Hi,
I have some trouble getting the LM3405A to work properly - I'm using the circuit and recommended parts from page 18 on the data sheet. Vin=5V driving a single LED @ 1A I do not get 1A current instead I get
R: 0.61A
G: 0.32A
B: 0.4A
W: 0.38A
The output current is dependent on the forward voltage of the LED and not even close to 1A. I tried changing various components e.g. L1 to 6.8uH, D2 to BAT54, I also verified that R1 is indeed 0.2R. Increasing Vin to about 6.6V brings the current up to the correct range. I'm attaching the PCB I'm using - any feedback is greatly appreciated.