Hi,
This is Ben. I want to discuss some function block about LM25575 with you.
1. When I connect two LM25575 by SYNC pin. Can they become a muti-phase power source?
2. In my opinion, because of OP –Vsupply is connect to SW pin and the gate signal which generate by flip-flop should match OP Vin range. So the level shift is required.
Bootstrap Cap(C7) is needed to boost gate drive voltage above VIN to keep it on next time. Is it right? Does other power ICs need this level shift function?