I am using UCC21222-Q1 in a high power synchronous buck converter for an automotive application. OUTA is connected to the gate on the high side MOSFET and powered by an isolated power supply. OUTB is connected to the gate of the synchronous MOSFET and powered by a non-isloated 12 V supply. When the converter operates at high power levels OUTB experiences negative to ground voltage transients after the synchronous MOSFET gate is pulled low. The transients normally peak at around -4 to -5 V and decays to 0 V over a period of around 100 ns. When the buck converter is operated at its maximum design power, the transients peak around -7 V and OUTB can experience a permanent short to VSSB event.The converter layout has been optimized to minimize parasitic inductance between gate driver and switched MOSFETs. Are there any other steps I can take to prevent UCC21222-Q1 outputs from being damaged by negative voltage transients?
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