New version DRY driver info thread goes here

56 posts / 0 new
Last post
comfychair
comfychair's picture
Offline
Last seen: 6 years 4 months ago
Joined: 01/12/2013 - 05:39
Posts: 6198

Ouchyfoot wrote:
I just installed the new Dry driver in a "Tangsfire 3XU2":http://www.tmart.com/TangsFire-3XU2-18W-4300LM-Aviation-Aluminum-Flashli... The emitters are XM-L2 U2 on Noctigons, and everything is wired with 18AWG wire. With three fully charged KingKong ICR26650 I'm getting 3.4A at the tail in turbo. I was hoping for a little better. I'd really like to see 4A. I'm considering trying the old 20mm Dry driver to see what it'll give me. Is that driver known for Squealing. I'll charge up my E-Moli cells to see if there's any improvement. Unfortunately the cells are so long I can't even engage the first thread of the tailcap.

This new driver is regulated in all modes unlike the old one. Turbo is not direct drive, it's 3.5A. Since you have 3 LEDs and 3 cells, input amps will be fairly close to output amps, but it is NOT in any way direct drive. Bypass the resistors if you want more and are OK with it being only suitable for use with a matching number of LEDs & cells after the bypassing (you'll have to undo that if you later want to use it with a single LED and 2 or 3 cells).

wight
Offline
Last seen: 2 years 6 months ago
Joined: 11/27/2013 - 16:40
Posts: 4969
Location: Virginia, USA

comfychair wrote:

FET on the left has the drain going to ground, one on the right goes to LED-. But they’re in series – source for the one on the right goes through the vias to the battery side, to the other set of vias at the left FET’s source pin.

LED- > drain > source > source > drain > ground


Gate for the FET on the left connects to Source by way of 20k of resistors. It’s those two series resistors marked 103 (10k Ohm) for a total of 20k. It appears that the PWM output from the MCU to the 5241 buck controller also has a 10k resistor connecting it to Source (marked 1002). I do not understand the purpose of this arrangement. When the PWM goes high the lefthand FET either becomes forward or reverse biased, but I am becoming confused. With my limited understanding I thought maybe that this was a hack to use the 5241 as a synchronous buck controller, but this does not appear to be the case.

Side note: it may be fair to assume that the 5241a is just an even more generic 5241 than the others (LY5241, QX5241 and SM5241). Here is a listing on DinoDirect selling 5241a’s as “other brands” of QX5241… I think. -oh, nevermind. Of course it’s just a generic QX5241, the a/b designation relates to feedback voltage. It’s right there in the QX5241’s datasheet.

Still fine, still on a break. One day I’ll catch up with you folks! previous wight catchup Wink
list of my drivers & variants (A17DD, FET+1 stuff, WIP stuff, etc)

gaston01
gaston01's picture
Offline
Last seen: 1 year 7 months ago
Joined: 12/16/2013 - 18:26
Posts: 296
Location: Buenos aires, Argentina

Hi guys

Can be used with 2 batteries in series and 3 series xml2?

Thanks!

Sorry for my bad English…

comfychair
comfychair's picture
Offline
Last seen: 6 years 4 months ago
Joined: 01/12/2013 - 05:39
Posts: 6198

gaston01 wrote:
Hi guys Can be used with 2 batteries in series and 3 series xml2? Thanks!

No, it is not a boost driver. Output voltage will always be lower than input voltage. 2 series cells = max 8.4v, 3 series XML2 would require ~9.1v to run at 1 amp, ~10.3v for 3 amps.

gaston01
gaston01's picture
Offline
Last seen: 1 year 7 months ago
Joined: 12/16/2013 - 18:26
Posts: 296
Location: Buenos aires, Argentina
comfychair wrote:

gaston01 wrote:
Hi guys Can be used with 2 batteries in series and 3 series xml2? Thanks!

No, it is not a boost driver. Output voltage will always be lower than input voltage. 2 series cells = max 8.4v, 3 series XML2 would require ~9.1v to run at 1 amp, ~10.3v for 3 amps.

Sad :_( …ok many thanks.

Sorry for my bad English…

comfychair
comfychair's picture
Offline
Last seen: 6 years 4 months ago
Joined: 01/12/2013 - 05:39
Posts: 6198

Well to be accurate, yes it can be used with 2 cells, and yes it can be used with 3 series XML2s, but not both at the same time. 3 XML2s would require 3 or 4 cells. I guess you could use 4 18350s?

gaston01
gaston01's picture
Offline
Last seen: 1 year 7 months ago
Joined: 12/16/2013 - 18:26
Posts: 296
Location: Buenos aires, Argentina

Not come to understand well … you say that for some series parallel combination?
About of the 18350 is a good idea! but I can not use where I want to install.

