SLVSDA7E February 2017 – August 2019 TPS61178
The primary purpose of the VCC capacitor is to supply the peak transient currents of the driver and bootstrap capacitor as well as provide stability for the VCC regulator. The value of CVCC should be at least 10 times greater than the value of CBST, and should be a good quality, low ESR, ceramic capacitor. CVCC should be placed close to the pins of the IC to minimize potentially damaging voltage transients caused by the trace inductance. A value of 4.7 µF was selected for this design example.