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Old 05-18-2011, 11:48 PM #1
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Default Fuses?

So I went to RadioShack the other day and picked up some fuses for testing out drivers and diodes. But then it hit me - why haven't we ever put fuses into our drivers as a safety precaution against high-current draw?

Maybe because it is impractical? Do they make fuses for high-current draws small enough to fit on our driver boards? (I am talking SMDs here.)

It *would* be an excellent safety feature if you are using a previously untested driver (besides your normal testload) to give extra safety to an expensive diode.

Anyway, just a thought. Anyone have anything to say?


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Old 05-18-2011, 11:57 PM #2
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Default Re: Fuses?

Because a Laser Diode will blow way before a Fuse will...
Regular fuses are just not fast enough.

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Old 05-18-2011, 11:59 PM #3
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Default Re: Fuses?

You can get SMD fuses small enough, but the Diode would blow quicker than even a fast-blo fuse if it was sized close to the diodes limit IMO.

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Old 05-19-2011, 12:38 AM #4
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Default Re: Fuses?

Laser diodes generally die from overheating or static discharge. They don't often die from over-current unless you hooked something up wrong, or you're talking about the people that like to drive their 445s at ridiculous levels like 1.8A A fuse won't help you there.
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Old 05-19-2011, 02:14 AM #5
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Default Re: Fuses?

I think we'd need fuses with wires smaller than the bonding wires on the laser diodes. Better to have some sort of capacitor or something that can just eat the charge.
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Old 05-19-2011, 02:28 AM #6
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Default Re: Fuses?

There are fuses this small but as the others said I don't think this will help, on the other hand it couldn't hurt either

the device marked 242 is a resistor the fuse is the one marked FP, FlaminPyro
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Old 05-19-2011, 02:39 AM #7
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Default Re: Fuses?

You can also get SMD fuse holders for them tiny fuses.
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Old 05-19-2011, 02:51 AM #8
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Default Re: Fuses?

no way a fuse holder for them tiny flaminpyro fuses ?
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Old 05-19-2011, 02:54 AM #9
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Default Re: Fuses?

yep. They are on lots of PCBs, and they suck prying out the old fuse for a new one.
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Old 05-19-2011, 03:02 AM #10
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Default Re: Fuses?

In theory, if you were building something like an HL63133DG-based pointer, where the diode is $200 and you're nervous about killing it, you could:

- Find a cheap IR diode with roughly the same current death range. I think something like a 300mA IR would work with the diode I mentioned. Put it in series with your expensive diode, arctic silver it to the inside somewhere for heatsinking, make sure your driver can handle the voltage, and voila, you have a fuse.

I don't think this is a very good idea, nor a very useful one, but my imagination asked me to point it out.
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Old 05-19-2011, 03:36 AM #11
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Default Re: Fuses?

Quote:
Originally Posted by rhd View Post
In theory, if you were building something like an HL63133DG-based pointer, where the diode is $200 and you're nervous about killing it, you could:

- Find a cheap IR diode with roughly the same current death range. I think something like a 300mA IR would work with the diode I mentioned. Put it in series with your expensive diode, arctic silver it to the inside somewhere for heatsinking, make sure your driver can handle the voltage, and voila, you have a fuse.

I don't think this is a very good idea, nor a very useful one, but my imagination asked me to point it out.
You'd have to melt the bond wires for that to work. At that point, the diode you wanted to save probably would have LED'd. ><

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Old 05-19-2011, 03:43 AM #12
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Default Re: Fuses?

So dose this mean there are no realy fast fuses ?
like
50 microsecond type,

only in space ships I know

cuz they $300.00 each
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Old 05-19-2011, 03:43 AM #13
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Default Re: Fuses?

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You'd have to melt the bond wires for that to work. At that point, the diode you wanted to save probably would have LED'd. ><

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Yep... makes sense - see, I knew it wasn't a good idea
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Old 05-19-2011, 04:01 AM #14
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Default Re: Fuses?

Quote:
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Find a cheap IR diode...
As pointed out, the main problem is they don't generally fail open. They undergo what's called catastrophic optical damage (COD) aka "ELL-EE-DEEing" So a huge current spike would likely kill them both.
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Old 05-19-2011, 04:06 AM #15
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Default Re: Fuses?

Yes I can see the diode can conduct or turn on very fast so the fuse would need to work so fast it isn't practical to make one.
and as you said COD would probly still happen when the fuse blows.

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Old 05-19-2011, 04:13 AM #16
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Default Re: Fuses?

Might as well just buy a LASORB to protect the diode if space is not an issue.
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