sjim:
With the ZXLD1360, can I directly connect pwm output from an 3ch RGB controller to the 1360? They're not logiclevel (I think).
http://www.diodes.com/datasheets/ZXLD1360.pdf
Yes, you can run the Open Collector PWM signals from your controller to the "ADJ" pin of the ZXLD1360.
sjim:
If I limit current to 300ma per color, could I then take the Blue from 3 of the RGB's connect to single 1360, do the same for RED, Green...thus needing only 6x1360s for a fixture with 6x3wRGB? Aka, run colors in series to each 1360 chip separately.
Because you have Common Anode RGB devices you can't put them in series. That means you need one ZXLD1360 and all its associated components for EACH color of EACH LED package. If you buy separate R, G, and B LEDs you can put several in series and run the series off a single ZXLD1360.