Yeah, the MCU Pin used for PWM would be determined by the firmware.
I didn't see the other 3 legs of that component due to shadow in picture. I'm not familiar with that marking though. Could you clean up the driver with alcohol and then take a picture of each side with light behind it. It would make the traces stand out.
It looks like the top right Pin of the MCU (In 2nd picture) maybe the PWM out. The PWM out should go into one of the Pins of the Buck Controller and then a different Pin on the Buck Controller should feed the Gate Pin to your MOSFET. The Gate Pin of the FET should be the right pin when your looking at it with the big tap pointing up.
EDIT: I take that back about the top right pin of the MCU. I think I see a trace for that Pin also going to that Capacitor. Maybe that Pin is Vcc. Maybe better pictures will help answer some questions.
Which Pin does the data sheet say is Vcc? Is Ground the bottom right Pin per the data sheet?
Oh, that looks very nice. The tint looks much better at the current. Did you change the camera settings? You should be proud of that light. Really has a smooth beam profile. Congrats :)
I think your idea for using the scope is very good. I wish I knew how to use one. Check all the pins (except Vcc and Gnd) on the MCU and also on the 6 pin "buck controller".
This is what i got from my scope
Upper picture = Output MCU
Lower pcture = Mosfet gate input
Low Mode
Medium Mode
High Mode
Yes, you right ImA4Wheelr
Those MCU only “pull up” output to approx 5V (scope at DC coupled)
So if i jumper those pin to V+ (lets says i’m feed it with 15V supply), its will be fine ?
s
Camera setting still same, ISO 400 ; F/3.5; 1/4s IIRC
^ I agree with FF. You definitely don't want to feed 15v. You want the Vcc for the MCU which should be in the 3 to 5 volt range. Nice work. I need to learn how to use a scope.
You got it bro. Jumper MCU pad for Pin 1 to the MCU pad for Pin 4. Keep or pull the MCU, which ever you prefer. Nice mod work tjeret. Great DIY attitude and initiative. Glad you joined BLF.
Any plans to increase current further?
EDIT: Wonder why Pin4 and Pin 5 have a jumper. Trying to look at the trace for Pin 5, but can't make it out. Are you counting the pins like this?:
Ok will try to remove those MCU
Those pin 4 and 5 already have a jumper as default configuration
i don’t know if output MCU can be parallel
yes i count like datasheet
Look like i’m good with those 4.2A
modification to heatsink for higher current will be PIT*
s
I accidentally pull a trigger for K40M couple week ago after testing the output Solarforce K3
because i thought this one will not be a good “thrower”
Hopefully it will arrive soon and will try to crank current little further
No need to remove on my behalf. It should be fine with it. If you do remove, I suggest a cheap hot air gun (not a hair drier. I think you know that but other readers may not). If you do, please try to get a back lit trace picture.
tjeret wrote:
Those pin 4 and 5 already have a jumper as default configuration
i don’t know if output MCU can be parallel
Me either. A good trace picture of each side would help.
tjeret wrote:
Look like i’m good with those 4.2A
modification to heatsink for higher current will be PIT*
Sounds good. I know where you are coming from.
tjeret wrote:
I accidentally pull a trigger for K40M couple week ago . . .
ah, huh, accidentally. I've accidentally pressed the "buy" button and accidentally input the payment information too. clumsy fingers.
Nice looking driver mod there. So the pad for Pin 5 goes to nothing. My guess is that Pin 5 on the MCU was the actual PWM out. So they had to bridge it to Pad 4 to feed the buck controller.
It was a real pleasure collaborating with you and FrickelFreak on these mods. You should be proud of your accomplishments on this light. You demonstrate some fine craftsmanship. Looking forward to seeing what else you come up with in the future.
I put back two 0R27, now current around 5.7A
with 1 minutes operating those tiny driver is very hot
Unfortunately still can not reach those K40M :_(
I’ll stop with 5.7A
Congrats again tjeret. Pushing the poor little driver hard now.
I'm not aware of any good buck drivers that get much over 5 amps that are under 26mm diameter. There are a couple great minds on BLF working on diy solutions for that but it seems to be quite a challenge.
That driver of yours looks quite small for 5.7 amps. What diameter is it?