How`s the UCC28950 current share by casecade as attachements ?

If you have two UCC28950 power converters operating in parallel using peak current mode control with one feedback loop they should share current fairly well.  The configuration you sent looks correct.

This works because one comp voltage controls the peak current level of both power stages.  The level of the comp of the master controls both peak current limits of the slave as well.  That is why the slave is setup in a voltage follower.

Regards,