@septillion, I'm driving 3w leds (700mA) at +-12V, so the PCA9685 cannot handle even a single led 
The feedback isn't added since this is for constant voltage, and over voltage protection. This isn't possible in my case as not all LEDs I use are at the same voltage. So a fixed over voltage protection will ether still fry the lowest voltage LEDS or limit the highest voltage LEDS. (I reverse engineered an Ebay driver where this was also removed). The typical application would indeed include the feedback:
@ReverseEMF, Thanks for explaining how I can read the datasheets better in the future.
I just read the How to briefly as I'm still at work. I'll read it fully later to day. I understand that and error can be in the smalles detail. I'll create my future posts with that in mind and post every detail needed to resolve an issue! Thanks!