Hi Frank,
Thank You for advices. I've played with couple of different capacitance on the input and output and the conclusion is that, it looks better when the output capacitance is about 100 - 220uF.
Ceramic capacitor on the input is making more noise.
I'am able to make a "quite" output on one IC, when I connect a polygon on the bottom side of the pcb only in one point ("-" of output C). But when I connect second IC then on one of the IC output, noise appear again.
Finally I was able to make a noise free output on both IC but only in one output voltage and current set. If the load current have changed or voltage, then noise is comming back and also sometimes 50Hz noise from the supply net appear.
It generally looks like something is not stable. How I can get stable state if the current load will be changing (0,5 - 2A) an I need to have an output voltage setable (16-22V)???
Or maybe I should looks for another IC?
Pawel