Introduction
    The global high-speed brushless motor industry is experiencing continuous growth and development. According to market research, the Asian market holds the top position in the global high-speed brushless motor industry, with a market share of 47%, and it is expected that future growth will mainly be concentrated in the Asian region. Especially in China, brushless motor technology has gradually matured, and the prices of both motors and drivers have dropped to a level where they can be widely applied, thus expanding the application scenarios of brushless motors. As a key component in the brushless motor system, the control chip precisely controls the current and voltage of the motor by receiving feedback signals from the rotor position, achieving efficient operation and precise control of the motor.
At present, the control of DC brushless motors mainly falls into two categories: square wave control (trapezoidal wave control) and sine wave control. What are the principles of these two control methods respectively?
    (1)Square wave control: The position of the motor rotor is obtained through a Hall sensor, and then six commutations are carried out within a 360° electrical cycle based on the rotor's position (once every 60°). At each commutation position, the motor outputs a force in a specific direction. Therefore, it can be said that the position accuracy of square wave control is electrical 60°. Since the phase current waveform of the motor is close to a square wave under this control method, it is called square wave control.
    (2) Sine wave control: SVPWM waves are used, and the output is a three-phase sine wave voltage. The motor phase current is a sine wave current. It can be considered that multiple continuous commutation changes have occurred within one electrical cycle without sudden changes in commutation current. Obviously, compared with square wave control, sine wave control has smaller torque fluctuations, less current harmonics, and feels more "delicate" when controlled. High integration has always been the goal that the integrated circuit design industry is constantly exploring. As for the dedicated chips for motor drive control, if a single chip can integrate more devices and functions, when applied to specific downstream products, it can greatly simplify the peripheral circuits, reduce peripheral devices, better meet the terminal application requirements, achieve cost reduction and efficiency improvement, and enhance the reliability of the overall solution. Shenzhen Siyuante Technology Co., Ltd. is dedicated to promoting fully integrated three-phase DC brushless motor driver chips with built-in MOS+ pre-drive + algorithm. The entire series of products only require a few resistors and capacitors for peripheral use. The selection list is as follows: