SI9987CY-E3

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Introduction to SI9987CY-E3

SI9987CY-E3 belongs to the category of Motor Drivers, Controllers and PMIC (Power Management Integrated Circuits). Developed by Siliconix Inc., its main function is to control up to three phases of brushless DC motors with advanced control algorithms. It provides direct current sensing and current rate limiting to ensure optimal performance and safety of the motor.

Application Field of SI9987CY-E3

SI9987CY-E3 has wide range of applications. It can be used in power tools, airline ground support equipment, soft-start applications, robotics and Automation, gasoline and other combustion-engine applications.

It is a well-suited option for applications where low heat dissipation, low noise, high efficiency and precise control are required. It is often used in automotive applications such as engine control modules, transmission systems, and in medical devices.

Working Principle of SI9987CY-E3

The SI9987CY-E3 can be used to power and control up to three DC brushless motors with an integrated PWM voltage regulator. The SI9987CY-E3 can be used to power both 3- and 4-phase motors, and includes sine-cosine diode emulation for low torque ripple and low audible noise. The chip can also act as a current-mode gate driver, providing higher efficiency and smaller current forced (low Rds(on)).

SI9987CY-E3 is equipped with advanced protection features such as under-voltage lockout protection, over-voltage protection, overcurrent protection and short-circuit protection. The SI9987CY-E3 has a built-in thermal protection feature which helps in protecting the chip from burning out in case of excessive current or high temperatures.

Once this feature is activated, the chip automatically reduces the motor current to an appropriate level and helps it to sustain a longer runtime even in the case of high temperatures. Its advanced motor drive algorithms help in providing higher torque performance and smooth operation.

In addition, the SI9987CY-E3 is also equipped with a wide range of other features such as a built-in crystal oscillator and pulse-width modulation control logic, which helps the chip to precisely control the motor speed and torque.

It also has a low-power sleep mode which reduces the power consumption when the motor is not in use. Lastly, the SI9987CY-E3 includes short-to-ground protection, pre-bias start up, a reset input to clear faults, and programmable over-temperature warning levels.

Conclusion

SI9987CY-E3 offers a wide range of features for efficient control and protection of brushless DC motors. It provides precise speed, torque and current control and protection features such as short-circuit protection and over-temperature warning. It is suitable for applications such as automotive and medical devices, power tools and other applications where precision and safety are critical.

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