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Old 12-07-2011, 02:35 AM #1
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Default Looking For a Driver Solution - 2.5V @ 7A, can use up to a 32650 cell

Any thoughts?

I'm trying to drive a 7W IR in a handheld form factor, inside a SAIK host. It can handle a 32650 cell (I think).

DDLs are out, even with 1084s, the current target would require two ICs, plus the dropout is too high for single-cell driving anyway.

I've tried paralleling 16 AMC7135 chips, and the results are awful. Any ideas?


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Old 12-07-2011, 02:40 AM #2
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Default Re: Looking For a Driver Solution - 2.5V @ 7A, can use up to a 32650 cell

um DIRECT DRIVE or are you totally not having that as a option?
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Old 12-07-2011, 02:42 AM #3
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Default Re: Looking For a Driver Solution - 2.5V @ 7A, can use up to a 32650 cell

Direct drive would give him 4.2 volts. He needs 2.5.
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Old 12-07-2011, 02:45 AM #4
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Default Re: Looking For a Driver Solution - 2.5V @ 7A, can use up to a 32650 cell

Quote:
Originally Posted by bennett326 View Post
um DIRECT DRIVE or are you totally not having that as a option?
Direct drive isn't an option.
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Old 12-07-2011, 02:46 AM #5
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Default Re: Looking For a Driver Solution - 2.5V @ 7A, can use up to a 32650 cell

oh correct maybe a few led drivers in parallel that would take a while to find one that worked. i think you just need to experiment. try modding that 9amp driver maybe idk. just throwing stuff out there

EDIT the 9amp wont work its buck
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Old 12-07-2011, 05:24 AM #6
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Default Re: Looking For a Driver Solution - 2.5V @ 7A, can use up to a 32650 cell

Alright, so the challenge just got a bit more interesting. It's actually ~3.5V once you kick the current up real high. I didn't know IRs went above 3. Anyway, it's not often I see my laserbee do this - and never would have anticipated it from a handheld.



What would probably be just fine, is a 6A buck. I'd use 3x IMR 14500s, and I think I'd be able to fulfill the driver input requirements.

Basically, anything meant for an SST-90 should work (if it's meant to push the output to 6 or 7A), but I don't quite have room for a super TALL driver. Any suggestions?
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Old 12-07-2011, 05:48 AM #7
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Default Re: Looking For a Driver Solution - 2.5V @ 7A, can use up to a 32650 cell

Were you seriouslly running over 2500mw with an acrylic lens?

Or is that logging title from a different test?
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Old 12-07-2011, 06:24 AM #8
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Default Re: Looking For a Driver Solution - 2.5V @ 7A, can use up to a 32650 cell

Quote:
Originally Posted by rocket689 View Post
Were you seriouslly running over 2500mw with an acrylic lens?

Or is that logging title from a different test?
Oh ya - different test, probably from months ago

So - the mission is a 6A buck driver. That isn't ginormous.
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Old 12-07-2011, 10:06 AM #9
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Default Re: Looking For a Driver Solution - 2.5V @ 7A, can use up to a 32650 cell

Are you going to try reducing the fast axis divergence at all? Love to see you try those 808 AR anamorphic prisms from a 473nm BWB-10-OEM.
What wavelength is this handheld beast?
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Old 12-07-2011, 01:09 PM #10
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Default Re: Looking For a Driver Solution - 2.5V @ 7A, can use up to a 32650 cell

I'm guessing this is the 594nm PGL host?

How much room do you have to play with?

I highly doubt you will find anything that small with a 6A or 9A output

The closest I could find is 4A

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But that's still 49 x 23.5 x 13.3 mm ( L*W*H )
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Old 12-07-2011, 01:16 PM #11
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Default Re: Looking For a Driver Solution - 2.5V @ 7A, can use up to a 32650 cell

hey that 9amp buck driver comes in a 5amp version that would work perfect if 5amp is O.K with you
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Old 12-08-2011, 12:44 PM #12
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Default Re: Looking For a Driver Solution - 2.5V @ 7A, can use up to a 32650 cell

Quote:
Originally Posted by bennett326 View Post
hey that 9amp buck driver comes in a 5amp version that would work perfect if 5amp is O.K with you
isn't the 9A version adjustable? I am sure it can be set to output 7A or any other current you want

EDIT

ah it's said it's a fixed output at 9A....
but if the current is set by sense resistors it can be modified, right?

I am not familiar with the board exactly can anyone share a pic?
it is this driver found here http://www.candlepowerforums.com/vb/...-SST-50-SST-90
the photos in the datasheet are intentionally cartoonized

quote from datasheet:
Calculating input/output voltage or current: Uin * Iin = Uout * Iout

but if you are going to use a single cell that won't work. you need at least 2V input above the output

Last edited by foulmist; 12-08-2011 at 01:02 PM.
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Old 12-08-2011, 02:59 PM #13
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Default Re: Looking For a Driver Solution - 2.5V @ 7A, can use up to a 32650 cell

Actually, this is going inside a Saik with a special heatsink design from Moh.

Can you link me to the adjustable 9A/7A buck?
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Old 12-08-2011, 04:13 PM #14
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Default Re: Looking For a Driver Solution - 2.5V @ 7A, can use up to a 32650 cell

Quote:
Originally Posted by rhd View Post
Actually, this is going inside a Saik with a special heatsink design from Moh.

Can you link me to the adjustable 9A/7A buck?
it's 9A / 5A two versions of it...

I posted the link in my above post. But I am not sure whether it is adjustable ... BUT I think it might be!

It all depends on how the current is regulated..
If someone has one of those it would be nice to see a photo of it ...
If there are sense resistors they might be swapped to achieve the current for your specific needs.
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Old 12-08-2011, 04:34 PM #15
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Default Re: Looking For a Driver Solution - 2.5V @ 7A, can use up to a 32650 cell

41 Euros + `5Euros shipping (roughly $60 USD/CAD), but it IS adjustable!
Owch....
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Old 12-08-2011, 05:33 PM #16
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Default Re: Looking For a Driver Solution - 2.5V @ 7A, can use up to a 32650 cell

Quote:
Originally Posted by foulmist View Post
it's 9A / 5A two versions of it...

I posted the link in my above post. But I am not sure whether it is adjustable ... BUT I think it might be!

It all depends on how the current is regulated..
If someone has one of those it would be nice to see a photo of it ...
If there are sense resistors they might be swapped to achieve the current for your specific needs.
Oh that one - gotcha.

There's no way I can afford to spend that kind of money on this project. $60 for the driver is not in the cards.
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