UCC25630 OVP BW PIN ISSUE

         I have four questions on ucc25630 as follows:

1. When the FB pin pull Low, will shut dow, when the Low situation is released, the reply time for how long(?us)?
2.  BW pin When OVP fault, the protection action is Latch or Autorecover?
3.  Whether the BW pin can directly fill 4 Vdc
4. If UCC25630 with UCC28063, UCC28063 how to accept the Vcc more appropriate?