1A and you're preferring not to heatsink it, the driver would always overheat and either the thermal shutdown will occur or your whole laser will start blinking within seconds after turning it on..

My advice, Save yourself trouble and get the diode with a pre-installed X-Drive if you havent ordered yet, otherwise order a new buck driver..

If not, the better alternative to it would be LM1085/1084 if you can get one , use 0.7Ohm resistor and 16v 10up caps on input and output , make it like a ddl , Do heatsink it otherwise read the above once again..
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Old 10-18-2013, 07:20 AM #3
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Default Re: 1.8 Ampere Driver (~9Vin)

You won't be running any linear driver at 1.8A without heatsinking, that's for sure.
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Old 10-18-2013, 06:02 PM #4
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Default Re: 1.8 Ampere Driver (~9Vin)

I know that the L200 is a possibility, but I've also heard that you can set up the LM317 in parallel with another LM317. I could not find any more information about doing this...

As for the L200 voltage regulator, it is simply too complicated to impliment a viable circuit just to regulate the current. The regulator has too many capabilities and ends up being a waste of time.

but yeah, im currently (haha) trying to figure out that two LM317 parallel circuit right now



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Originally Posted by sinner View Post
Kind of redundant since your last thread mentions you have decided to use the L200 driver.




If you want to run your m140 above 1A and you're preferring not to heatsink it, the driver would always overheat and either the thermal shutdown will occur or your whole laser will start blinking within seconds after turning it on..

My advice, Save yourself trouble and get the diode with a pre-installed X-Drive if you havent ordered yet, otherwise order a new buck driver..

If not, the better alternative to it would be LM1085/1084 if you can get one , use 0.7Ohm resistor and 16v 10up caps on input and output , make it like a ddl , Do heatsink it otherwise read the above once again..
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Old 10-18-2013, 07:39 PM #5
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Default Re: 1.8 Ampere Driver (~9Vin)

Check out the LM350 instead, you will still need heatsinking
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Old 10-18-2013, 07:51 PM #6
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Default Re: 1.8 Ampere Driver (~9Vin)

Awh I really dont want to mess with a heatsink for the regulator. How small can they be?
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Old 10-18-2013, 08:47 PM #7
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Default Re: 1.8 Ampere Driver (~9Vin)

Assuming your supply voltage of 9v and a diode forward voltage of 4.25v, the regulator will be dissipating 8.55W of heat to run the diode at 1.8A.

With no heatsinking the regulator will quickly reach thermal shutdown temperature and your laser will dim/flash as the regulator protects itself from turning into a mess of burnt plastic and silicon. No heatsink is probably doable at 1W, but at 8.55W not even close
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Old 10-19-2013, 03:42 AM #8
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Default Re: 1.8 Ampere Driver (~9Vin)

anyone know if parrallel 317's would work?
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Old 10-19-2013, 05:18 AM #9
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Default Re: 1.8 Ampere Driver (~9Vin)

Yes. Each should have its own series resistor.
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Old 10-19-2013, 11:08 PM #10
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Default Re: 1.8 Ampere Driver (~9Vin)

Quote:
Originally Posted by SKeeZ View Post
anyone know if parrallel 317's would work?
yep, here it is with the output of 2.301A








and this one dialed in at 1.755A


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Old 10-19-2013, 11:49 PM #11
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Default Re: 1.8 Ampere Driver (~9Vin)

Don't forget to add a capacitor across the diode or you'll be blowing diodes.
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Old 10-19-2013, 11:55 PM #12
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Default Re: 1.8 Ampere Driver (~9Vin)

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Don't forget to add a capacitor across the diode or you'll be blowing diodes.
How do I know how much capacitance I need?
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Old 10-20-2013, 12:00 AM #13
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Default Re: 1.8 Ampere Driver (~9Vin)

The drivers I've seen use around 10μF per amp of output.
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Old 10-20-2013, 12:57 AM #14
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Default Re: 1.8 Ampere Driver (~9Vin)

so if they are in parallel does it make a difference?
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Old 10-20-2013, 01:02 AM #15
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Default Re: 1.8 Ampere Driver (~9Vin)

No. I would round up to the nearest amp. So say you're running at 1300mA total. I would go with 20μF.
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