Can i just attach 3 separate PWM channels to control each colour?
There are a few ways to do this, and your actual intended application can change what you do.I drive those exact LEDs with the CAT4109 driver from ON Semi. The catch? They're in a SOIC-16 package, so unless you are up for surface mount soldering, you're not going to be happy. It also only drives them at 175mA - that's fine by me, as they're still VERY bright, but you can parallel the outputs to get 350mA.How about a few TLC5940s with paralleled outputs? (sinks, really): http://focus.ti.com/lit/an/slva253/slva253.pdfJust want to use parts available at your local radio shack? It gets much tougher, as we're dealing with a common anode led with some pretty serious current requirements. If you have an application in mind, do share and it will help.