Other Parts Discussed in Thread: LM5045
Tool/software:
We use two UCC21225 chips to drive 4 synch rectifier MOSFETs in a full bridge config., using a transformer single winding output (no center tap). One LM5045 controls two UCC21225 chips in this config. See schematic below which shows our output bridge rectifier cct. When the transformer dot end goes +ve, FETs A & B should be driven on and C & D off ; and vice versa when when the dot end goes -ve. The two UCC21225's drive gates A, B, C, & D.
However in our board the MOSFET gate connections to the UCC21225's have been accidentally reversed, which means the transformer is connected in reverse polarity wrt the MOSFETs; i.e., when the dot end goes +ve, FET's C & D are on, and A & B off, and vice versa when the dot end is -ve.
We cannot easily swap the transformer-MOSFET connections; the easier method is to swap the MOSFET gate-UCC21225 connections (A/B - C/D) ; or we can swap the LM5045 SR1 -SR2 connections.
Are both or either of these fixes acceptable? The benefit of swapping SR1 /SR2 pins is that the gate drive - UCCC21225 connections remain optimal wrt PCB layout.
