SLVSAM9D April 2011 – December 2015 DRV8802
The DRV8802 is designed to operate from an input voltage supply (VMx) range between 8.2 V and 45 V. Two
0.1-µF ceramic capacitors rated for VMx must be placed as close as possible to the VMA and VMB pins respectively (one on each pin). In addition to the local decoupling capacitors, additional bulk capacitors is required and must be sized accordingly to the application requirements.
Bulk capacitance sizing is an important factor in motor drive system design. It is dependent on a variety of factors including:
The inductance between the power supply and motor drive system limits the rate current can change 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. You must size the bulk capacitance to meet acceptable voltage ripple levels.
The data sheet generally provides a recommended value but system level testing is required to determine the appropriate sized bulk capacitor.
There is no specific sequence for powering-up the DRV8802. It is okay for digital input signals to be present before VMx is applied. After VMx is applied to the DRV8802, it begins operation based on the status of the control pins.