The recommended bias supply voltage range for UCCx732x is from 4.5 V to 15 V. The upper end of this range is driven by the 16 V absolute maximum voltage rating of the VDD. TI recommends keeping proper margin to allow for transient voltage spikes.
A local bypass capacitor must be placed between the VDD and GND pins. And this capacitor must be placed as close to the device as possible. A low ESR, ceramic surface mount capacitor is recommended. TI recommends using 2 capacitors across VDD and GND: a 100-nF ceramic surface-mount capacitor for high frequency filtering placed very close to VDD and GND pin, and another surface-mount capacitor, 220 nF to
10 µF, for IC bias requirements.