SN3218 to drive a rgb led strip


#1

I’m a very beginner in electronic.
I’d like to use the sn3218 to drive a rgb led strip. For example conecting the SN3218 outputs to a ULN2003A Darlington to drive the current required by the led strip.
Any suggestion?
TIA
Massimo


#2

How long is the strip, what sort of LEDs? What’s the pinout of the strip? Is it individual R/G/B channels with a common connection- is it a common power or ground connection?

The ULN2003A is inverting by nature, and the SN3218 is a sinking, constant current driver. I’d say they would make a poor combination but I understand from your example what you’re trying to accomplish.

If your LEDs were common ground/cathode, it would probably be easier to ditch the SN3218 and use just the ULN2003A, in combination with software PWM on the Pi. Or possibly even something like Pi Blaster- https://github.com/sarfata/pi-blaster


#3

I’d like to drive 4 different strips, 1 meter each. They are with a common 12vcc and 3 pins for red, green and blue. So I need 4x3 12 pwm signal to drive them.
My idea was to use 12 ports on the SN3218 to drive 12 ports on the ULN2003A.
Regards
Massimo