DRV8821DCAR

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PMIC - Motor Drivers, Controllers are essential components in modern electric systems such as robots, vehicles, electric pumps, etc. DRV8821DCAR is one of the popular motor drivers in the field. This article introduces the application fields, working principles, and key performance indicators of this chip.

Application Field

DRV8821DCAR is widely used in electronic systems that require brushless DC (BLDC) motor drives. It is widely used in automotive, robotic, industrial control, energy storage, medical instruments, industrial automation and other applications that require motor operation. It can provide fast current rise and fall, high speed operation and high torque control. It has a wide voltage range (3V to 24V) and can be used for 3-phase brushless DC motors between 6V and 20A.

Working Principle

DRV8821DCAR is a three-phase brushless DC motor driver. It can drive up to 3-phase brushless DC motors with a power supply in the Clasd range of 3V to 24V and a current rating up to 20A. It is capable of shutting down or restarting the motor quickly and efficiently to help reduce power consumption and improve efficiency. It also supports the control of the motor current using the I2C digital interface. With a high-resolution current setting and current monitor capability, DRV8821DCAR is able to accurately control the motor current.

DRV8821DCAR also supports a variety of operating modes, such as speed mode, torque mode, torque/speed mode and peak current mode. In speed mode, the motor speed is controlled by varying the voltage applied to the phases, while in torque mode the motor is driven with a certain voltage and the current is adjusted to generate the torque. In torque/speed mode, the motor is driven with a torque profile and a speed profile to achieve precision control. And in peak current mode, the motor current is limited to a peak value to protect the motor from overload.

Key Performance Indicators

DRV8821DCAR features various key performance indicators that set it apart from the competition. It has a wide operating voltage range of 3V to 24V, making it suitable for a variety of applications. In addition, its maximum output current is up to 20A, allowing it to control powerful motors. It also has a built-in VTH pin to sense the voltage of the motor phases and its current sensing function can be accurate up to 0.1A. Furthermore, it comes with on-board protection features such as thermal shutdown and over-current protection.

DRV8821DCAR also features advanced digital control features including I2C serial digital interface control and a precise current setting and monitoring capability. It also has an adjustable standby current settings, a programmable PWM frequency, and a pulse wide modulation (PWM) control mode. All of these features provide precise control of the motor current, allowing the user to accurately control the motor.

In summary, DRV8821DCAR is a popular motor driver that is suitable for high performance motor control. It has a wide voltage range, a high output current capability, accurate current control and advanced digital control features, making it perfect for a variety of applications. It is an essential part of any system using brushless DC motors for precise control.

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