SLUSA16D March 2010 – November 2016 UCC28950
PRODUCTION DATA.
The UCC28950 device should be operated from a VDD rail within the limits given in the Recommended Operating Conditions section of this datasheet. To avoid the possibility that the device might stop switching, VDD must not be allowed to fall into the UVLO_FTH range. In order to minimize power dissipation in the device, VDD should not be unnecessarily high. Keeping VDD at 12 V is a good compromise between these competing constraints. The gate drive outputs from the UCC28950 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 VDD and GND 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.