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

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.

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)

:stuck_out_tongue:

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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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

Interesting...

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

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

Most likely it’d loose any perceived difference between modes

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?

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.

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.

No more info on this?

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...

Uniquefire UF-1405 is begging for this!!!

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.

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

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?

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.

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. :slight_smile:

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

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.