DRV8881PRHRR

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DRV8881PRHRR is an integrated motor driver system designed for driving 3-phase brushless DC motor applications. It offers closed-loop current control and an operating temperature range of -40 °C to +125 °C.

The DRV8881PRHRR IC combines a 3-channel oscillator, a 4th order low-pass filter and an autoprotection device with a 3-channel internal full-bridge analog PWM driver and a watchdog timer. This allows efficient control of the current in the motor coils, over-temperature protection and complete protection from accidental miswiring of the motor coils. Additionally, the IC features an integrated charge pump for underspeed detection, optional integration of an error amplifier, and an easy-to-use logic interface.

The DRV8881PRHRR is suitable for controlling a wide range of brushless DC motors in applications such as pump control, solar array tracking, and robotic traction control. It can also be used to control single- or multiple-axis motion systems and be used in applications such as rotary vane applications, motion controller systems, and servo motors.

In terms of the working principle, the DRV8881PRHRR IC is capable of accurately controlling the current flow into the motor coils while preventing noise interference. This is achieved by continuously measuring the current through the motor coils, along with a 4th order low-pass filter to reduce noise. The low-pass filter provides the ability to directly control the current in the motor coils without being affected by the desired motor signals.

Additionally, the DRV8881PRHRR IC features a 3-channel oscillator for generating the motor reference signal. The reference signal is used to modulate the controlling PWM signal in the motor coil. This guarantees a high degree of accuracy in motor control, as well as stability, even at high speeds.

The DRV8881PRHRR features an integrated charge pump. This allows the IC to detect an underspeed condition, ensuring an accurate control of the motor speed at all times. The IC also includes an error amplifier, which can be used to control the speed of the motor in an open-loop mode.

Lastly, the IC also includes a watchdog timer, which provides protection against miswiring or accidental disconnection of the motor coils. It ensures the accurate operation of the motors in the presence of short circuits, or other misconnections.

In conclusion, the DRV8881PRHRR IC is a highly capable motor driver solution for controlling brushless DC motors and robotic traction control applications. It features a wide operating temperature range and closed-loop current control. Additionally, it offers protection from miswiring, as well as an integrated charge pump and error amplifier for open-loop control.

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