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November 30, 2010
Worcester, MA – Allegro MicroSytems, LLC introduces a new Hall-effect linear current sensor IC that provides economical and precise solutions for AC or DC current sensing in low-voltage audio, communications systems, white goods, and automotive applications. Typical applications include circuit protection, current monitoring, and motor and inverter control.
Allegro’s device consists of a linear Hall sensor circuit with a copper conduction path located near the surface of 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 optimized through the close proximity of the magnetic signal to the Hall transducer. The output of the device has a positive slope proportional to the current flow from IP+ to IP– (pins 1 and 2, to pins 3 and 4). The internal resistance of this conductive path is 1.2 mΩ typical, providing a non-intrusive measurement interface that saves power in applications that require energy efficiency.
The ACS711 is optimized for low-side current sensing applications, although the terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8), providing sufficient internal creepage and clearance dimensions for a low AC or DC working voltage applications. The thicknessof the copper conductor allows survival of the device at up to 5× overcurrent conditions.
The ACS711 is provided in a small, surface mount SOIC8 package. The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes. Internally, the device is Pb-free, except for flip-chip high-temperature Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory.
Allegro MicroSystems is redefining the future of power and sensing technologies. From green energy to advanced mobility and motion control systems, our team is passionate about developing intelligent solutions that move the world forward and give our customers a competitive edge. With global engineering, manufacturing and support, Allegro is a trusted partner to both large enterprises and regional market leaders worldwide. Visit www.allegromicro.com.