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Looking For a Driver Solution - 2.5V @ 7A, can use up to a 32650 cell

rhd

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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?
 





LaZeRz

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Direct drive would give him 4.2 volts. He needs 2.5.
 
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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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rhd

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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.

attachment.php


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

Or is that logging title from a different test?
 

rhd

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

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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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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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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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 :D

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? :thinking:

I am not familiar with the board exactly can anyone share a pic?
it is this driver found here http://www.candlepowerforums.com/vb/showthread.php?276105-High-efficient-5A-9A-Buck-Converter-for-SST-50-SST-90
the photos in the datasheet are intentionally cartoonized :D

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
 
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rhd

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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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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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41 Euros + `5Euros shipping (roughly $60 USD/CAD), but it IS adjustable!
Owch....
 

rhd

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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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