The individual star 3w RGB leds have come down in price quite a bit so I purchases a bunch, specs are (R=2.5, B=3.5, G=3.5) 350ma per channel. I'd like to make several wash fixtures each with 6 of these RGBs and single DMX addr per fixture. I was planning on using one of these DMX512 Decoder Drive Controller PX24506 3A 3CH 256 Level Brightness Full Color L | eBay for the 1st fixture in the daisy chain bc it outputs DMX, then use these cheaper DMX controllers on the 2nd,3rd fixtures 3 Channel RGB DMX Controller - 12v DC / 6 amps w/Bare Lead Input & Output these only listen for DMX input and don't relay it, hence the need for 1st listed controller above.
Most of these DMX controllers (assuming) output PWM, vs SPI..etc ? In order to build the fixtures I need build drivers inputting/understanding PWM. Per fixture is 6 RGB, = 18 leds, are they any IC's chips (TLC2950 24ch but inputs only 1 pwm ch per chip I believe), there's the CAT4109 with 3 pwm inputs and 3 led outputs though output per ch is 175ma and I need 350ma..could amplify to achieve 350ma I think. (The IC would need direct pwm inputs). My questions are I'd like to use 3 ICs (1 per color) for a single fixture, versus, 18 ICs (3 per RGB) to simplify the design. In using only 3ICs per fixture the IC would need rating of 2amp (6*350ma), The voltage coming out of the DMX controllers will need to be regulated via constant current circuit, any advice on such a build?
Thanks
Jim
Most of these DMX controllers (assuming) output PWM, vs SPI..etc ? In order to build the fixtures I need build drivers inputting/understanding PWM. Per fixture is 6 RGB, = 18 leds, are they any IC's chips (TLC2950 24ch but inputs only 1 pwm ch per chip I believe), there's the CAT4109 with 3 pwm inputs and 3 led outputs though output per ch is 175ma and I need 350ma..could amplify to achieve 350ma I think. (The IC would need direct pwm inputs). My questions are I'd like to use 3 ICs (1 per color) for a single fixture, versus, 18 ICs (3 per RGB) to simplify the design. In using only 3ICs per fixture the IC would need rating of 2amp (6*350ma), The voltage coming out of the DMX controllers will need to be regulated via constant current circuit, any advice on such a build?
Thanks
Jim
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