LD-40! (17mm Buck driver, 3-16.8v!)

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comfychair
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LD-40! (17mm Buck driver, 3-16.8v!)

Quote:
Diameter:17mm    Hight:10mm   Thickness: 1.6MM

Input:1-4 3.7V li-ion batteries

brightness modes:Low 10mA-Mid 400mA-High 2A

Always start on Low, NO mode memory

Anti-reverse protection

Anti-short circut protection

Input voltage: 3~16V
Output: drive 1 or 2 LED,Drive 2x LED In series (so MTG2 = YES)

Max Current: 2A
Mininum Current: 10mA

http://www.cnqualitygoods.com/goods.php?id=2173

Big fat R100 practically begging to be replaced by a R025...

...and undocumented, cryptic extra solder pads on the battery side.

Edited by: comfychair on 10/03/2014 - 06:46
comfychair
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Reserved (so I can annoy the piss out of everyone for no reason instead of just updating the first post or adding a new reply at the end)

ryansoh3
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comfychair wrote:

Reserved (so I can annoy the piss out of everyone for no reason instead of just updating the first post or adding a new reply at the end)


Silly

Looks like a beefy driver. The modes don’t look so optimal though, no mode memory and always starts off on low. No blinky modes though, that’s good.

I wonder what the numbered pads are for…

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comfychair
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OT: The info on the new-style 32mm DRY driver has changed too, has a description of what the mystery stars do. I got one of the very first ones after the redesign, and the stars on mine don't do anything so they must have changed the firmware.

http://www.cnqualitygoods.com/goods.php?id=2123

RaceR86
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Interesting...

Waiting for feedback on how well it handles a current boost. Smile

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LSX
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What would happen if that R100 was just bridged with solder?

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Most likely it’d loose any perceived difference between modes

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LSX
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Hmm that’s interesting, that is exactly what happened with my TN30. What is the minimum resistor value that can be used to stop this happening?

comfychair
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Different for different drivers. Some lose all the modes, some still behave correctly, and some are pure evil and go direct drive... 3 cells in series into a single XML2 doesn't work for very long.

tryps
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Looks interesting,
I wonder if it would fit in a Convoy M1 pill, would be nice as is driving a Nichia219b if it uses CC regulation.
But 10mm plus board size is pretty thick.

Lothar
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No more info on this?

Current Collection:

BLF: BLF-GT90, BLF-GT70 (CW Sliced), BLF GTmini, BLF-LT1; 

BTU: Shocker (3 x SST-40 @ 8A)

Solarforce: L2P (XM-L2 U3 @ 4A), MPP-1 (XP-L HI @ 6A), MPP-3 (3 x XM-L2 U2 @ 12A), M6 (Nichia 319A @ 6A), M8 (XHP-50.2 @ 9A), 9x (9 x XM-L2 U2 @ 2A)

Coming Soon: Lumintop: BLF-GT4; 

comfychair
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Nobody has one to poke at yet. I ordered 2 on the 24th, but they're still over there waiting for somebody to put them on a damn airplane...

bibihang
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comfychair
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That remains to be seen, depends on how well it handles an output boost. If it behaves nice up to 4-5A it will be good for lots of stuff, if it won't go much above the stock 2A it'll be a lot less useful.

bibihang
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CNQ website is down, I can’t even have a look at it. Sad

THE_dAY
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Is this a linear driver or something else?
I would like to drive a Nichia 219/119 at 2A regulated but the issue of high Vf comes into play with the linear driver.
Maybe this is something different that can keep 219A regulated at 2A?

comfychair
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It is a buck driver, a linear driver would turn into a lump of stinky carbon if you asked it to output 3 volts from a 16 volt input.

THE_dAY
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Thank you Comfy,

Sorry if these q’s seem obvious.
Would this drive the 219A in regulation from single Li-ion until cell is gets low?
The high Vf of the 219A at 2A wouldn’t be a problem for this driver?

EDIT: I understand no one has it yet but looking for general answer regarding buck drivers. Smile

comfychair
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The general rule of thumb for buck drivers is something like 1-1.2v overhead needed to remain in regulation.

JaredM
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The driver appears to be named LD-40, not 44. Wink

I’m going to try this one out though. Can’t go wrong for that price if it can deliver 3-4A and still be above 65% efficiency.

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comfychair
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Good luck, mine have been stuck at 'origin post is preparing shipment' since the 26th.

wolf359
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GRRRRRRRR saw LD 44 in the recent posts and thought yeah new Fenix light, ah well encourages me to pay more attention, Naw CBA.

comfychair
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LOL, is that better?

wolf359
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Yes thats better for those of us (me) that fail to pay attention to the section the post is in due to there excitement over the prospect of a new Fenix light.

Thank You

djozz
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Awaiting the results of modding this driver I ordered two, hoping that they can be made to deliver 4A current. (and still battling with Fasttech's Bonnie to get them to deliver the Uniquefire UF-1405 instead of the wrongly delivered UF-1406 Yell)

comfychair
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Hopefully the stock current is so low only to help out with making it usable with only 1 cell (see the Nichia discussion a few posts up), that inductor looks far too beefy for such low current. If the other parts of the driver are truly limited to not much over 2A I think they would have used a 2A inductor, which would be a lot smaller than what's on there.

Ledsmoke
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Looking forward to an update on these.

~ Ledsmoke ~

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nofearek9
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same here ,might be good option for car applications as well.

comfychair
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Nothing more than pictures so far...

http://75.65.123.78/ld-44/Img_0097.jpg

http://75.65.123.78/ld-44/Img_0103.jpg

ohaya
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I ordered several of them on 9/15, and it took until today (9/20) for them to show up as “Acceptance” at USPS.com :(…

Quote:
2014-09-20 19:33, Qingyuan, leaving the treatment center, sent to Guangzhou 2014-09-20 13:53, Qingyuan City Logistics Branch Courierpost large customer marketing center, leaving the treatment center, sent to Guangzhou 2014-09-20 13:49, Qingyuan City Logistics Branch Courierpost large customer marketing center, acceptance
JaredM
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http://intl-outdoor.com/ld4b-24a-17mm-buck-driver-3v16v-p-817.html

IOS calls it an LD-4B

Also the output currents are different.

Max is up to 2.4A

There are also mode groups..

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