ALLEGRO A5936GLKTR-T

The A5936 three phase motor driver incorporates sinusoidal drive to minimize vibration for fan applications. A sinusoidal voltage profile is applied to the windings of the motor at startup to quickly and quietly start up and gradually ramp up the motor to desired speed. The motor speed is controlled by applying a duty cycle command to the PWM input. The PWM input is allowed to operate over a wide frequency range. The A5936 is available in a 10 - lead SSOP (suffix LN), and a 10 - lead eSOIC with exposed power pad (suffix LK). The packages are lead (Pb) free, with 100% matte - tin leadframe plating. The A5936 targets fan applications to meet the objectives of low audible noise, minimal vibration, and high efficiency. Allegro’s proprietary control algorithm results in a sinusoidal current wave shape that adapts to a variety of motor characteristics to dynamically optimize efficiency across a wide range of speeds. The speed of the fan can be controlled by voltage mode (control of power supply amplitude) or variable duty cycle PWM input. Use of the PWM input allows overall system cost savings by eliminating the requirement of an external variable power supply. Operation down to 4 V can be achieved to allow the IC to fit into legacy systems with voltage mode operation. Protection features include lock detection with restart, overcurrent limit, motor output short circuit, supply undervoltage monitor, and thermal shutdown.

• Standby mode
• Sensorless operation
• Low - noise sinusoidal modulation
• Quiet startup
• Low RDSON power MOSFETs
• Minimal external components
• PWM speed input
• FG speed output
• Lock detection
• Soft start
• Short - circuit protection (OCP)
• Overcurrent limit (OCL)