High Current Boost Driver

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aEx155

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Are there any boost drivers that can get 1A+ out of a 1.2v NiMh cell?

I know there are many drivers to drop the voltage coming off of LiIon cells that can output over an amp, and there are some that boost voltage, but not anything about one amp.

I really would like to replace the driver in one of my lights but keep the 1xAA format with NiMh cells.
 
I've never seen one, will be interested to know its efficiency if you find one.

Assuming that your LED draws 1A @ 3.6V, then a 100% efficient driver will need to pull 3A from the battery with no voltage sag to deliver that to the LED. Drivers also get less efficient as the difference between Vin and Vout increases, so you've got a rather inefficient driver there as well. If there is one, I doubt your battery is going to last very long.
 
You can parallel connect Luxdrive 2009 micropucks but I don't know if you can do this with more than 2.
link
 
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Does anyone know what current some high output 1xAA lights are driving their LEDs at? (the Quark 1xAA or the Xeno E03 are two that I have in mind, but there are more)
 
like what was said in previous posts.... LEDs that are driven at 1+ amp want closer to 4v input and the current from a 1.2v (nimh) cell would have to be 3-4 times greater. You have problems of efficiency, heat generation, and current loss everywhere at that current level even a good spring and switch can cause a 0.1v loss at 3-4amps so you could see up to 0.25v loss in the electrical path from the battery to the driver to the LED. If you were using a C or D nimh the cell may not heat up a lot supplying that amount of current. If the battery heats up the LED and battery both compete with the heatsinking device which reduces the heatsinking for both. I don't think a decent 1AA battery tube/light has enough mass to accomodate both for anything but a short burst. Most people I have seen that have had lights able to burst for a few minutes complain that they essentially want it to run continuous for that level in the end so having a short burst just frustrates people like teasing them with extra light that they cannot "keep" going.
 
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Huh, I would have figured that the current it was running was a bit higher, but as you guys have said, its hard to drive something at that current from such low voltage.

Does anyone have measurements for the Xeno E03?
 
At one time sku 7882 from DX could give 1 amp output, or close to it. The later reports seem pretty negative, but the ones I had were good. However, they are sold out.

It is available from e-lectronics.net however. That website claims up to 700mA output with one nimh cell.
 
Would it make sense to just go with an XP-G instead of an XM-L if the maximum drive current is below 1A? I remember someone took the graphs from the CREE datasheets and overlaid them on top of each other but I can't find that thread/image.
 
aEx155 said:
Would it make sense to just go with an XP-G instead of an XM-L if the maximum drive current is below 1A? I remember someone took the graphs from the CREE datasheets and overlaid them on top of each other but I can't find that thread/image.
Click to expand...
I think if they are the same bin the difference is so minor that it comes down to preference and cost. The XM-L will probably have a wider beam and cost more than the XP-G.
 
Does anyone have measurements on either of these two Shiningbeam drivers? It would be nice to confirm if they really do the stated current or if those are just estimates.
 
aEx155 said:
Does anyone have measurements on either of these two Shiningbeam drivers? It would be nice to confirm if they really do the stated current or if those are just estimates.
Click to expand...

The First of these drivers, SKU 1406, will draw sufficient current to put out 900mA (or therabouts - hard to get accurate readings with my equipment) BUT it needs to be fed at 1.5v+ to do so. Feeding the driver with a benchtop power supply @1.5v draws 3.5A (maybe more, power supply limit) HOWEVER feeding with NiMH Cell only draws 1.85 A from the cell, equating to 675mA at the LED without taking into account efficiency. Assuming 70% efficiency for the driver that's maybe 450mA... Hardly the pocket rocket I was hoping for
 
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