Hi TK,
thanks for weighing in (and just here and now: thanks for your wonderful FSM/Anduril).
Admittedly I’m very keen on gchart’s “Test 15” in his post https://budgetlightforum.com/t/-/55911/29
32 kHz
TCD, 10 bit
20 MHz
19.53 kHz
970 uA
10-bit at 20 kHz with 1mA looks like the sweet spot.
Last summer I spent some time to improve the ramping table for a 1+12 7135 driver. With a luxmeter and handmade graph I got the step between 1x7135 and Nx7135 virtually invisible, so I could get rid of the intermediate blink. I understand why this can’t be done on a commercial driver and the intermediate blink is a very ingenious cover (especially for FET+1 drivers). But it’s so, sooooo marvellous to have a nice and smooth ramping all over the range, it was so much worth the effort.
But on the lower end it has still room for improvement with either very visible steps (doubled or tripled pwm values) or it is too steep. 10-bit would smooth this curve very nicely.
From a driver design perspective this could be done with still 2 pwm channels and this might be preferable for smaller drivers and to minimize the numbers of pwm seams.
But I’m sure a change to the Attiny 1-series will introduce a lot of possibilities for a variety of drivers so admittedly I’d be just happy if we can get this going with the basic stuff (2x pwm, some aux, a switch) and improve from there.