Well you could have typed in pca9685 on google
And I would have, if I were the one needing help.
Adafruit 16-Channel 12-bit PWM/Servo Driver - I2C interface - PCA9685
What are you going to do with THAT? I thought I read that you were trying to control LED strips.
Which LED strips? The ones I have connect to a single pin on the Arduino (well, that pin and ground), and I can control any of the LEDs without needing a 16 channel 12 bit PWM/Servo driver with an I2C interface.
I got mine from Adafruit.