Thanks

Sorry for my bad English…

comfychair
comfychair's picture
Offline
Last seen: 6 years 4 months ago
Joined: 01/12/2013 - 05:39
Posts: 6198

Input voltage must always be higher than output voltage with this driver, however you wire it up with whatever parts combo. To use 3 XML2s in series, the input voltage must be higher than the voltage needed to run 3 series XML2s. With only 2 cells you only have 8.4 volts input, but 3 series XML2s need more than 10 volts. That means you need more than 10 volts input, that means 3 or 4 cells (12.6 or 16.8v) input.

If you cannot change things around to get any more input voltage than 8.4v, you would have to wire the 3 XML2s in parallel, which would not be a good way to do it, since with LEDs in parallel the output current will be divided equally between them, that means it would only run at something like 1200mA per LED. If you wire them in series and raise the input voltage to 12.6 or 16.8v, the output will be 3.5A to all LEDs.

comfychair
comfychair's picture
Offline
Last seen: 6 years 4 months ago
Joined: 01/12/2013 - 05:39
Posts: 6198

Why is it you can't put two 18350s in the place of each 18650, which would give you 16.8v input?

comfychair
comfychair's picture
Offline
Last seen: 6 years 4 months ago
Joined: 01/12/2013 - 05:39
Posts: 6198

The most recent listing has slightly different specs: http://www.cnqualitygoods.com/goods.php?id=2123

As I mentioned, the early one I got didn't do anything different with the 'stars' bridged, it now has descriptions of what the stars do. Should be just a firmware change, the hardware is the same.

Group 1: 5modes by default (High/Mid/Low/Strobe/SOS) (no stars bridged)
Group 2: 5%  30%  100%
Group 3: 100%  30%  Flash
Group 4: 100%  50%
Short-circuit two stars to change Group.

gaston01
gaston01's picture
Offline
Last seen: 1 year 7 months ago
Joined: 12/16/2013 - 18:26
Posts: 296
Location: Buenos aires, Argentina
comfychair wrote:

Input voltage must always be higher than output voltage with this driver, however you wire it up with whatever parts combo. To use 3 XML2s in series, the input voltage must be higher than the voltage needed to run 3 series XML2s. With only 2 cells you only have 8.4 volts input, but 3 series XML2s need more than 10 volts. That means you need more than 10 volts input, that means 3 or 4 cells (12.6 or 16.8v) input.

If you cannot change things around to get any more input voltage than 8.4v, you would have to wire the 3 XML2s in parallel, which would not be a good way to do it, since with LEDs in parallel the output current will be divided equally between them, that means it would only run at something like 1200mA per LED. If you wire them in series and raise the input voltage to 12.6 or 16.8v, the output will be 3.5A to all LEDs.

Thanks for the technical explanation Wink this I already had more or less clear…
This part had not understood:

Well to be accurate, yes it can be used with 2 cells, and yes it can be used with 3 series XML2s, “but not both at the same time.” ……

Sorry for my bad English…

comfychair
comfychair's picture
Offline
Last seen: 6 years 4 months ago
Joined: 01/12/2013 - 05:39
Posts: 6198

You can use it with only 2 cells in series, as long as you only use one XML2 (or more than one in parallel). 8.4v input is greater than 3.4v output.

You can use it with 3 XML2s in series, as long as you have 3 or more cells input. 12.6v & 16.8v input is greater than ~10.5v output.

But you cannot have both at the same time in the same flashlight - 8.4 volts will not power 3 LEDs in series.

gaston01
gaston01's picture
Offline
Last seen: 1 year 7 months ago
Joined: 12/16/2013 - 18:26
Posts: 296
Location: Buenos aires, Argentina
comfychair wrote:

Why is it you can’t put two 18350s in the place of each 18650, which would give you 16.8v input?

Because is a multi battery flashlight 2s 2p 18650 total 4 batteries with 18350 they would be too many volts and batteries Wink

Sorry for my bad English…

comfychair
comfychair's picture
Offline
Last seen: 6 years 4 months ago
Joined: 01/12/2013 - 05:39
Posts: 6198

Four 18350s in series is 16.8 volts, this driver works fine with 16.8 volts and even a single LED. Go back to post #14 again and look at the numbers.

comfychair
comfychair's picture
Offline
Last seen: 6 years 4 months ago
Joined: 01/12/2013 - 05:39
Posts: 6198

OK, 2S2P would need 8 18350s, but it would still be only 16.8v. It would end up as 4S2P.

gaston01
gaston01's picture
Offline
Last seen: 1 year 7 months ago
Joined: 12/16/2013 - 18:26
Posts: 296
Location: Buenos aires, Argentina
comfychair wrote:

Four 18350s in series is 16.8 volts, this driver works fine with 16.8 volts and even a single LED. Go back to post #14 again and look at the numbers.

Yes! I see, it works great with 2 and 3 batteries with single xml2.

I love group 2: 5%  30%  100% a pity it seems that he lost the turbo :~

Sorry for my bad English…

comfychair
comfychair's picture
Offline
Last seen: 6 years 4 months ago
Joined: 01/12/2013 - 05:39
Posts: 6198

Losing the turbo gave us the ability to run a single XML2 from 4 cells without blowing anything up. The old turbo only worked with 3 cells & 3 LEDs.

