A driver question for the experts

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Spasmod
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A driver question for the experts

Please bear with me on this, I’m not expecting to get any answers but it’s worth a shot incase one of the resident electronics experts has an idea.

Before I start, let me just say that this is a photoshopped image. I couldn’t find a picture of my driver, but found one very similar but with a few extra components, so I shopped them out.

In the image below, what you will see is Exactly the components I have on my driver board. There is nothing on the back of the driver.

It is a 3-mode driver. If I connect the LED negative to OUT- I get 1.4 amps (tailcap), if I connect LED negative to OUT1- I get 2 amps (tailcap).

What I would really like to do is find a way to remove the strobe mode. I like having high and low but not strobe. If I have to live with Only High, that’s not a problem either but I really want to get rid of strobe due to the (turntailcap) nature of the on/off arrangement in this light.

Thanks in advance but I’m not holding out much hope Big Smile

Furthermore, is that CX2829 IC likely to be this ? (or a clone of some sort)

http://www.ti.com/product/tps2829

Edited by: Spasmod on 02/01/2013 - 12:38
Major
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Hi I think I’ve seen this ic in another thread somewhere I might be wrong tho. The strange thing is there’s no mosfet to switch the led assuming the cx2829 is a microcontroller of some sort. Unless this is a master that drives a remote slave board.

Edit: Google just found this driver

Not the same as yours but mentions the ic.

Vieplis
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Spasmod wrote:
… is that CX2829 IC likely to be this ?

No.
Spasmod
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Major wrote:
Hi I think I’ve seen this ic in another thread somewhere I might be wrong tho. The strange thing is there’s no mosfet to switch the led assuming the cx2829 is a microcontroller of some sort. Unless this is a master that drives a remote slave board.

Edit: Google just found this driver

Not the same as yours but mentions the ic.

Thank you Major, very useful indeed. The funny thing is though, there isn’t a power transistor on the board. I’m suprised they’re using this chip on it’s own. (I’ll double check that I’m not losing my mind and missed it) Big Smile

Spasmod
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Vieplis wrote:
Spasmod wrote:
… is that CX2829 IC likely to be this ?
No.

Dang! thanks though Vieplis

Hopback
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The driver in the keygos m10 I received looks very similar to this, but it has more resistors on it. I will dig it out of the parts bin over the weekend and try to rid it of its evil flashings. Im no electronics wizard though Wink
Woody

Spasmod
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Hopback wrote:
The driver in the keygos m10 I received looks very similar to this, but it has more resistors on it. I will dig it out of the parts bin over the weekend and try to rid it of its evil flashings. Im no electronics wizard though Wink Woody

Thanks Woody, that would be great if you manage to figure it out. I’ve double checked and there really are no other components on the board apart from the one’s shown in the picture.

That’s what I call a budget-budget driver lol. It’s had a fair bit of use and hasn’t blown up yet though, so I’ll push on with it while it lasts.

Hopback
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After a bit of clueless fiddling Ive got rid of the flashing, sos-ing, low and high mode… just leaving medium-ish Sad

Its not in the parts bin any more, its in the bin!

Woody

driveX
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I have been searching for it for quite a long time and most likely it is a PAM2805. It is being used in many lights.

http://www.poweranalog.com/products.htm#led

Spasmod
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Hehe, thanks ever so much guys for your efforts. I’ll just stick with it how it is I think until it goes bang Big Smile

Cheers

Spas

JackCY
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Keygos M10.

CX2829 is an IC
MEM2309 Series P-channel enhancement mode field-effect transistor is a MOSFET

The resistors are there to buck down the current.
I think I could just connect the LED to OUT1+ and get a direct drive through the mosfet without the buck resistors.

I’ll try to reuse this for another project will see if it will work on double AAA Big Smile

From fonarevka:
Saik SA-9

CX2829 can be something like PIC10F220.

Though how do these other lights work at those high currents I have no freaking idea.
The Keygos M10 has a power mosfet to handle the switching.

Spasmod
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You found it! JackCY

That is the exact driver I have. I too am bemused how it can run at 2A (that’s what it was running before I swapped it) with no mosfet.

It’s still running just fine btw, but now driving a XP-G so not so much heavy duty workload Smile

JackCY
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I think it may be some programmable switching thingy.
Does it get hot at 1.4-2.0A?

I’m mainly looking for something that will switch 0.35-1.0A but at 1.5-3.0V. So AMC7135 can bite the dust…

CX2829

1 Vcc 2 4.7uF to ground 3 10kOhm to Vcc and to control Mosfet MEM2309
4 Ground 5 Ground 6 Ground

MEM2309

1 Out 2 Out 3 Out 4 Out
5 Vcc 6 Vcc 7 Vcc 8 Input/Control

I think the CX2829 grounds the control pin, so it grounds the input pin of MEM2309. When not grounded it is connected via 10kOhm to Vcc.

I could just bypass the CX2829 and control the input of MEM2309 directly and get high mode only.

You can’t since everything is hardcoded into the CX2829.

The modes of my driver are: 5, no memory: High 100%, Medium 50%, Low 13%, Fast strobe, SOS.

And the resistor network is 8× 1.5Ohm parallel = 0.1875Ohm total. And that along with the MOSFET resistance brings the voltage down and the output was 1.8A on high.

NeilP
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I have these questions too, on some Singfire 18650 lamps.

Same chips
CX2829.
MEM2309 1247

The modes of my drivers are: 5, no memory: High 100%, Medium , Low , Fast strobe, SOS.

both boards have identical brightness output by eye driving XML T6 emitters

I too would like to get rid of Strobe and SOS, Ideally add last mode memory too. or a least have low com on first.

Probably just as easy to swap out the driver board, but would like to know if surgery on these is possible.

The thread with more info on these lights is here

16mm board

20mm board

From Jersey, the Island, not New Jersey, but old Jersey..the real one Wink