1400ma driver wanted

[Packhorse]

Must be 20mm diameter (or less)
handle 2 18650 Li Ions in series ( 8.4v)
Prefer battery connections on base of board.

Anyone know of anything like this?
I could go 1200ma.
Or I could use a R2 dropin from DX at 1000ma.

 

[EL34]

This link is for a 20 pack of 1400ma current limiter boards that are around 17mm diameter.
http://www.dealextreme.com/details.dx/sku.3178

I have a couple hundred coming in soon, but they are not here yet.

I will be selling individual boards on my web site soon because so many people do not want to buy the bulk packs and do not want to wait when DX is out of stock, which happens quite frequently.

Probably be a couple weeks before I am ready to go on my web site.
PM me if you are interested.

 

[old4570]

SSC P7 Li-ion 5-mode driver SKU: S005025 over at KD / ProductId=1845

Will not handle 2 x 18650 .

4.2v max input , but will output around 1400mA or more .

Currently using it with a Cree P4 , and a MC-E

With CR123A 3.7v Rechargeables its doing 1.33A in my MC-E , and up to 800mA with the Cree P4 .

Its 5 mode with memory .

There is not much to chose from in the 3-8.4volt range 17mm size .. There are some that run 25mm Dia . Just search DX and KD .

 

[Packhorse]

This link is for a 20 pack of 1400ma current limiter boards that are around 17mm diameter.
http://www.dealextreme.com/details.dx/sku.3178

They are only good to 6 volt max. And will not work with 2 Li Ion cells in series.

 

[MrNaz]

Must be 20mm diameter (or less)
handle 2 18650 Li Ions in series ( 8.4v)
Prefer battery connections on base of board.

Anyone know of anything like this?
I could go 1200ma.
Or I could use a R2 dropin from DX at 1000ma.

If you want to put 1.4A through (presumably) 2 LEDs, there's a better way to do it than to get a 8.4V driver. You can use a single 1400mA driver if you wire it up in this way:

http://www.candlepowerforums.com/vb/showthread.php?t=201392

I tested it and it worked perfectly, as you can see here:

In that one, the two black stars are merely in series with the driver, and the white 16mm circular board is being driven by the driver's output. Current tested at 350mA, perfect. I don't know if this will work for your specific application, but it is certainly a very clever and useful way of wiring up LEDs in series for constant current regulation using cheap drivers.

 

[MrNaz]

They are only good to 6 volt max. And will not work with 2 Li Ion cells in series.

Just to clarify, that board that was referred to by the other posted is the exact same ones as the one I used in my earlier post, except it's only 350mA as opposed to 1400mA. You can wire up the 1400mA boards referred to in the other post in the exact same way.

Using this method you can actually use those boards to regulate current with any number of batteries and LEDs, so long as the apparent voltage to the driver is within its Vin range.

I will be using this wiring to build strings of 3 LEDs powered by a 12V source using one driver per string. and perhaps an inline resistor if the voltage drop by the LEDs is not quite enough, but I suspect given that I'll be driving it at 1050mA it should be sufficient.

 

[jspeybro]

bump... also looking for this. preferably 8.4V input (2x18650) with max diameter 20mm, current preferably in the 1200-1500mA range.
I haven't found one for this input voltage yet.

 

[Justin Case]

You can get a DX26110 and change out the sense resistor to get the higher drive current desired. Or if 1A drive is sufficient, then just use the DX26110 as-is (nominally, it delivers 1136mA based on the R22 sense resistor). Or get a KD1640 buck driver for 1A drive (nominally 1040mA based on the R27 and 2R2 sense resistors in parallel). Or get the DX3256 4-pack (nominal drive current is slightly lower at 925mA based on the R27 sense resistor).

All of the above boards are buck drivers, and use the AX2002 buck IC.

 

[Hill]

Have you looked at the Sandwich Shoppe?

SOB converter here

Can be configured up to 1.5A w/16V max input

I ordered one for driving an XP-G w/ 2 x li-on. Unfortunately, I accidently killed it.

 

[matt304]

Have you looked at the Sandwich Shoppe?

SOB converter here

Can be configured up to 1.5A w/16V max input

I ordered one for driving an XP-G w/ 2 x li-on. Unfortunately, I accidently killed it.

Is there anything similar to that SOB converter which is capable of a little more amperage, say up to 1.8A?

If I could find something capable of 8.4V and 1.8A it would be a dream come true.

 

[Hill]

Is there anything similar to that SOB converter which is capable of a little more amperage, say up to 1.8A?

If I could find something capable of 8.4V and 1.8A it would be a dream come true.

Not that I've seen. You could parallel wire 2 x 900mA drivers to get 1.8A. Search the forum, I know I've seen many customs like that. However, unless you are using a large host (C- or D-cell) it will take up a lot of space.

 

[tx101]

Packhorse, can you clear some room in your mailbox
I want to send you a PM :thumbsup:

 

[matt304]

That SOB driver states that it runs 1.5A max, but it's almost impossible to get it to output 1.5A by resistor configuration.

The only combination offered by the seller is up to 1A. Two 0.06 ohm resistors in parallel would net 1.67A. You can't really land on 1.5A.

 

[Justin Case]

You can get exactly 1500mA drive by selecting 0.05 and 0.10 sense resistors.

 

[Packhorse]

Packhorse, can you clear some room in your mailbox
I want to send you a PM :thumbsup:

Done.

 

[Hill]

You can get exactly 1500mA drive by selecting 0.05 and 0.10 sense resistors.

Exactly. I choose only 1.4A max as there was some discussion here about pushing the board too hard. In any event, the point is mute since I killed that driver. Ended up going with the 1.4A 3-speed Shiningbeam driver in this build. Only 6V max, so good for just one li-ion.

 

[MrNaz]

Exactly. I choose only 1.4A max as there was some discussion here about pushing the board too hard. In any event, the point is mute since I killed that driver. Ended up going with the 1.4A 3-speed Shiningbeam driver in this build. Only 6V max, so good for just one li-ion.

If you make a board sandwich with a 4x AMC7135 board and a 1x board you can get 1.75A and then you can use the arrangement I suggested earlier in the thread.

 

[Justin Case]

The original request was for a driver that could run at something like 8.4V, which ruled out 7135-based drivers.

If a 7135 driver is acceptable, you can also piggyback the chips themselves, as well as parallel wire the boards. Piggybacking one 7135 on a 4x7135 board will be more compact.

You can also parallel wire two SOB917s to get ~1.8A drive. There is no issue with this arrangement other than the usual thermal management. The SOB is a very small board (0.55" diam) so a 2-board sandwich will be quite compact.

The issue with the SOB is if you configure a single board for high drive currents such as 1400mA or 1500mA. The board has some sort of high impedence issue that seems to result in some boards working and some not working. If it works, then you are good to go. IIRC, the SOB's buck IC is rated to 1.5A.

 

[Black Rose]

Or get the DX3256 4-pack (nominal drive current is slightly lower at 925mA based on the R27 sense resistor).

These are nice drivers.

My only issue with them, which you advised me of when I started using them, is that they do not stay in regulation long with a single Li-Ion cell due to the required overhead, unless you use a low vf emitter like the XP-G.

I'll be trying that combination out this weekend.
It won't drive the XP-G hard, but it should be decent.