LS7263 Application Circuit Example

Four application examples are presented in the figure, focusing on a three-phase brushless DC motor used in Winchester disk drives with an operating speed of 3600 RPM. Although the original design specifies an operating speed of 3600 RPM, alternative speeds can also be utilized. For instance, by employing the LS7263-02 circuit along with a 2.68 MHz crystal oscillator and incorporating a tachometer signal for division, an accurate speed of 5400 RPM can be achieved. Furthermore, if a variable frequency oscillator replaces the LS7263, the motor can function at speeds of 1500 RPM or lower.

The described system revolves around a three-phase brushless DC motor, which is integral to the operation of Winchester disk drives. This type of motor is favored for its efficiency and reliability in high-speed applications. The standard operating speed of 3600 RPM can be adjusted based on specific requirements, demonstrating the adaptability of the motor design.

The LS7263-02 circuit plays a pivotal role in speed control. It utilizes a 2.68 MHz crystal oscillator that provides a stable frequency reference for the motor control system. By integrating a tachometer signal, the circuit can accurately measure the motor's rotational speed and enable precise speed adjustments. This feedback mechanism is essential for maintaining the desired performance and ensuring the motor operates within specified parameters.

For applications requiring higher speeds, the configuration allows for an increase to 5400 RPM, showcasing the versatility of the motor control system. Conversely, when a variable frequency oscillator is implemented, the system can be tuned to lower speeds, such as 1500 RPM or even less. This flexibility makes the motor suitable for a wide range of applications, from high-speed data retrieval in disk drives to low-speed operations in other electronic devices.

In summary, the three-phase brushless DC motor employed in Winchester disk drives is characterized by its adjustable speed capabilities, facilitated by the LS7263-02 circuit and crystal oscillator. The potential for both high and low-speed operations enhances its applicability in various electronic systems.4 Application examples of applications are given in the figure, it is a Winchester disk drives three-phase brushless DC motor, the operating speed is 3600r/min. Although the or iginal design of the circuit operating speed is 3600r/min, but other speed may also be used. For example, the use of LS7263-02 circuit, with the government 2.68MHz crystal oscillator oscillator, plus a tachometer signal to divide the circuit, you can get an accurate 5400R/mn. If the crystal oscillator circuit with a variable frequency oscillator instead of t LS7263 also allows the motor to work in 1500r/min or less speed.