Yeah, thanks Jon. I can see that on my own.
I was referring to it looks like that team isn’t there any more to update it and it’s all on TK and Neal now.
Won’t ask again.
Current status: Trying to get answers. Attempting to pull something solid out of the cloud of possibilities, so there can be a more concrete plan and schedule. Most of the remaining tasks depend on Neal nailing down details and making commitments.
Aside from trying to get answers, about the only task for me right now is to build new firmware with the latest updates, test it on proto2 for a few days, and send it for production to use.
This keeps most of the levels pretty stable and reasonably efficient, as far as linear drivers go. But it still has a direct drive circuit for turbo.
In a totally non-scientific qualitative manner, the overall efficiency curve compared to a constant current linear driver looks something like this:
LEDs also change tint according to the power level. This driver attempts to minimize that effect by blending power channels, but it may still be noticeable. The curve for that looks roughly like this:
If I remember to, I suppose I should probably put this info in the first post somewhere.
The color can be effected due to the power delivery. The FET is full power, many amps, and uses PWM which pulses the full power to create the lower brightness levels.
The 7135 limits current, it only allows 0.35A through. So when it’s using 1 or all the 7135 chips fully, there is no pulsing or PWM and the color is slightly different.
It’s a bit complicated for me to follow, but the tint does shift slightly based on the type of power delivery to the led.
Joking aside, my experience is large suppliers like this can usually provide quotes on items they deal with regularly in hours to a day or two during their regular hours, and if they have to work directly with a manufacturer on a special order of something that requires a little bit of special effort, it’s usually not more than a week.