Blf a6/astrolux s1 driver and xhp50

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hannesremo
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Blf a6/astrolux s1 driver and xhp50

Hi! So I had this Idea of using the blf driver for powering an xhp50. I will be putting it in a light that requires a 17mm driver(maybe an s2+ or my thorfire vg10). There are tons of xhp50/70 drivers, but the smallest one I can find is the fx6 driver, at 22mm.
So I know the blf driver puts out 4-6 amps at max 4.2v, so I was thinking if I could connect 2 blf’s in series and make 8,2v for the xhp50? If not I could always direct drive it, but that’s inconvenient, and stuff would probably melt, haha. Thanks!

djozz
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I wish it would work like that, but drivers in series AFAIK does not work.

Actually there are not many direct drivers for 6V leds, the one i know is from Mountain Electronics ( http://www.mtnelectronics.com/index.php?route=product/product&path=67_11... ), but shipping to Europe for just a driver makes it pretty expensive. There’s enough interesting to find on his website so perhaps you can combine some stuff to make the shipping worthwhile.

hannesremo
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hm, how about just straight from battery, if I use 2 18350’s. I know right, the shipping is more expensive than a driver from there, I checked out mtn, but It wasn’t worth it, actually found one of ebay just now, at 17mm, but it was only 4 amps, bummer. Thanks for the answer!

djozz
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Can you give the ebay link for that driver?
4A (25W!) is massive for a XHP50 in a small host like you plan to use. and I wonder how much more than 4A you get anyway with 2×18350 cells.

hannesremo
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djozz
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Ah, that is the same driver that Mtn El. has made, but sold by vestureofblood (also a BLF member). The shipping costs do not make this driver any cheaper than via Mtn El.

hannesremo
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no it does not, but we’ll see. How about a direct drive, straight from battery, would lose all modes,but ?

hannesremo
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if I used 2 18350 10amp high drains, keeppower?

djozz
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direct drive will work fine, but all the risk handling is transferred to the user (no low voltage protection, no reverse battery protection: led will blow instantly when battery is inserted the wrong way), and there’s just one mode.

I have made flashlights like that but in practice they see no use, I use lower modes way more often than full blast.

hannesremo
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maybe I like it dangerous, haha, It would just be for a short amount of time, I like to run higher modes usually. I already have made some direct drive ones with single modes and they work fine.

LightRider
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I believe the BLF driver can be modified to operate at two cell. LDO + resistor mod. Someone correct me if I’m wrong. I’ve only done it with amc7135 drivers.

hannesremo
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how would I do that though? It has a fet and one 7135, how do I add the resistor and where? What’s ldo a diode?

djozz
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LightRider wrote:
I believe the BLF driver can be modified to operate at two cell. LDO + resistor mod. Someone correct me if I’m wrong. I’ve only done it with amc7135 drivers.

That is coincidently what I tried a week ago, but not with a LDO but with a zener diode: the so-called ‘zener-mod’ on a BLF-A6 driver. It did work in the sense that it did drive an XHP70 led in 2S configuration without killing the MCU, but the user interface and timings were completely messed-up so it was un-usable.

A zener mod on a 105C driver works well, with the user interface un-altered, but the low voltage protection kicks in at a too high voltage, at about half drainage of the cells.

hannesremo
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just found an ld3 driver here on blf, and it’s in eu whohoo, this will be awesome.

djozz
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hannesremo wrote:
just found an ld3 driver here on blf, and it’s in eu whohoo, this will be awesome.

You are right, forgot about the LD3 (and I even tested it Facepalm ) , that is a great option too! Don’t forget to order it in 2S configuration.
hannesremo
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can you run it of a single hg2

djozz
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hannesremo wrote:
can you run it of a single hg2

An XHP50 runs on 6V, a single li-ion is half of that. A driver that will do that is a so-called boost-driver. The LD3 is not a boost driver, so the battery voltage needs to be a bit higher than the led voltage.

Btw, single cell boost drivers for 6V leds usually have a limited current, you will not get the output of a lineair/direct driver in a 2S configuration.

hannesremo
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allright, thank younso much!

Jerommel
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Hmm.. The LD3 is 3 or 6 amperes…
Can it do 4.5 Amperes?

Looking for:

5” parabolic reflector (for recoil light)

djozz
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Jerommel wrote:
Hmm.. The LD3 is 3 or 6 amperes…
Can it do 4.5 Amperes?

If you read the LD3 info thread, you will find that a new feature in the LD3 is that there is a user configurable adjustment of the maxium output current, down to 2A off the listed current. So the 6V version can be configured down to 4A.
hannesremo
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I saw the same on ebay, and apperently it has options of
3A,6,9,12A, and you can change it in the ui.
2-3A, 4-6A, 7-9A 8-12A

Jerommel
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djozz wrote:
Jerommel wrote:
Hmm.. The LD3 is 3 or 6 amperes…
Can it do 4.5 Amperes?

If you read the LD3 info thread, you will find that a new feature in the LD3 is that there is a user configurable adjustment of the maxium output current, down to 2A of the listed current. So the 6V version can be configured down to 4A.

Yeah, i just read that.. Facepalm

Thanks. Thumbs Up

Looking for:

5” parabolic reflector (for recoil light)

hannesremo
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No worries!

hannesremo
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what would be a good output for the xhp50 then, considering I’ll be putting it in an s2+ or thorfire vg-10, maybe eagle eye x6, one of those? Maybe the 4-6 amps? sure you wouldn’t want to push up towards 12 amps?

Khuan
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I just did a single cell MTG2 on my S2+.. The boost driver is 20mm and outputs 3A (stated on the site but i dont have meter to test it) which i believe is more than enough for a small light. I cant find any 1 to do custom pill for me so what i did was sanding off 1mm from the original pill, cover the components using wire tape (because the pill internal diameter is a bit small so i had to protect the component from contacting the wall) n let it sit on top of the pill. Still hope someone here can custom made a pill for me and it will be perfect.

hannesremo
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nice! Does it get hot at all Big Smile I ordered some copper plate to make my heatmanagement better.

Khuan
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Yea of course! It a 6v emitter on a small body… its also flooder than XML2 but XML2 had alot brighter hotspot…

Jerommel
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Khuan wrote:
I just did a single cell MTG2 on my S2+.. The boost driver is 20mm and outputs 3A (stated on the site but i dont have meter to test it) which i believe is more than enough for a small light.
Do you have a link to that driver?

Looking for:

5” parabolic reflector (for recoil light)

hannesremo
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Just type in mtg2 driver on aliexpress.

hannesremo
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Ld-29s driver? 20mm 3amps!

Khuan
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hannesremo wrote:
Ld-29s driver? 20mm 3amps!

LD-29 requires 2-3 cells, they are not boost driver.

Jerommel wrote:
Do you have a link to that driver?

Sorry for the late reply, here it is: https://item.taobao.com/item.htm?spm=a1z09.2.0.0.3Hw9hg&id=525791737301&...
They are the only 20mm single cell boost driver for MT-G2 or XHP50 as far as i can tell..

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