The DRV10974 device is a three-phase sensorless motor driver with integrated power
MOSFETs, which can provide continuous drive current up to 1 A (rms). The device is designed for
cost-sensitive, low-noise, and low-external-component-count applications.
The DRV10974 device uses a proprietary sensorless-control scheme to provide dependable
commutation. The 180° sinusoidal commutation significantly reduces pure tone acoustics that are
typical with 120° (trapezoidal) commutation. The DRV10974 spin-up is configured using a single
external low-power resistor. The current limit can be set by an external low-power resistor.
The DRV10974 device provides for simple control of motor speed by applying a PWM input to
control the magnitude of the drive voltage or by holding PWM high, varying the supply voltage, and
monitoring the FG pin for speed feedback.
The DRV10974 device includes a number of features to improve efficiency. The
resistor-configurable lead angle allows the user to optimize the driver efficiency by aligning the
phase current and the phase BEMF. In addition, the use of low-rDS(on)
MOSFETs helps to conserve power while the motor is being driven.
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