I know I'm not the first one asking this around here, but in 2 weeks of scouring the internet I have still not found a satisfactory solution to control my DealExtreme common-anode RGB LED's (star shaped).
The regular solution of throwing some power resistors at the problem is something I wish to avoid. The current these things draw will cause a lot of unnecessary power usage and heat development.
What then opens itself up is a wide world of constant current style controllers, but I can no longer see the trees through the forest.
My wishes are simple: -I need to sink(!) about 250 mA per colour (common anode design). -I want to be able to PWM all channels, otherwise whats the point of RGB. -I would like to keep component count as low as possible. -Preferably no linear solutions due to heat development, but I can live with this if need be.
Is there anything that fits the bill without braking the bank? (Yes I have seen those 20$ buckpuck IC's, but I'd need 3 per LED, not an option).
I would really value any opinion. Thanks in advance.