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Old 05-18-2013, 06:12 PM #1
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Exclamation M140 diode broken ? or wrong driving method ?

Hi, so there is my problem I bought a m140 2w diode, made a home driver to drive the laser diode with 0.45A and 3.5V but the diode doesn't lighting powerful like in videos or more... So why my diode is lighting so low, I don't think that it's broken because I watched out for static electricity ... can someone help me ?

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Old 05-18-2013, 06:32 PM #2
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Default Re: M140 diode broken ? or wrong driving method ?

Your diode needs ~5V

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Old 05-18-2013, 06:37 PM #3
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Default Re: M140 diode broken ? or wrong driving method ?

I will try thank you very much
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Old 05-18-2013, 06:42 PM #4
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Default Re: M140 diode broken ? or wrong driving method ?

You also need to heat sink that module
Your diode is going to heat up pretty fast with just the module to carry the heat
That heat will stress your diodes fairly quickly

Otherwise, keep to VERY short duty cycles

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Last edited by daguin; 05-18-2013 at 06:42 PM.
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Old 05-19-2013, 03:18 PM #5
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Default Re: M140 diode broken ? or wrong driving method ?

I have already a heatsink but it's small I'll replace it by a bigger one

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Old 05-19-2013, 09:07 PM #6
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Default Re: M140 diode broken ? or wrong driving method ?

Forward Voltage should be at least 4,6V-4,8V for the M140 regardless the current
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Old 05-20-2013, 01:50 PM #7
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Default Re: M140 diode broken ? or wrong driving method ?

yeah the diodes voltage is 4.8V I'll play with the current now
what's the max current the m140 can support with 4.8 V ?

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Old 05-20-2013, 01:55 PM #8
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Default Re: M140 diode broken ? or wrong driving method ?

They can usually take upwards of 1.8A. But to be safe (especially for someone new - trust me, it sucks when your first build dies), you could stick around 1-1.4A and still get some sweet burning power.

As its your first build, you'll be awed regardless of whether you have 800mW or 2W. It'll all look the same. Also - be careful with your eyes!
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Old 05-20-2013, 02:09 PM #9
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Default Re: M140 diode broken ? or wrong driving method ?

thanks for the reps guys !
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Old 05-21-2013, 04:14 PM #10
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Default Re: M140 diode broken ? or wrong driving method ?

it is dangerous to run the diode at 5.5V ?
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Old 05-21-2013, 04:22 PM #11
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Default Re: M140 diode broken ? or wrong driving method ?

The current matters if you drive the diode at 5,5V with a constant current source like a driver at let's say at 1,8A the driver will automatically adjust the forward voltage to exactly the value the diode needs at that current you could even put something like 7V on it doesn't matter on a constant current source !
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Old 05-21-2013, 04:49 PM #12
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Default Re: M140 diode broken ? or wrong driving method ?

Thanks guys for everything

[IMG][/IMG]

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