i’m trying to drive 5rgb leds, all with 3(each color) differnt pwm signal, so at all, 15pwm signal.
the point is:
Blue and green component have voltage drop of 3.95, and redish one have 2.95 (all deaw 350mA).
the first solution that comes in my mind was to use a VCC + CURRENT LIMITER RESISTOR + LED.
So i must go down to the nearest value of voltage to feed the led.
4.5 is a good value, since is a common transformer value, it’s not far from both the voltage drop, (and i waste a maximum of 500mW over the red-linked resistence).
unfortunatly i must consider a huge amount of current (each color draw 350mA, so each RGB led draw 1050, that mean 5A in the worst case of all light in white)
unfortunatly it’s hard to find over 2A AC to DC (4,5v) transformer.
So here i’am… probably i used the wrong idea at the begin when i try to use a common resistence-limiter method, when something more efficient is possible out there