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Old 10-14-2011, 02:21 AM   #1
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Default 635nm 300mw-500mw Laser Diode Driver

Anyone use this driver for the new Mitsubishi diodes? 635nm 300mw-500mw Laser Diode Driver
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Old 10-14-2011, 04:20 AM   #2
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Default Re: 635nm 300mw-500mw Laser Diode Driver

I've bought from qualifound and they are good folks to deal with, but personally I would not use that driver.

I just did not like the way the specs read: IE, it's pretty large in size and might be difficult to make room for in a handheld, and I didn't like the explaination for this: constant current at 6.5V input, but later states recommended voltage to be 3.7V, so what's the current at a 3.7V input?

Then again, I'm not an electronics engineer or even a tech, and it might be perfectly acceptable to the other members here.

Last edited by mark-in-dallas; 10-14-2011 at 12:33 PM.
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Old 10-14-2011, 12:27 PM   #3
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Default Re: 635nm 300mw-500mw Laser Diode Driver

It is... a bit big, but looks like a buck driver to me.
BTW, nice avatar, Mark.
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Old 10-14-2011, 03:43 PM   #4
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Default Re: 635nm 300mw-500mw Laser Diode Driver

^based on what?
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Old 10-14-2011, 04:09 PM   #5
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Default Re: 635nm 300mw-500mw Laser Diode Driver

8-pin IC: check.
big transistor: check.
big schottky: check.
three caps: check.
potentiometer paralleled with a smaller resistor: check.
OVP zener + resistor: check.
6.5V input: check.
poorly designed driver board: check.

diagnosis: a cheap chinese buck driver.
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Fenzir: So why is it that we want these kind of diodes? I don't understand.
anselm: Because they emit coherent light, that's why....
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Old 10-14-2011, 04:40 PM   #6
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Default Re: 635nm 300mw-500mw Laser Diode Driver

Dont buck drivers need inductors?
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Old 10-14-2011, 04:55 PM   #7
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Default Re: 635nm 300mw-500mw Laser Diode Driver

I'm pretty sure the inductor is that big white resistor looking thing... The way it is connected corresponds to it.
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Fenzir: So why is it that we want these kind of diodes? I don't understand.
anselm: Because they emit coherent light, that's why....
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Old 10-14-2011, 06:09 PM   #8
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Default Re: 635nm 300mw-500mw Laser Diode Driver

lm 317 driver ftw
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Old 10-14-2011, 07:15 PM   #9
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Default Re: 635nm 300mw-500mw Laser Diode Driver

Quote:
Originally Posted by Johnyz View Post
I'm pretty sure the inductor is that big white resistor looking thing... The way it is connected corresponds to it.
That big white thing is a Resistor Flip Upside down.

If you scroll up to the main Picture next to the Price you can see it.
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Old 10-14-2011, 08:15 PM   #10
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Default Re: 635nm 300mw-500mw Laser Diode Driver

1R0 could mean 1uH... there are inductors made in 1206 or 0805... But even if it's not a coil, that would mean it's some weird design and not a switched one... But why the schottky and transistor then?
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Quote:
Fenzir: So why is it that we want these kind of diodes? I don't understand.
anselm: Because they emit coherent light, that's why....
405nm 20mW DealExtreme pointer
445nm 1W Hotlights with CUSTOM BOOST driver
532nm 50mW DealExtreme SDLaser 301 with key, up to spec when IR-filtered!
532nm 400mW DinoDirect Firedragon III "Certified Power Guaranteed" 500mW peak!

632nm 8mW Tesla 30 year old HeNe made in Czechoslovakia
637nm 400mW WF-501b yellow anodized and CUSTOM BUCK driver
685nm 35mW diode in Jayrob pen host

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Old 10-15-2011, 07:05 AM   #11
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Default Re: 635nm 300mw-500mw Laser Diode Driver

Yup, it doesnt look like any buck driver ive ever seen?
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Old 10-17-2011, 11:55 AM   #12
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Default Re: 635nm 300mw-500mw Laser Diode Driver

Seems like we have a couple of options here.
  • Weird switched design that doesn't have an inductor
  • The inductor is hidden somewhere (the big "resistor"?)
  • Weird ULDO linear design that uses schottky and transistor
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Quote:
Fenzir: So why is it that we want these kind of diodes? I don't understand.
anselm: Because they emit coherent light, that's why....
405nm 20mW DealExtreme pointer
445nm 1W Hotlights with CUSTOM BOOST driver
532nm 50mW DealExtreme SDLaser 301 with key, up to spec when IR-filtered!
532nm 400mW DinoDirect Firedragon III "Certified Power Guaranteed" 500mW peak!

632nm 8mW Tesla 30 year old HeNe made in Czechoslovakia
637nm 400mW WF-501b yellow anodized and CUSTOM BUCK driver
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Old 10-17-2011, 12:21 PM   #13
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Default Re: 635nm 300mw-500mw Laser Diode Driver

Guys, this is a regular old linear driver. Where's the mystery?

That white thing IS a resistor, there's no ambiguity on that point. No inductor, so not a boost/buck. It requires 6.5V input to drive an LD with a Vf of 3, so it's a step-down, and a fairly inefficient one.

This is linear. Why they need 3 ICs to accomplish this is beyond me.
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Last edited by rhd; 10-17-2011 at 12:21 PM.
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Old 10-17-2011, 01:51 PM   #14
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Default Re: 635nm 300mw-500mw Laser Diode Driver

Wait! Maybe it's just the LM317 type regulator, built without the IC? That would explain the 8-pin(op-amp) and the transistor. Then we could just call the diode a protection diode, and it would be all explained.

There's one IC... The DPAK type is marked Q1, thus it is a transistor of some sort, and that small little three pin thing is marked D, so it is a (double) diode, possibly used for making the 1.25V ref voltage.
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Quote:
Fenzir: So why is it that we want these kind of diodes? I don't understand.
anselm: Because they emit coherent light, that's why....
405nm 20mW DealExtreme pointer
445nm 1W Hotlights with CUSTOM BOOST driver
532nm 50mW DealExtreme SDLaser 301 with key, up to spec when IR-filtered!
532nm 400mW DinoDirect Firedragon III "Certified Power Guaranteed" 500mW peak!

632nm 8mW Tesla 30 year old HeNe made in Czechoslovakia
637nm 400mW WF-501b yellow anodized and CUSTOM BUCK driver
685nm 35mW diode in Jayrob pen host

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Old 10-17-2011, 02:20 PM   #15
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Default Re: 635nm 300mw-500mw Laser Diode Driver

probably just an opamp comparator switching a fet.
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Old 10-17-2011, 02:23 PM   #16
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Default Re: 635nm 300mw-500mw Laser Diode Driver

Quote:
Originally Posted by midias View Post
probably just an opamp comparator switching a fet.
Again, a fairly poorly designed one if it drops 3+ volts. Given that, I don't know why they wouldn't have just used an LM1117 instead of the complexity they went with.
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- Info release from Laserglow - Default Canadian restrictions on portable lasers (link)
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