I think I'm right but I want a confirmation.
With linear led drivers, they usually have a maximum input voltage for their internal circuitry but they basically limit the current going through the string of leds by measuring the voltage drop across a sense resistor, right? So the number of leds in the string and the voltage at the first led shouldn't matter, because the led driver is on the low side just measuring a drop of under 1v on the sense resistor and maybe dropping a few volts behaving like a linear regulator
I'm looking in particular at a driver like AL1793AFE :
https://www.diodes.com/assets/Datasheets/AL1791_1792_1793_1794.pdfIt has 3 channels, all are set to a maximum current with a resistor, and the driver IC can be powered with ~ 6.7v to 30v, but it looks to me like that's independent of the voltage used on led strings.
So I should be able to power this driver chip with 9v or 12v (as it's above 6.7v and below 30v), but can I have 48v powering 14 x 3.4v leds = 47.6v leds on one channel?
The driver's channel should drop only ~0.4v - 0.1v dropped on the resistor.