Hello,
I have a question concerning a led driver design for an art project. I need to drive several (76) led stripes. It is planned to switch the stripes one after another in about 20 sec. The stripes are ready-made bought from a supplier. Each stripe has an individual length and consists of several led-modules, these are connected in parallel, and each module itself consists of three 3-chip leds in series with additional resistors in each lane to reach the 12V form an 12Vdc voltage source.
For a short cable length this means no problems. But in my case the cable length is varying between 5 and 23 meters whit a large voltage drop over the distances. You can calculate the voltage drop in order to compensate it for each cable but the exact cable lengths are unknown and as of the large number of stripes it is not possible to calibrate the voltage for each cable length. But what I can calculate easily is the required current for each stripe.
So I thought of something like the tps61500 and the tps40211 to set the current for each stripe via R_sense and then the driver gives the required voltage. So I have currents ranging from 360 mA for the smallest to 6A for the largest stripe. As the tps61500 needs fewer parts I want to use this driver for currents <=2A. Above this limit I thought of the tps40211 as its current limit ends at 6A. My voltage source gives 12V and 10A. With the Enable Pins of the two ICs I want to switch and maybe dimm each driver module separately.
Are these considerations correct? Or are there better alternatives for my purposes?
Thanks & Best Regards,
Alex
