STEVAL-ESC001V1 circuit schematic question

[GhostSherry]

Hey Community!

Newbie here + first post

In the STEVAL-ESC001v1 can someone please explain what this portion of the schematic means/is doing (document attached)?

Also how do you determine the max current draw of your Hbridges? Most I have seen just define a current, but don't actually explain how they arrive that those currents

Thanks so much in advance!