yep exactly, do you think it is possible??
It's certainly possible; it's pretty simple. Just connect a piece of wire like this:
I posted more detailed information on this Convoy driver here: https://budgetlightforum.com/t/-/61809
It uses the MP3431 chip, and works really well.
I include schematic, board layout, and testing results. I invite anyone in this thread to check it out if youāre interested.
Hey man, thanks alot for the answer;
Since Im a total newbie, I have here a magnified picture just to make sure I got it right, please confirm!
Very impressive and deep analysis of the driver in the linkā¦congratulations;
Well I wasnt expecting so much info ā¦but since you are here,please tell meā¦ is it possible to boost the amps keeping 12V, instead of 6v like you modded in the provided link??
I mean, possible for a normal person with poor smd soldering skills.
thanks
Yep, thatās right. Thatās the simplest thing to do to make it fixed 100% output.
As for increasing the current at 12V, it is definitely possible with this driver, but Iād be cautious about why you need to.
If you want to drive a 12V XHP70, then yes, I could give more advice, but for an XHP35, there is no need to increase output current. Any more will kill that LED.
Finally, I solved the case.
Not the most elegant solution, but it works.
I skipped the 3V XHP50.2 and returned to a 6V version, and replaced the 10mOhm current sensing resistor to a 20mOhm one.
The output current is halved now in each mode and stable in the entire battery discharge range. No more inductor whining and current rush.
However, since 6V and not 3V LED is used, the LED Vf is very close now to the battery voltage in high and turbo mode when the batteries are almost discharged, so the current path in the whole flashlight should provide the lowest possible voltage drop.
Has anyone managed to mod any single cell boost driver (for 6v leds) with an e-switch?
The only commercial model I found was this one on taobao.
But itās UI is pretty bad, and it is too big for my build.
Convoy recently introduced some 17mm buck and boost drivers, supplied with their 12-group selectable interface.
Did somebody used any of them yet?
I have a few of the 6V 17mm drivers. Iām still experimenting with 6V LEDs to see what I like. Pretty fun to put say an XHP 50 into a Convoy T3.
Iām really interested to see the buck driver efficiency compared to the most similar older 3V, 12 mode group, driver.
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Old 12 mode group driver used 7135 LDOs. This new one is a buck driver. The efficiency should be better.
I hope the output is stabilized.
I had some 17mm buck drivers from KD earlier but those could not stabilize the output from 1 cell supply.