ACS72981 High-Precision Linear Hall-Effect-Based Current Sensor IC
ACS72981: High-Precision Linear Hall-Effect-Based Current Sensor IC With 200 μΩ Current Conductor
The ACS72981 family of current sensor ICs provides economical and precise solutions for AC or DC current sensing. A 250 kHz bandwidth makes it ideal for motor control, load detection and management, power supply and DC-to-DC converter control, and inverter control. The response time enables overcurrent fault detection in safety-critical applications.
The device consists of a precision, low-offset linear Hall circuit with a copper conduction path located near the die. Applied current flowing through this copper conduction path generates a magnetic field which the Hall IC converts into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic signal to the Hall transducer. A precise, proportional output voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy at the factory. Proprietary digital temperature compensation technology greatly improves the zero output voltage and output sensitivity accuracy over temperature and lifetime.
The output of the device increases when an increasing current flows through the primary copper conduction path (from terminal 5 to terminal 6), which is the path used for current sampling. The internal resistance of this conductive path is 200 μΩ typical, providing low power loss and increasing power density in the application.
The sensor employs differential sensing techniques that virtually eliminate output disturbance due to common-mode interfering magnetic field.
The thickness of the copper conductor allows survival of the device at high overcurrent conditions. The terminals of the conductive path are electrically isolated from the signal leads (pins 1 through 3).
The device is fully calibrated prior to shipment from the factory. The ACS72981 family is lead (Pb) free. All leads are plated with 100% matte tin, and there is no Pb inside the package. The heavy gauge leadframe is made of oxygen-free copper.
|Sensing Current Type
|Current - Supply
|Operating Supply Voltage
|DC / AC
|-40 °C ~ 125 °C(TA)
|4.5V ~ 5.5V
|7-pin PSOF package (suffix LR)
Allegro Micro Systems
A33115 Precision TMR Angle Sensor
360° angle sensor that provides high-resolution angular position information.
Integrated shield virtually eliminates capacitive coupling from current conductor to die, greatly suppressing output noise due to high dv/dt transients.
A31010 Unidirectional Linear Hall-Effect Sensors
Provide a voltage output proportional to the applied magnetic field.
A89506 Full-Bridge PWM Gate Driver
Ideal for DC motors and actuators in conventional, hybrid, and electric vehicles.
Brushless DC Drivers
Engineered to meet market challenges, delivering cost-optimized systems and improved time-to-market.
Brush DC Drivers
Broad portfolio of safe and robust brush DC solutions with both integrated and MOSFET gate drivers.
Stepper Motor Drivers
Delivers quiet, efficient, smooth motion to minimize noise and vibration in stepper motor designs.
Sensor Interface ICs
Allegro’s interface sensor ICs for speed and pressure sensors deliver fast and accurate output ideal for today’s demanding, space-constrained automotive and industrial applications.
Allegro’s multiple-output DC/DC regulators enable smart and robust industrial designs.