SLUS829G August 2008 – February 2020 UCC2897A
This pin provides a reference potential for all small-signal control and programming circuitry inside the UCC2897A. Ground layout is critical for correct operation. High-current surges from the MOSFET drivers conduct through PVDD, OUT, AUX, and PGND. To localize these surges, PVDD must bypass directly to PGND. PGND current must be electrically, capacitively, and inductively isolated from GND with only one short trace connecting PGND to GND, located to best minimize noise into GND.