The UCC3895 device should be operated from a V_DD rail within the limits given in the Recommended Operating Conditions of this data sheet. To avoid the possibility that the device might stop switching, V_DD must not be allowed to fall into the UVLO(off) range. In order to minimize power dissipation in the device, V_DD should not be unnecessarily high. Keeping V_DD at 12 V is a good compromise between these competing constraints. The gate drive outputs from the UCC3895 device deliver large-current pulses into their loads. This indicates the need for a low-ESR decoupling capacitor to be connected as directly as possible between the V_DD and PGND terminals.

TI recommends ceramic capacitors with stable dielectric characteristics over temperature, such as X7R. Avoid capacitors which have a large drop in capacitance with applied DC voltage bias. For example, use a part that has a low-voltage co-efficient of capacitance. The recommended decoupling capacitance is 1 μF, X7R, with at least a 25-V rating with a 0.1-µF NPO capacitor in parallel.