Convoy 17/22 mm SST40 Driver temperature protection removal

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Yokiamy
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Convoy 17/22 mm SST40 Driver temperature protection removal

Hi BLF-ers

Simon is selling this driver:

https://nl.aliexpress.com/item/33024197621.html

I have it in my L21a and was wondering if it is possible to address the NTC or PTC or whatever temp measurement component is used.

I like the 4 mode driver, but the temperature management is set to 55 degC, and i would like to bypass it or adjust the setting. (Or remove the component if possible)

Does anyone have experience with this driver and doing so?

EDIT

Thanks Simon ! (For those not familiar, he is the owner from convoy.aliexpress.com)
See posts below how to remove the temperature stepdown / temperature protection of the SST40 drivers which Simon sells

Regards P.

  BLF

Edited by: Yokiamy on 08/21/2019 - 10:07
Sirstinky
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I bought the FET version of this today in 17mm since it runs the LED harder than this version can. I don’t know if it has a eprom on the UI like the one I got. It might be built into the ic.

Yokiamy
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So, i just asked Simon [the official owner of Convoy @ convoy.aliexpress.com] and he answered me with the following images in This thread

So tonight i had to find out whether it was actually a PTC or NTC, to remove the item or make a solder connection between the pads.
To find out i measured the component Simon pointed out at room temperature which gave me around 90K, after warming up the driver with my wife’s blow dryer the resistance dropped to 35K.

So i desoldered the NTC and did a second second test on only the component (which gave different readings ofcourse, since measuring resistance in a loop is actually a no-go)
No load resistance gave me 105K and after heating up with the blow dryer gave me around 35K (it raised quite fast, that’s why the picture shows ~60K)

Now the light gets hot after a few minutes, which means, mission accomplished, now i have an L21A without temperature protection!
I LIKE IT !

Removed the NTC

  BLF

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Good job Yokiamy, i am interested in this mod also but i cannot see the pictures in the Convoy tread. Is it possible to reupload them to imgur, please?

 Olight i3s, Olight S1, Olight S Mini, JetBeam Jet-1, BLF 348, Astrolux S41S, UF SK-98, Convoy S2+ 3*XP-G2, Convoy S2+ 3*XPL, Convoy S2+ 219CT, Convoy M1, Convoy C8, Brinyte B158, Courui D01, Convoy L6, Noctigon M43

Yokiamy
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BobbyMK wrote:
Good job Yokiamy, i am interested in this mod also but i cannot see the pictures in the Convoy tread. Is it possible to reupload them to imgur, please?

Somehow the images don’t showup on imgur, if you exchange email by PM, i can send them to you. Maybe you can try to share them after you received it

  BLF

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Sure, PM sent.

Edit:

Got the pictures, if anyone has the problem of not seeing them in the Convoy tread, here they are:



To be honest i did not think that it would be as easy as removing single NTC resistor, gotta fix my C8 now. Smile

 Olight i3s, Olight S1, Olight S Mini, JetBeam Jet-1, BLF 348, Astrolux S41S, UF SK-98, Convoy S2+ 3*XP-G2, Convoy S2+ 3*XPL, Convoy S2+ 219CT, Convoy M1, Convoy C8, Brinyte B158, Courui D01, Convoy L6, Noctigon M43

Yokiamy
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Me neither, but in Dutch we have a saying which may not sound as good in English, but it’s something like:
Not tried is always wrong.

So i just tried to ask Simon, and he was willing to help (and it was actually dead easy)

  BLF

oweban
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“You miss all the shots you don’t take” would be a pretty good alternative Smile

Yokiamy
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oweban wrote:
“You miss all the shots you don’t take” would be a pretty good alternative Smile

That’s even better!
In Dutch we say, nooit geschoten is altijd mis!

  BLF

hodor
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Thanks for this, very useful info! Beer

Funtastic
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Just buy the Ramping driver, it’s much better

Texas Ace Lumen Tube calibrated with maukka lights

Yokiamy
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Funtastic wrote:
Just buy the Ramping driver, it’s much better

can you give a substantiation?

Now it just sounds like a personal preference, without explanation

  BLF

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Interesting, understandable, logical. The temperature protection gets activated by the resistance reduction in the NTC. If the NTC is removed the resistance “gets high” and cannot change. The temperature limit is thus removed. 

Concerning the ramping driver, I modified a ∅22mm unit for a little bit more current (8.8A theoretical, 8.1+A measured) and two ∅17mm units for less current (5A and 4A, hitting ≈4.75A and 3.8+A when measured). The ∅17mm unit set for 4A had a small problem, with the first seconds of the ramping unseen and the 3rd mode setting clicks also unseen. Couldn't investigate the issue, the flashlight was for a colleague and he came home, got it and went away despite the thing.

The ramping driver has a weird UI which may not be everyone's liking.

Funtastic
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Can you explain how you made the ramping driver less current? Would it be possible to run at 3A for an XML2? If you had to swap out chips then I won’t be doing it

Texas Ace Lumen Tube calibrated with maukka lights

oweban
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I like the 6A driver but wish I could make it ~7.5 – 8A :/

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Funtastic wrote:
Can you explain how you made the ramping driver less current? Would it be possible to run at 3A for an XML2? If you had to swap out chips …

By swapping out the sense resistor stack. Comes stock with 5mΩ, this means 40mV theoretical (I = R × V) although it is a bit less in practice (MOSFET temperature has to do with). I added an R050 on top of the stock R005 in the “8.8A” set ∅22mm driver which ended up measuring 8.1+A. Concerning the smaller drivers I installed two stacked R020s the one set for “4A”, and for the one set at “5A” I went with an R010 plus R050 plus R200.

