SNOSCY4E March 2015 – October 2018 LMG5200
The VCC bypass capacitor provides the gate charge for the low-side and high-side transistors and to absorb the reverse recovery charge of the bootstrap diode. The required bypass capacitance can be calculated with Equation 1.
QgH and QgL are the gate charge of the high-side and low-side transistors, respectively. Qrr is the reverse recovery charge of the bootstrap diode. ΔV is the maximum allowable voltage drop across the bypass capacitor. A 0.1-µF or larger value, good-quality, ceramic capacitor is recommended. Place the bypass capacitor as close as possible to the VCC and AGND pins of the device to minimize the parasitic inductance.