Home-made 10W RGB LED driver?

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hi,

i want control 10 pcs. of 10w rgb leds @ 12v,  including being able change color of each led seperately, preferably @ high speed.

i'm thinking can control them on i2c bus several pca9685, each giving me 16 pwm outputs.
but cannot draw current chip, else can do?
essentially want amplify 5v pwm output. since each channel r,g,b might have different maximum voltages, i'm planning provide constant 12v, 11v , 8v vdc power source.
so, perhaps 5v pwm output serve signal high-speed transistor, resulting in respectively 12v, 11v or 8v in pwm form?

is design? there better way?

if supply constant current not need specify voltage, taken cair of automatically.
therefore don't need amplify pwm voltage, use pwm turn on or off constant current drive.

this typical constant current drive, parts shown not drive 10w.


Arduino Forum > Using Arduino > LEDs and Multiplexing > Home-made 10W RGB LED driver?


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