Mike C
Mike C's picture
Offline
Last seen: 2 months 2 weeks ago
Joined: 01/22/2014 - 08:03
Posts: 2640
Location: Sweden

Anyone care to explain what exactly a DRY driver is? I guess it’s not wet, but I wouldn’t think any drivers are…

ImA4Wheelr
Offline
Last seen: 1 year 1 week ago
Joined: 02/03/2013 - 14:51
Posts: 7935
Location: SC

Before my time, but my understanding is that there was a light called Dry that had a driver that went into direct drive in the highest mode.  When this driver became available separately, it became a very popular driver for mods.  I'd like to know why this new "version" was called "Dry".  It's so different in so many ways.  Is there a new Dry light that uses this driver?

bibihang
bibihang's picture
Offline
Last seen: 1 month 1 week ago
Joined: 11/10/2011 - 09:32
Posts: 2452
Location: Malaysia

Mike C wrote:
Anyone care to explain what exactly a DRY driver is? I guess it’s not wet, but I wouldn’t think any drivers are…

DRY” is a name for this case, however the driver is not really physically dry or wet. Big Smile

There was a flashlight called “DRY” back in few years ago, and Ric from CNQ has even organized a group buy for DRY in early 2012 in BLF and I bought one from there too (also the first GB I participated in BLF Wink ). During that time there were not a lot of powerful multi-emitter flashlight and DRY was one of the highest lumens output LED flashlight available, putting out around 2500 OTF lumens was pretty impressive back then. The flashlight has good heatsinking (integrated) and the main point of this driver is allowing high current draw at turbo mode, it was claimed as direct-drive by the seller but it was actually still current regulated tested by somebody here.

And then there were several variations of this driver which I couldn’t remember the details. This year Ric has released the updated version of DRY flashlight, which is using this new larger diameter DRY driver. The older DRY driver was about 26mm (or a bit off), and the newer one is 32mm. According to CNQ website it seems that Ric has stopped selling the DRY driver separately, but the DRY flashlight is still available, though I’m not sure how is the quality and the driver inside.

EDIT: A bit of nostalgia I have here lol.
wemissyoufoy DRY flashlight review
DRY groupbuy

bibihang
bibihang's picture
Offline
Last seen: 1 month 1 week ago
Joined: 11/10/2011 - 09:32
Posts: 2452
Location: Malaysia

gaston01 wrote:

This part had not understood:

Well to be accurate, yes it can be used with 2 cells, and yes it can be used with 3 series XML2s, “but not both at the same time.” ……


To my understanding I think what comfychair trying to say is:

1. This driver accepts 2 cells in series – Correct
2. This driver can power 3 series XM-L2 – Correct
3. This driver can power 3 series XM-L2 with 2 cells in series – NO IT CAN’T (input voltage < required output voltage in this case, and a boost driver is needed for this job)

comfychair
comfychair's picture
Offline
Last seen: 6 years 4 months ago
Joined: 01/12/2013 - 05:39
Posts: 6198

I think I remember reading that an updated version of the DRY was in the works? Apparently the new host will fit this new driver, hence the name.

These drivers are still available. This is the second revision of this new style - first version, discontinued now: http://www.cnqualitygoods.com/goods.php?id=1349 ; current version with updated firmware: http://www.cnqualitygoods.com/goods.php?id=2123

Old version DRY empty host still listed here, though only 3 left: http://www.cnqualitygoods.com/goods.php?id=1177 I do not think this new driver will fit the 1st gen DRY host, though.

Mike C
Mike C's picture
Offline
Last seen: 2 months 2 weeks ago
Joined: 01/22/2014 - 08:03
Posts: 2640
Location: Sweden

Thanks for the explanation bibihang. Things are a little clearer now.

Ronin42
Ronin42's picture
Offline
Last seen: 2 years 10 months ago
Joined: 12/17/2014 - 22:17
Posts: 1760
Location: Alameda, CA

This may be what I have been loking for to drive a 3S MT-G2,

Anyone know of other current controlled Buck Drivers for 3S 18650 Cells?

(“It’s good that most people can’t remember their previous lives. Otherwise
things would be a lot more complicated than they already are.”
Ajaan Lee Dhammadharo)

wight
Offline
Last seen: 2 years 6 months ago
Joined: 11/27/2013 - 16:40
Posts: 4969
Location: Virginia, USA

Ronin42 wrote:
This may be what I have been loking for to drive a 3S MT-G2,

Anyone know of other current controlled Buck Drivers for 3S 18650 Cells?

Use search. Search would have taken you to MRsDNF’s thread, which is the correct place to be: MRsDNF – Post your MT-G2 driver results here.

Still fine, still on a break. One day I’ll catch up with you folks! previous wight catchup Wink
list of my drivers & variants (A17DD, FET+1 stuff, WIP stuff, etc)

Pages