SLVSB17D March 2012 – April 2016 DRV8836
PRODUCTION DATA.
The appropriate local bulk capacitance is an important factor in motor drive system design. More bulk capacitance is generally beneficial but may increase costs and physical size.
The amount of local capacitance needed depends on a variety of factors, including:
The inductance between the power supply and motor drive system limits the rate current changes from the power supply. If the local bulk capacitance is too small, the system responds to excessive current demands or dumps from the motor with a change in voltage. When adequate bulk capacitance is used, the motor voltage remains stable and high current can be quickly supplied.
The datasheet provides a recommended value, but system-level testing is required to determine the appropriate sized bulk capacitor.