AMT49406GESSR

The AMT49406 is a 3-phase, sensorless, brushless DC (BLDC) motor driver (gate driver) which can operate from 5.5 to 50 V. A field-oriented control (FOC) algorithm is fully integrated to achieve the best efficiency and acoustic noise performance. The device optimizes the motor startup performance in a stationary condition, a windmill condition, and even in a reverse windmill condition. Motor speed is controlled through analog, PWM, or CLOCK input. Closed-loop speed control is optional, and RPM-to-clock frequency ratio is programmable. A simple I2C interface is provided for setting motor-rated voltage, rated current, rated speed, resistance, and startup profiles. The AMT49406 is available in a 24-contact 4 mm×4 mm QFN with exposed thermal pad (suffix ES) and a 24-lead TSSOP with exposed thermal pad (suffix LP). These packages are lead (Pb) free, with 100% matte-tin leadframe plating. The AMT49406 is a three-phase BLDC controller with integrated gate driver. It operates from 5.5 to 50 V and targets pedestal fan, ceiling fan, and ventilation fan applications. The integrated field-oriented control (FOC) algorithm achieves the best efficiency and dynamic response and minimizes acoustic noise. The proprietary non-reverse startup algorithm improves startup performance. The motor will start up towards the target direction after power-up without reverse shaking or vibration. The Soft-On Soft-Off (SOSO) feature gradually increases the current to the motor at “on” command (windmill condition), and gradually reduces the current from the motor at the “off” command, further reducing the acoustic noise and operating the motor smoothly. PWM Mode: The motor speed is controlled by the PWM duty cycle on the SPD pin, and higher duty cycle represents higher speed demand. If closed-loop speed is disabled, the output amplitude will be proportional to the PWM duty cycle. If closed-loop speed is enabled, the motor speed is proportional to the PWM duty cycle, and 100% duty represents the rated speed of the motor, which can be programmed in the EEPROM. Analog Mode: The motor speed is controlled by the analog voltage on the SPD pin, with higher voltage representing higher speed demand. If closed-loop speed is disabled, the output amplitude will be proportional to the analog voltage input. If closed-loop speed is enabled, the motor speed is determined by the formula. CLOCK Mode: In the clock speed control mode, the closed-loop speed is always enabled. Higher frequency on the SPD pin will drive a higher motor speed according to the formula. Speed demand is provided via the SPD pin. Three speed control modes are selectable through the EEPROM. The AMT49406 also features a closed-loop speed function, which can be enabled or disabled via the EEPROM. If the speed demand is less than the programmed threshold, the motor will stop.

Applications

• Ceiling fans
• Pedestal fans
• Bathroom exhaust fans
• Home appliance fans and pumps

Key features

• Code-free sensorless field-oriented control (FOC)
• Proprietary non-reverse fast startup
• Soft-On Soft-Off (SOSO) for quiet operation
• Analog / PWM / Clock mode speed control
• Closed-loop speed control
• Configurable current limit
• Windmill startup operation
• Lock detection
• Short-circuit protection (OCP)
• Brake and direction inputs