I am wishing to control different clusters of LEDs.
Each cluster can have a different number of LEDs in its string, for example, one cluster might have 8 in series and another only 4.
I was thinking of driving with a MAX16384 (constant-current, boost configuration) using PWM to control the brightness - https://datasheets.maximintegrated.com/en/ds/MAX16834EVKIT.pdf
The MAX16384 can be supplied with 7 - 28V.
Since the forward voltage of a LED is say 2.8V then my 8 cluster would require 22.4V, however, my 4 cluster would require 11.2V.
I assume that each MAX16384 could not be powered from a common supply rail, but each MAX16384 would need a specific supply rail/voltage to match the forward voltage drop of the LED cluster it is driving? I wasn't sure whether this needs to be the case or the fact that the driver is constant current might allow all cluster drivers to be supplied with a common voltage (the highest)
If all cluster drivers do need a specific custom rail is there a neat/common way of doing this?