I need a 1.7 vdc 60 amp constant current diode driver...anyone have one laying

Lasers
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1

I need a 1.7 vdc 60 amp constant current diode driver…anyone have one laying around or know where to get one?

2

Are you the user that asked @raykholo for such?

It was an intriguing problem so did some research on this when he asked me and I found nothing close to this level of current capacity.

You may know, laser diode drivers are more complex than folks realize as they can easily fry the diode in u-secs with transients, the diodes are expensive fuses. They need close current regulation and soft start functions.

I concluded that the best approach might be to get a standard LD drive (that has all the power control stuff) and add a high current MOSFET output stage that can handle 60 amps. My guess is that you probably also want PWM control?

Why 60 amps?

3

The 50 watt yag diode puts out 50 watts @ 60 amps.

4

I can run it now but my driver only has 35 amps of output current @ 1.7 vdc.

5

@Scott_Thorne Gulp! that’t a gagle whew!

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Can you point me to the 35 amp one?
Schematic would be ideal.

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I’ll try and find you a schematic…it didnt come with one but the model is SDL8110B

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Update: whoops this is not the SDL8110B
ignore below. Although this site is interesting

http://redlum.xohp.pagesperso-orange.fr/electronics/SDL800.html

http://redlum.xohp.pagesperso-orange.fr/electronics/data/ldi800.man.pdf

9

I have 3 of these too

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I think these are good for around 2 amps…lol

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Hey Don if you can make one of these work…I’ll send you 2 of them.

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@Scott_Thorne you mean the sdl800?

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Yes…i have 3 of them

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@Scott_Thorne I took a quick look at the design of the SDL800, if I read it all correct, the diode is run with the anode at ground and the cathode at V. That makes the beefier power supply more complex to build/buy and I don’t like () supplies if they are not needed.

Do you know if this is normal for high power diodes to be run that way. My 2 watt does not.

Do you have specs on your diode?

What are you going to do with this setup?

I stumbled on this one that can be modulated:

…
Although the SDL800 has a lot of useful features I judge it would be easier to add a stage to a cheap drive like.

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I looked at the one you posted and it only goes down to 3 volts…I’ll send you the info on my diode when i get off