Yeah the driver changes to DD when the voltage drops
The resistance of the coil and FET in this case is pretty low with 27.4mOhms
As well as 28mOhms for the sense resistor
So at 8A the voltage drop of buck parts is only 0.44V which is good for 4S
The main advantage of the this regulator chip is the low dropout voltage of the boost part
What about when it is switching to reduce the output voltage? Say I have a 4s battery with a 9V emitter. What is the max current that could be sent to the emitter before burning up the driver components?
What about 3s battery with 6V XHP70.2. What is the max current it could send to the emitter? Could it do 12A? Sorry if that is a dumb question but I’m not as familiar with buck drivers.
8A is pretty much the limit, above that current the power loss on the shunt gets an issue, as well as the FET at
The Buck chip uses a special method to detect the current that is differential measuring the inductor ripple as well
I could get the shunt reduced as well as limit the 0-1.24V PWM input value, this needs also a new ramping table on the moon modes
On the other hand I would have to reduce the inductor value as well to get the ripple increased
Also slowing Buck frequency even more to get less switching loss on the MOSFET, for that I have to order bigger lower voltage capacitors
Anybody jave beam shoots by anychane? BtW, lexel, track8ng says the driver just hit new york. Few more days until i get it.maybe I’ll be the one posting the beam shots.
Beam shots...... I just now finished my MF02 70.2. If lexel was here I'd give him a huge hug :-) this thing is absolutly nuts. Running lexels amazing driver, SLICED XHP 70.2 P21A 12volts 8 amps 7450 Lumens after 10 seconds
VS
Mateminco MT35 with a xhp35 E21A 18 AWG wires, stock driver 2280 Lumens after 10 seconds
Distance is 55 feet. Pretty self explanatory. One pair of the beam shots is with manual seetings and one other pair witis with auto camera settings.
Ya, I think I can, I have only measured LUX on smaller throwers from 3 meters away. I’m still a little confused what the proper/Ideal distance should be for large reflectors throwers (70mm in this case) I should be farther away from the sensor? 10 meteres? What’s the ideal distance for the BLF GT? I’d like to measure my GT before and after a (xhp35 E bin 6000k) swap also.