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BQ76PL455A: the VIO supply by Vtop or outside power

Part Number: BQ76PL455A

   i found  the BQ76PL455A demo : VIO  is supplied by outside power  when work in SINGLE ENDED mode。but  ,when  work in  DIFFERENTIAL mode ,the VIO is supplied by VTOP through NPN transistor。i want to know why,can i use VTOP when work in  SINGLE ENDED mode。