Allegro Linear Hall Sensor Enables High-Precision Control for Brushless DC Motors

As a high-efficiency power core, brushless DC motors (BLDC) are widely used in industrial automation, automotive electronics, and consumer electronics. Their typical architecture includes a controller, drive circuit, and position detection unit, where the accuracy of the position sensor directly determines motor performance. Traditional solutions such as optical encoders or switch-mode Hall sensors face challenges like large size and limited accuracy. Linear Hall sensors, through non-contact magnetic sensing, enable continuous angular measurement with a resolution of 0.1°, while their monolithic integrated structure significantly enhances system reliability, making them an ideal choice for high-end BLDC motor position feedback.

Within a range of 250 Gauss, linear Hall sensors precisely match the air-gap magnetic field intensity of BLDC motors, achieving accurate position detection. Their core advantages are reflected in three aspects:

1. High Linearity Output (±1%): Ensures a strict proportional relationship between output voltage and magnetic field intensity across the entire range, avoiding control deviations caused by linearity errors.

2. Microsecond Response Speed: Meets the real-time control requirements of high-speed motors.

3. Wide Temperature Adaptability (-40°C to 150°C): Guarantees stable motor operation in high-temperature environments.For example, in servo motors, this sensor can detect micron-level displacement changes, enabling precise torque control.

Allegro's A31010SEHALT-4 is a high-performance linear Hall sensor with an operational magnetic field range of ±250 Gauss, packaged in an ultra-thin TSOT form factor. The device demonstrates significant performance advantages:

1. Sensitivity: 5 mV/Gauss, 20% higher than industry standards.

2. Zero Drift: ±1 Gauss (-40°C to 150°C), 50% improvement over conventional products.

3. Supply Voltage: Compatible with 3.3V/5V dual voltages, simplifying circuit design.

4. Output Characteristics: 0.5–4.5V analog output, compatible with mainstream MCU ADC interfaces.

The sensor integrates an internal temperature compensation circuit, maintaining excellent zero-point stability across the full temperature range. Its unique chopper-stabilization technology effectively eliminates offset voltage, ensuring detection accuracy in motor electromagnetic interference environments. As an authorized agent of Allegro, MANDU provides comprehensive technical support, including magnetic field simulation, PCB layout optimization, sample applications, and mass production assurance services.

For BLDC motor designers, the Allegro A31010SEHALT-4 linear Hall sensor, with its exceptional accuracy, temperature stability, and anti-interference capability, is a key solution for enhancing motor performance. Its compact package is suitable for space-constrained applications, while its high-reliability design ensures long-term stable operation. Through MANDU's professional services, customers receive end-to-end support from prototype design to mass production.

About Mandu Technology

Shenzhen Mandu Technology Co., Ltd. has steadfastly centered its operations on the distribution of high-performance, high-quality, and highly reliable integrated circuit products. Its portfolio encompasses memory chips, differential crystal oscillators, and MCU microcontrollers, while progressively integrating analog signal chain products. The company prides itself on delivering comprehensive and cost-effective solutions to its customers. Its products find applications across a broad spectrum of industries, including but not limited to network communication, industrial control, robotics, medical equipment, personal health, and numerous other fields.

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