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Old 12-03-2009, 05:12 AM #1
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Default Can I double up diodes on a single driver?

How about tripling up?

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Old 12-03-2009, 06:52 AM #2
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Default Re: Can I double up diodes on a single driver?

Simple answer = no.
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Old 12-03-2009, 06:59 AM #3
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Default Re: Can I double up diodes on a single driver?

Pretty much the only way I'd trust running laser diodes would be in series (all components of a series circuit see the same current, no matter what)

But you must be sure that all the diodes are 100% electrically isolated from each other.

Boost drivers will probably not like the huge increase in forward voltage drop, but simple drivers like the LM317 can handle voltages up to 35v.
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Old 12-03-2009, 10:29 AM #4
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Default Re: Can I double up diodes on a single driver?

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Originally Posted by MarioMaster View Post
Pretty much the only way I'd trust running laser diodes would be in series (all components of a series circuit see the same current, no matter what)

But you must be sure that all the diodes are 100% electrically isolated from each other.

Boost drivers will probably not like the huge increase in forward voltage drop, but simple drivers like the LM317 can handle voltages up to 35v.
I second this.

It can also be done in parallel if you connect a low ohm resistor in series with each diode (5-10 ohm-ish). The amp-draw adds with each diode in parallel, the voltage stays. Series is still the best way though.
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Old 12-03-2009, 08:37 PM #5
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Default Re: Can I double up diodes on a single driver?

Thank you men..
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Old 12-04-2009, 08:52 PM #6
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Default Re: Can I double up diodes on a single driver?

Do diodes die open most of the time or closed? I would be concerned about one diode dying and killing the other by taking on the full current.

Here is an link to a driver setup that is suposed to make doing this safer. I havn't read it yet but here you go.

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Old 12-04-2009, 09:45 PM #7
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Default Re: Can I double up diodes on a single driver?

Yeah... but in that schematic each LD has its own current limiting
resistor being driven by the 5 Volt fixed Voltage Regulator...

Jerry
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Old 12-05-2009, 11:30 AM #8
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Default Re: Can I double up diodes on a single driver?

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Originally Posted by sightfx View Post
Do diodes die open most of the time or closed? I would be concerned about one diode dying and killing the other by taking on the full current.

Here is an link to a driver setup that is suposed to make doing this safer. I havn't read it yet but here you go.

laserbias
Red and IR diodes die closed, violet diodes might be 50/50... If you want to double violet diodes I suggest connecting them in series if you can.
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Old 12-06-2009, 02:59 AM #9
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Default Re: Can I double up diodes on a single driver?

Quote:
Originally Posted by lasersbee View Post
Yeah... but in that schematic each LD has its own current limiting
resistor being driven by the 5 Volt fixed Voltage Regulator...

Jerry
So are you saying I should just use drivers?
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Old 12-06-2009, 04:36 AM #10
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Default Re: Can I double up diodes on a single driver?

Putting more than 1 diode on a driver is common over at PL for lab modules.

You just need to calculate a resistor to put on each diode.

Also, almost every time a diode dies, it dies close circuit, which means if anything it would draw more current and leave less for the other diodes. Failing open usually only happens from mechanical damage, or overpowering it by extreme amounts (A few amps)
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Old 12-06-2009, 12:23 PM #11
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Default Re: Can I double up diodes on a single driver?

Quote:
Originally Posted by Tech_Junkie View Post
So are you saying I should just use drivers?
I guess it depends on if you are trying to save money or Drivers
or Laser Diodes... (Potato.. Potaato)..

Jerry
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