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Hall-effect current sensor IC is optimised for 3.3 V operation at high temperatures

May 22, 2012 // Christoph Hammerschmidt

Hall-effect current sensor IC is optimised for 3.3 V operation at high temperatures

The new ACS759 from Allegro MicroSystems is a high-current/high-temperature linear Hall-effect current sensor IC that provides an economical and precise solution for AC or DC current sensing in 3.3 V supply applications. The device is targeted at the automotive and industrial markets.

The device consists of a precision, low-offset linear Hall sensor circuit with a copper conduction path located near the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage.

Device accuracy is optimised through the close proximity of the magnetic signal to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopper-stabilised BiCMOS Hall IC, which is programmed for accuracy at the factory.

High-level immunity to current conductor dV/dt and stray electric fields, offered by Allegro proprietary integrated shield technology, guarantees low ripple at the output and low-offset drift in high-side high-voltage applications. The output of the device has a positive slope when an increasing current flows through the primary copper conduction path used for current sensing.

The internal resistance of this conductive path is typically 100 microhms, providing low power loss. The thickness of the copper conductor allows for 200 A continuous current sensing applications and survival to much higher transient currents.

The terminals of the conductive path are electrically isolated from the sensor leads, allowing the ACS759 family of sensors to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques. The device is fully calibrated prior to shipment from the factory.

Typical applications include motor control, load detection and management, power supply and DC/DC converter control, inverter control, and overcurrent fault detection.

The ACS759 sensor IC is lead (Pb) free. All leads are plated with 100% matt tin, and there is no lead inside the package. The heavy-gauge leadframe is made of oxygen-free copper. The device is available in a small 5-pin CB package with easy mounting capability.


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