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Old 08-19-2016, 01:45 AM #1
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Default Can any Driver be Used for any Diode?

Hi,

Sorry if this is a noob question, but this may be a simple question with a simple answer but I cant seem to find the answer.

Ive been an electronics hobbyist for around 8 years (lasers for around 3 years) and have not actually messed around with constant current supplies


anyways,

As the title says, can any driver be used with any diode? I know that I would need to get a driver that supports the diodes normal operating voltage but some drivers dont say anything about voltage (just max voltage really, if anything).

Is that because constant current drivers ramp the voltage up until the diode starts lasing and then adjusts voltage until the set current draw is met?

And yes, I realized that I have built two lasers but the red just has a linear driver that specified use with a 650nm, and the other (blue) has a switching buck regulator which is really the one in question I guess.


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Old 08-19-2016, 02:01 AM #2
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Default Re: Can any Driver be Used for any Diode?

No!
Both the voltage and current must be right. Otherwise you are very likely to kill the diode.
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Old 08-19-2016, 03:29 AM #3
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Default Re: Can any Driver be Used for any Diode?

Quote:
Originally Posted by kuhny1 View Post
Hi,
As the title says, can any driver be used with any diode? I know that I would need to get a driver that supports the diodes normal operating voltage but some drivers dont say anything about voltage (just max voltage really, if anything).

Is that because constant current drivers ramp the voltage up until the diode starts lasing and then adjusts voltage until the set current draw is met?

And yes, I realized that I have built two lasers but the red just has a linear driver that specified use with a 650nm, and the other (blue) has a switching buck regulator which is really the one in question I guess.
Easy and simple solution--- get whatever diode, driver, module, and lens you want from DTR either assembled and tested together or as individual parts.
see: https://sites.google.com/site/dtrlpf/home/diodes

Even if you buy nothing from DTR you can study his diode site and learn what goes with what very quickly from what he offers. Just pick a diode and scroll down on the page.

Last edited by Encap; 08-19-2016 at 03:32 AM.
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Old 08-19-2016, 06:28 AM #4
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Default Re: Can any Driver be Used for any Diode?

Quote:
Originally Posted by kuhny1 View Post
Hi,

Sorry if this is a noob question, but this may be a simple question with a simple answer but I cant seem to find the answer.

Ive been an electronics hobbyist for around 8 years (lasers for around 3 years) and have not actually messed around with constant current supplies


anyways,

As the title says, can any driver be used with any diode? I know that I would need to get a driver that supports the diodes normal operating voltage but some drivers dont say anything about voltage (just max voltage really, if anything).

Is that because constant current drivers ramp the voltage up until the diode starts lasing and then adjusts voltage until the set current draw is met?

And yes, I realized that I have built two lasers but the red just has a linear driver that specified use with a 650nm, and the other (blue) has a switching buck regulator which is really the one in question I guess.
To answer your question, no you cannot use any driver with any diode.

Alot of people try to use LED flashlight drivers for laser diodes, which is feasible if it's a constant current driver. The issue is the LED drivers will be unreliable, usually have lots of noise and most aren't even constant current.

Most diodes have spec sheets somewhere online, and if they do not then the info is usually searchable online. DTR does have alot of tests of our most popular diodes on his website, but he lists a full range of currents and outputs you could choose from.

Bottom line, if you decide to start another build you need to either purchase as a package or do your research and buy the proper laser driver for the chosen laser diode. Don't spend 100$ on a diode/module package and 3$ on a LED driver and expect it to last (IE. SciFi Lasers)

Laser Diodes from what I can tell are not really all that voltage sensitive when it comes to output, what really changes the output is current. This does not mean you put whatever voltage you want through it, and hope for the best. You will need to still find a spec sheet and see what the max voltage is. Just remember when picking a diode/drive you have to account for the Vf (drop) and usually diodes like the 445nm M140s I have right now drop quite heavily; then you have to account for Vf of the driver... and ensure you have some V left after all that Vf to still keep your LD powered up for any amount of time!

Hope this helped.... if you have more questions i'll try to answer =o
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Old 08-19-2016, 12:36 PM #5
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Default Re: Can any Driver be Used for any Diode?

Quote:
Originally Posted by 94Z28 View Post
To answer your question, no you cannot use any driver with any diode.

Alot of people try to use LED flashlight drivers for laser diodes, which is feasible if it's a constant current driver. The issue is the LED drivers will be unreliable, usually have lots of noise and most aren't even constant current.

Most diodes have spec sheets somewhere online, and if they do not then the info is usually searchable online. DTR does have alot of tests of our most popular diodes on his website, but he lists a full range of currents and outputs you could choose from.

Bottom line, if you decide to start another build you need to either purchase as a package or do your research and buy the proper laser driver for the chosen laser diode. Don't spend 100$ on a diode/module package and 3$ on a LED driver and expect it to last (IE. SciFi Lasers)

Laser Diodes from what I can tell are not really all that voltage sensitive when it comes to output, what really changes the output is current. This does not mean you put whatever voltage you want through it, and hope for the best. You will need to still find a spec sheet and see what the max voltage is. Just remember when picking a diode/drive you have to account for the Vf (drop) and usually diodes like the 445nm M140s I have right now drop quite heavily; then you have to account for Vf of the driver... and ensure you have some V left after all that Vf to still keep your LD powered up for any amount of time!

Hope this helped.... if you have more questions i'll try to answer =o
Thanks for the reply!

Heres my 1 watt setup:

The diode is a NDB7412T (datasheet)
The driver is a Fixed Current Switching Supply set to 1A (here)

Did I pick my diode and my driver right? As in, will it have a decent life on it?
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Old 08-19-2016, 03:13 PM #6
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Default Re: Can any Driver be Used for any Diode?

Quote:
Originally Posted by kuhny1 View Post
Thanks for the reply!

Heres my 1 watt setup:

The diode is a NDB7412T (datasheet)
The driver is a Fixed Current Switching Supply set to 1A (here)

Did I pick my diode and my driver right? As in, will it have a decent life on it?

Yes, that should work fine, and you've picked a driver lower than the diodes rated current so it should last for ages.
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Old 08-19-2016, 04:01 PM #7
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Default Re: Can any Driver be Used for any Diode?

Hopefully you're familiar with constant voltage supplies. The voltage is held constant, provided the load is within a certain range of currents.

Constant current supplies operate the same way, but flipped. The current is held constant, provided the load is within a certain range of voltages. This range of acceptable output voltages depends on driver and the voltage provided to the driver.
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Old 08-19-2016, 04:16 PM #8
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Default Re: Can any Driver be Used for any Diode?

Quote:
Originally Posted by kuhny1 View Post
Thanks for the reply!

Heres my 1 watt setup:

The diode is a NDB7412T (datasheet)
The driver is a Fixed Current Switching Supply set to 1A (here)

Did I pick my diode and my driver right? As in, will it have a decent life on it?
Should work fine.. looks like that's the current Nichia ran it at, and most thr PJs are rated at 50k hours. Which means should be stable and last long time!

I like to push my diodes a bit to get that extra power
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Old 08-20-2016, 02:06 AM #9
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Default Re: Can any Driver be Used for any Diode?

Nice! Thanks for your reply's
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