Anyone recognize this buck driver?

10 posts / 0 new
Last post
eas
eas's picture
Offline
Last seen: 50 min 38 sec ago
Joined: 07/14/2014 - 18:53
Posts: 1007
Location: PNW
Anyone recognize this buck driver?

I pulled this buck driver out of a cheap, low-quality 1-2s JM05-style light.

I plan to replace it with…something else, once I find a good combo of emitter and driver for the light.
In the meantime, I wonder what, if anything, I can do to make this driver more interesting.

Does anyone recognize it? If so, do you know of a source for more info on it, or a common name for it, to make searching easier and more fruitful. Or, barring that, info on the components, or similar drivers?

I’ve come at it from a number of angles myself, but so far, I haven’t turned up anything.

Thanks!

Too many streetlights, not enough flashlights.

TBone
Offline
Last seen: 4 hours 36 min ago
Joined: 01/27/2016 - 16:42
Posts: 259
Location: Europe

What is the diameter?

eas
eas's picture
Offline
Last seen: 50 min 38 sec ago
Joined: 07/14/2014 - 18:53
Posts: 1007
Location: PNW

Doh! 22mm

Too many streetlights, not enough flashlights.

WillyD
Offline
Last seen: 3 weeks 4 days ago
Joined: 10/10/2012 - 15:55
Posts: 721
Location: Ohio

I’ll have to check my box ‘o drivers, but that seems to look like one I pulled from an old Trustfire a few years back and replaced it with a buck driver from MTN. I’ll check my box and see if it matches up.

cera@1967
Offline
Last seen: 1 day 9 hours ago
Joined: 11/19/2013 - 14:45
Posts: 304
Location: Romania

 The driver is not as bad ! The fet ( 9926 )  , can stand up to 6.5 A in continuous duty (!) , only the fly back diode and the inductor  are on the small side .., changing the SS24 with a SK 54 and the inductor  with a bigger one , could give you  at least 4.5 A to the led ( of course , reducing the sense resistor R100 , with some resistances  , placed in parallel ...) . You will be surprised how robust it is ...

Adrian

eas
eas's picture
Offline
Last seen: 50 min 38 sec ago
Joined: 07/14/2014 - 18:53
Posts: 1007
Location: PNW

Thanks for the info, Cera! The inductor and shotkey did look like weak links to me. I may try swapping parts and paralleling sense resistors at some point.

Too many streetlights, not enough flashlights.

NoEcm
Offline
Last seen: 1 month 2 weeks ago
Joined: 06/24/2018 - 23:41
Posts: 2
Location: seattly

Any ideas on how to modify this driver so that it only operates in single mode (high)?

Lightbringer
Lightbringer's picture
Online
Last seen: 2 min 14 sec ago
Joined: 08/30/2016 - 14:12
Posts: 5442
Location: nyc

Got a ‘scope?

If you wanna go cheap, goggle DSO138 and pick up one.

Then, once fired up, you can poke the pins of the µC when it’s in medium modes (with PWM), and see which pin bounces up’n‘down at a few kHz. Crowbar that to whatever represents full-on.

Kinda like crowbarring the common enables of all the 7135s on a 105C and the like to bypass the µC and force it full-on.

Of course, by doing that you’ll also disable LVP and the like, but…

09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

NoEcm
Offline
Last seen: 1 month 2 weeks ago
Joined: 06/24/2018 - 23:41
Posts: 2
Location: seattly

Sorry, no scope and the last time I used one was 55+ years ago in my High School electronics class. I’d swear that the last scope that I used was a WWII surplus unit that had vacuum tubes in it. Big Smile

Lightbringer
Lightbringer's picture
Online
Last seen: 2 min 14 sec ago
Joined: 08/30/2016 - 14:12
Posts: 5442
Location: nyc

20bux for the ’138 (w/ leads), 10bux for a case, you’re set. Get the “welded” version that’s complete vs a kit.

Lets you poke’n‘prod to your heart’s content.

09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0