The VDD bias voltage to the UCC29002 device is limited to a maximum of 13.5V when powered from a low-impedance source. An internal clamp-circuit (nominally 14.25V) allows the use of higher bias-supply source voltages provided that a suitable resistance is connected between the high-voltage source and the VDD pin to limit the total VDD current to below its absolute maximum rating.

When used with a series resistor to limit I_VDD, the VDD pin must be decoupled directly to the GND pin with a good-quality ceramic capacitor. The device is optimized for a capacitor value from 0.1µF to 1µF. Values outside of this range may result in unstable clamping voltage.