For 3A effective a couple R025s may do. 

Satan@103TFS
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@Barkuti what do you think if I just bypass “5mΩ” with the wire to run XHP50.2 3V I’m not sure if it a good ideal.

oweban
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Barkuti, which component is the sense resistor stack? I think I see the R005 on the ramping driver, but do you know which it is on the 6A driver? I assume R010?

So what I’m understanding is that more resistance = higher amperage… Now to work out the right number to hit ~7.5A Smile

Edit: I’ve found a similar driver to the 6A one, but this is apparently 7A: https://www.aliexpress.com/item/33005190273.html – looks like it uses R015, but there’s a few other components of different values, too.

Yokiamy
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oweban wrote:
So what I’m understanding is that more resistance = higher amperage… Now to work out the right number to hit ~7.5A Smile

No, by adding the same resistor on top, your total resistance will be half of the value.
(Electronics series parallel basics) This will increase current output, many people did this with the L6 resistor mod (R100 or R120)

  BLF

Barkuti
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Satan@103TFS wrote:
@Barkuti what do you think if I just bypass "5mΩ" with the wire to run XHP50.2 3V I'm not sure if it a good ideal.

If you do that the driver won't be able to regulate at all. This means no ramping and no modes. I haven't tried it, though.

You still need to tweak the sense resistor stack value for it to work. You could try an R004 on top, it could work well or it may not. Add some heatsinking to the thing in such a case, as you'll be above the maximum power rating for single 1206 resistors (a couple stacked one doesn't changes this significantly). A good mound of thermal glue above sense resistor and MOSFET could help.

oweban wrote:
… I assume R010?

So what I'm understanding is that more resistance = higher amperage... Now to work out the right number to hit ~7.5A Smile

If the driver uses R010 for 6A this means sense voltage is Vsense = R × I = 10mΩ × 6A = 60mV. If you want to add 1.5A, you need Rextra = V / I = 60mV / 1.5A = 40mΩ or an R040 in parallel with the existing R010.

I have not measured how that driver behaves actually but if you really want to be sure to hit 7.5A, add some more conductance is my advice. I'd look for an R030, which would raise the maximum current to 8A theorerical (6A + 2A), albeit it would leave the actual figure in close proximity to 7.5A effective due to MOSFET heating, imho.

oweban
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Thanks to you both Smile I did some electronics courses a very long time ago, so I’ve basically forgotten everything I ever learned…

Will buy that driver today!

Anthon
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Is it possible to do this with the 17mm version?

oweban
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Yep, just gotta do the calculations and get the right resistor. Looks like an R010 on it, and max of 5A. Depends on how far you want to go, as to what you need:

6A total: Add an R050
7A total: Add an R025
7.5A total: Add an R020

And I don’t suggest going much further than that Smile

Anthon
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oweban wrote:
Yep, just gotta do the calculations and get the right resistor. Looks like an R010 on it, and max of 5A. Depends on how far you want to go, as to what you need:

6A total: Add an R050
7A total: Add an R025
7.5A total: Add an R020

And I don’t suggest going much further than that Smile

I was meaning removing the NTC on the 17mm version to disable thermal management

oweban
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Oops. Sorry, forgot that’s what the thread was about.

I believe this is the 17mm driver:

It’s the bigger one in that circle (at the top of it).

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Thank you guys!!
The only thing that was turning me away from this driver was the overaggressive thermal throttling!
Now a way to get a bit for regulated current out of it? SWEET

Anthon
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oweban wrote:
Oops. Sorry, forgot that’s what the thread was about.

I believe this is the 17mm driver:

It’s the bigger one in that circle (at the top of it).


Thank you!!

Just ordered one driver for my Convoy M2

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oweban wrote:


I have a couple ∅17mm units right here, I can confirm the matching board layout.

 

KnHawke wrote:
Thank you guys!!
The only thing that was turning me away from this driver was the overaggressive thermal throttling!
Now a way to get a bit for regulated current out of it? SWEET

Overaggressive throttling? Could you or someone else explain this a little bit better?

Anthon
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Barkuti wrote:

oweban wrote:



I have a couple ∅17mm units right here, I can confirm the matching board layout.


 


KnHawke wrote:
Thank you guys!!
The only thing that was turning me away from this driver was the overaggressive thermal throttling!
Now a way to get a bit for regulated current out of it? SWEET

Overaggressive throttling? Could you or someone else explain this a little bit better?

We’re near, I’m from Molina de Segura, Murcia Big Smile

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Barkuti wrote:


KnHawke wrote:
Thank you guys!!
The only thing that was turning me away from this driver was the overaggressive thermal throttling!
Now a way to get a bit for regulated current out of it? SWEET

Overaggressive throttling? Could you or someone else explain this a little bit better?

In what reviews I spotted of the SST40 based S21A, when you engage Turbo Mode, it almost immediately starts stepping down, pretty much negating anything useful of that mode.

oweban
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I might do a runtime test of my S11 w SST40 that I’ve taken to 7.2A…

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