DRV8860EVM

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Evaluation and Demonstration Boards and Kits provide an efficient tool for testing, evaluation, and prototyping with electronics components. The DRV8860EVM is one such board used for smart control of low voltage DC motors. The board is compatible with a variety of low-voltage brushed DC motors, servo motors, and stepper motors in a wide range of applications.

The DRV8860EVM is based on the DRV8860 H-bridge motor driver IC and offers various features such as adjustable current limits, sleep mode, and acceleration control to minimize motor stress during operation. It is designed to control bidirectional, low-voltage, brushed, DC motors with two banks of four-phase outputs, typically used in cordless vacuums and digital cameras. The board’s built-in sequencer can be configured to control step size, ramp amplitude, and pulse duration for a variety of applications.

The DRV8860EVM board is capable of delivering up to 8.5W to the motor, while consuming less than 400mW of quiescent power in stand-by mode. It can supply motor supply voltages up to 10V and is capable of sustaining short current peaks up to 4A without impacting the board’s overall power consumption.

The board’s working principle is based on the two banks of H-bridge outputs that generate output signals using four internal components, namely the PWM generator, the control logic, the driver, and the fault protection circuit.

The PWM generator is responsible for controlling the outputs of the H-Bridge. It produces a pulse-width-modulated (PWM) signal that controls the output of the H-Bridge by changing its duty cycle. The duty cycle determines the amount of current and torque applied to the motor.

The control logic on the DRV8860EVM board provides an interface between the user and the PWM generator. It can be configured to control the step size, ramp amplitude, and pulse duration of the board, as well as offers built-in safety features to protect the board in case of fault. It receives the user inputs via a standard SPI or I2C interface, and based on the inputs, it determines the desired outputs for the PWM generator.

Finally, the driver circuit is designed to receive the PWM signal from the PWM generator and provide the necessary current and torque to the motor. It also provides protection to the board in case of fault, by turning off the outputs if the current level exceeds the specified limit or the motor is stalled.

The DRV8860EVM board can be used in a variety of applications,such as motor control in robotic vacuums, digital cameras, and other consumer electronics. Thanks to its integrated sequencer and adjustable current and PWM settings, the board is easy to configure and use, making it an ideal choice for motor control applications.

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