You can find the schematic here (link GitHub). I designed a small breakout board in Eagle. The figure below shows the current paths in different drive and decay modes. In fast decay mode, the H-bridge is disabled and recirculation current flows through the body diodes in slow decay, the motor winding is shorted. To PWM using fast decay, the PWM signal is applied to one xIN pin while the other is held low to use slow decay, one xIN pin is held high. To handle this recirculation current, the H-bridge can operate in two different states, fast decay or slow decay. When controlling a winding with PWM, when the drive current is interrupted, the inductive nature of the motor requires that the current must continue to flow. This is called recirculation current. The inputs can also be used for PWM control of the motor speed. The xIN1 and xIN2 input pins control the state of the xOUT1 and xOUT2 outputs. It has two H-bridge drivers, and can drive two DC brush motors or a bipolar stepper motor. The DRV8833 is a dual bridge motor driver for low-voltage applications.
0 Comments
Leave a Reply. |