JAJSU38 April 2024 DRV8215
PRODUCTION DATA
The DRV8215 provides the ability to regulate the voltage applied to the motor winding or to regulate the speed of the motor. This feature allows constant motor speed to be maintained even when operating from a varying supply voltage such as a discharging battery. The DRV8215 uses a pulse-width modulation (PWM) technique instead of a linear circuit to minimize current consumption and maximize battery life.
The intended voltage or speed can be programmed by the WSET_VSET bits. Refer to Section 7.3.6.2.1 for further explanation.
Four ranges of motor speed can be selected using the W_SCALE bits to support low, moderate and high speed applications. The speed regulation loop compares the motor speed estimated by the speed estimator with the user definded target speed. The following section describes the internal bridge control logic taking voltage regulation as an example, but is also applicable for speed regulation.
Figure 7-12 shows the closed loop PI control for regulating speed and voltage.