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Old 07-10-2008, 01:38 PM #1
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Default High current diode driver

Hi guys, I'm in need of some help.

I need to build a constant current driver capable of driving to around 3A. It will be powered by a DC adapter @ 12v, but I can get one with a lower input voltage if needed.

basically the driver I use now to test all my diodes is an LM317 built into an easy to use case that plugs into the wall via the 12v adapter. The problem is now I am playing with some much higher power c-mount diodes and I need to be able to supply more than 1.5A of current (the limit for the LM317)

Any ideas??

Thanks in advance!


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Old 07-10-2008, 02:01 PM #2
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Default Re: High current diode driver

Try the LM350, it can take up to 3A and is just like the LM317.
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Old 07-10-2008, 02:21 PM #3
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Default Re: High current diode driver

Not sure if it's doable (or recommended), but you may be able to parallel two LM317 circuits to get 3A capability. *You'll need some good heatsinking for all that, though.

EDIT: I deleted my double-post.
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Old 07-10-2008, 02:51 PM #4
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Default Re: High current diode driver

woah, deja vu
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Old 07-10-2008, 03:27 PM #5
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Default Re: High current diode driver

Quote:
Originally Posted by sk8er4514
woah, deja vu
yeah ;D deja vu
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Old 07-11-2008, 01:03 AM #6
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Default Re: High current diode driver

2 or 3 7135 boards off a 5v adaptor?
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Old 07-11-2008, 02:01 AM #7
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Default Re: High current diode driver

A old computer PSU would be a good place to get a alum heat sink for LM317's
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Old 07-11-2008, 08:28 AM #8
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Default Re: High current diode driver

Quote:
Originally Posted by J_Dogg
A old computer PSU would be a good place to get a alum heat sink for LM317's
I tried heat sinking it and all, I even had my lm317 TEC cooled ;D but even with the cooling the most it would crank out is 1.6A and then fall on its face.
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Old 07-11-2008, 08:29 AM #9
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Default Re: High current diode driver

Quote:
Originally Posted by pocketfluff
2 or 3 7135 boards off a 5v adaptor?
details?
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Old 07-11-2008, 12:13 PM #10
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Default Re: High current diode driver

Quote:
Originally Posted by GooeyGus
[quote author=pocketfluff link=1215697091/0#6 date=1215738194]2 or 3 7135 boards off a 5v adaptor?
details?[/quote]

Search "amc7135" into dealextreme. There are ready to go boards that supply 1.4A. Nice and simple
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Old 07-11-2008, 02:20 PM #11
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Default Re: High current diode driver

It looks like they're just connecting those chips in parallel to get 1400mA, so you could probably parallel two of those 1400mA boards to get ~2.8A? I think gazoo has used these extensively and has a thread somewhere about them (but I'm too lazy to look for it now :P).
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Old 07-11-2008, 04:30 PM #12
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Default Re: High current diode driver

just put some lm317 circuits in parallel (if you have some lm317's lying around)
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