BD7789RFS-E2

PMIC - Motor Drivers, Controllers

The BD7789RFS-E2 is a highly efficient, three-phase brushless DC motor driver from ROHM Semiconductor. It features a Field-Oriented Control (FOC) algorithm that enables smooth and precise control of an AC motor, making it an ideal solution for industrial applications such as air conditioner, washing machine, fan, water pump, and other blower motors. The device is also capable of being configured to run in sinusoidal control or trapezoidal control modes, depending on the requirement of the application. With its high-precision, low-power operational performance, the BD7789RFS-E2 can maximize the efficiency of blower motors with minimal power dissipation.

Application Field

The BD7789RFS-E2 is primarily designed for use in industrial motors such as air conditioners, washing machines, fans, water pumps, and other blower motors. The device’s open-loop vector control (FOC) algorithm provides superior motor performance, improving output current characteristics and acceleration. Additionally, the device offers advanced smooth start/stop operation and supports both sinusoidal control mode and trapezoidal control mode, making it an ideal solution for high-precision, low-power motor control applications.

Working Principle

The BD7789RFS-E2 uses field-oriented control (FOC) to ensure precise, efficient, and smooth control of an AC motor. The FOC used by the BD7789RFS-E2 is based on the vector control method, which uses a rotating coordinate system for controlling the AC motor’s speed and torque. A two-axis system is used to control the AC motor’s rotation direction, speed, and torque. The first axis is the torque axis, which is aligned to the motor’s stator flux vector. The second axis is the flux vector, which is aligned to the motor’s rotor flux vector. By adjusting both the direction and magnitude of the stator flux vector, it is possible to control the torque and speed of the AC motor. Additionally, the BD7789RFS-E2 supports configurable operation modes (sinusoidal or trapezoidal) and advanced smooth start/stop operations.