A3959SLBTR

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The A3959SLBTR is a product of Allegro Microsystem, a leader in the development of advanced power and sensing solutions. The A3959SLBTR is a three-phase brushless DC motor driver that provides excellent motor control performance, making it ideal for motor control applications such as automotive, industrial automation, and home appliance applications. It was designed for cost-effective motor control by providing a cost-competitive device for various motor control applications. This article provides an overview of the A3959SLBTR, its application field and working principle.

Application Field of A3959SLBTR

The A3959SLBTR is an integrated three-phase brushless DC (BLDC) motor pre-driver with a input voltage range of 8 V to 32 V and a 3.5 A peak current drive capability. This pre-driver offers an ideal solution for controlling and driving serve and small BLDC motors in many applications like motors for cooling fans, consumer, motor sports, and automotive applications. The A3959SLBTR integrates complete motor control, including voltage regulator and current sense transistor, into a single IC package, which provides a cost-effective design solution and simplifies the circuit. The integrated 300 mΩ power MOSFETs reduce power losses and offer efficient switching. Low power consumption also makes the A3959SLBTR a suitable choice for battery-powered applications. The A3959SLBTR has an operating temperature range of -40°C to +150°C, making it an ideal choice for high temperature applications, such as automotive applications.

Working Principle of A3959SLBTR

The A3959SLBTR is a low-side pre-driver configured as an H-bridge and is optimized for 3-phase BLDC motors. The A3959SLBTR provides a configurable PWM frequency and duty cycle that are optimized for motor efficiency. The A3959SLBTR works with a 6-step motor commutation and a current sense resistor. It also has two half-bridge outputs that allow for speed and direction control of the motor, as well as brake engagement. In addition, the A3959SLBTR integrates an on-resistance (RDS(on)) Sense amplifier for current sensing applications. The A3959SLBTR also provides two Fault Outputs which indicate the presence of an over-temperature condition or a shorted or stuck low MOSFET.

The A3959SLBTR requires a minimum of five I/O signals during operation; FS, OUTA/B, ISNS, and enable. An external resistor (RSNS) connected to the ISNx pin mainly determines the operational current of the low-side switch, thereby optimizing the speed and torque characteristics of the motor. The A3959SLBTR also features an active overcurrent protection that can respond faster to overcurrent conditions, which helps to improve the reliability and robustness of the system.

Conclusion

The A3959SLBTR is a three-phase brushless DC motor pre-driver designed for motor control applications. It provides an ideal solution for controlling and driving serve and small BLDC motors in many applications like motors for cooling fans, consumer, motor sports, and automotive applications. It has a voltage range of 8 V to 32 V and a 3.5 A peak current drive capability. In addition, it features active overcurrent protection, an on-resistance (RDS (on)) Sense amplifier for current sensing applications, and two Fault Outputs which indicates the presence of an over-temperature condition or a shorted or stuck low MOSFET. The integrated 300 mΩ power MOSFETs reduce power losses and offer efficient switching. Therefore, the A3959SLBTR provides cost-effective motor control for various motor control applications and can be used for a wide range of applications.

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