The UCC28070A must be operated from a V_CC rail which is within the limits given in Recommended Operating Conditions. To avoid the possibility that the device might stop switching, V_CC must not be allowed to fall into the UVLO range. Yet, to minimize power dissipation in the device, V_CC must not be unnecessarily high. Keeping V_CC at or near 12V is a good compromise between these competing constraints.

The gate drive outputs from the UCC28070A can 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 VCC and GND pins. TI recommends ceramic capacitors with a stable dielectric characteristic over temperature, such as X7R. Avoid capacitors which have a large drop in capacitance with applied DC voltage bias and use a part that has a low voltage co-efficient of capacitance. TI recommends a decoupling capacitance of 10μF, X7R, with at least a 25V rating. A capacitor of at least 0.1μF must be placed as close as possible between the VCC and GND pins.