February 24, 2015
Worcester, MA – Allegro MicroSystems, LLC announces two new current sensor ICs that are economical, high isolation solutions for AC or DC current sensing in industrial, commercial, and communications systems. Allegro’s ACS717 and ACS718 devices have a very small package that is ideal for space constrained applications, though the wide-body provides the creepage and clearance needed for high isolation. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection.
Both devices consist of a low-offset, 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 field to the Hall transducer. A proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy after packaging. The output of the device has a positive slope when an increasing current flows through the primary copper conduction path (from pins 1 through 4, to pins 5 through 8), which is the path used for current sensing. The internal resistance of this conductive path is 0.85 mΩ typical, providing low power loss.
The terminals of the conductive path are electrically isolated from the sensor leads (pins 10 through 15). This allows the ACS717 and ACS718 current sensor ICs to be used in high-side current sense applications without the use of high-side differential amplifiers or other costly isolation techniques.
Both devices are offered in a small, low profile surface mount SOICW16 package (suffix MA). The devices are lead-free with 100% matte tin leadframe plating and are fully calibrated prior to shipment from the factory.
Allegro MicroSystems, LLC is a leader in developing, manufacturing and marketing high-performance semiconductors. Allegro's innovative solutions serve high-growth applications within the automotive market, with additional focus on office automation, industrial, and consumer/communications solutions. Allegro is headquartered in Worcester, Massachusetts (USA) with design, applications, and sales support centers located worldwide. Further information about Allegro can be found at www.allegromicro.com.