I want to make a PWM controlled LED light for my room. To light up the room, I'm hoping to get 1,000 - 1,500 lumens out of it. For maximum coolness, I want to have at least four channels so I can have RGB + warm white. I've been googling about powering such a device all day and found many solutions, none of which looked particularly easy besides this shield
. Being an electronics newbie, I don't quite understand exactly what the parameters my DC adapter would need for this. If I want 4 channels operating at 700 mA with 30V, then obviously it needs to supply at least 4 * 0.7 * 30 = 84 Watts.
But what exactly determines the output voltage of a current regulator? Is it just the same as the voltage of Vin? I am very confused on these points.
That shield also seems a little pricey considering single-channel 1-Watt led drivers with PWM like the CAT4101
are less than a dollar. Is there a way to power an arbitrary number of these from one DC adapter? If the DC adapter regulates the voltage to 30V or whatever and I wire up n (an arbitrary number) CAT4101's in parallel to it (and the adapter can supply up to n amps or more), then I could safely power n independent LED strings with the proper voltage and current, right?
Thank you for any help! This stuff is all so confusing to me.