Convoy 17/22 mm SST40 Driver temperature protection removal

Wow, so bad?

I have to replace the driver in my nephew's S2+, torch predominantly used with the short tube, guess I won't mess with thermal throttling in that one. The other driver, though, is another story.

Hello guys
What about the Convoy M3 driver ?
How can i remove it?

Maybe this thread helps, driver might be sonewhat different though

The M3 has different driver, I’m not sure I find it correctly =((


I think i found it =D

Good info. I just ordered a few of these and I’m sure I will do this mod.

These drivers with the stepped modes look like constant current linear mode FET drivers like led4power’s. Is the other ‘ramping’ driver from convoy mentioned above also this type of driver? The description and UI seem strange. Is the current limited to 8A?

Hi Barkuti & folks,

Can I ask, where is the sense resistor on this board to be sure?

I have ordered the 20mm board 6A version which I supposed is the same as the 17mm/22mm one. Would you be so kind to show me where it is? thanks

Look at your link picture and it clearly shows R010

The sense resistor is that big R010 chip resistor onboard, down there in this photo:

That looks to be 2010 imperial size.

Thanks for the reply, Guess what? I have bought the 1210 sizes and its on its way! Haha, I read it off other threads of the similar driver but in a 17mm size I think?

Since 2010 size is 5mm x 2.5mm and 1210 is 3.5mm x 2.5mm, I suppose this allows me to join two resistors serially to lower the output (which was my main objective anyway).

I actually do see another R010 on the board, at the left side of the 10pin IC. Could that be the sense resistor as well? Regs

The sense resistor is the small black one at the very right of the board in that pic; “north east” of the MCU

Oh thanks for the double confirmation. Looks like I will be having a tough time trying to fit 1210 resistors there :smiley:

I don’t think you’re correct. Barkuti has modified these boards before so I’d be more inclined to trust his answer

Oops sorry I was thinking about the thermal resistor. Brain dead lately.

Apologies everyone, barkuti is right. I’ve done the mod on those sense resistors myself.

Anyone know which component is the thermal resistor on the 17mm driver of post #6? (bottom picture). There’s two components within the drawn cicle

The upper one Funtastic. I could also say the rightmost one, and so it is valid for both top (∅22 mm) and bottom (∅17 mm) driver pictures.

Awesome, many thanks

20mm driver: 2.07€ 69% OFF|20mm Fahrer für SST40 ,4 modi 0.1% 3% 30% 100%, max strom ausgang 6000mA, Temperatur schutz management innen|Taschenlampen| - AliExpress
AON 7220 Mosfet: AON7220, AON7220 Datasheet, AON7220 PDF - Alpha & Omega Semiconductors

Strange though, when looking into the datasheet of the MOSFET, it seems like the big R010 resistor is connected to the Source terminal of the MOSFET (the first 3 pins of the MOSFET are tied together). The Gate pin on the other hand is not connected to the R010, it goes under the MOSFET (or under) to another location. We can see that all the remaining pins on the right side of the MOSFET (4 pins) are connected together as the Drain terminal, which means the datasheet is correct to the MOSFET used here.

I m not good at electronics. Does the Gate terminal connect to the “sense resistor” to bias the Vgs?

Can i just remove the temp thingy with a soldering iron? Do i need to bridge something after removing it?

Yes sense resistor is connected to the source, the linear driver is exact the same as typical Electronic load circuit Simple Electronic DC Load - Codrey Electronics