ACS711Hall-Effect Linear Current Sensor withOvercurrent Fault Output for <100 V Isolation ApplicationsFEATURES AND BENEFITSDESCRIPTION • No external sense resistor required; single package solution • Reduced power loss: The Allegro™ ACS711 provides economical and precise □ 0.6 mΩ internal conductor resistance on EX package solutions for AC or DC current sensing in <100 V audio, □ 1.2 mΩ internal conductor resistance on LC package communications systems, and white goods. The device package • Economical low- and high-side current sensing allows for easy implementation by the customer. Typical • Output voltage proportional to AC or DC currents applications include circuit protection, current monitoring, • ±12.5 A and ±25 A full-scale sensing ranges on LC package and motor and inverter control. • ±15.5 A and ±31 A full-scale sensing ranges on EX package The device consists of a linear Hall sensor circuit with a copper • Overcurrent ¯F ¯A ¯U ¯L ¯T trips and latches at 100% of full-scale conduction path located near the surface of the die. Applied current current flowing through this copper conduction path generates • Low-noise analog signal path a magnetic field which is sensed by the integrated Hall IC • 100 kHz bandwidth • Small footprint, low-profile SOIC8 and QFN packages and converted into a proportional voltage. Device accuracy is • 3 to 5.5 V single supply operation optimized through the close proximity of the magnetic signal • Integrated electrostatic shield for output stability to the Hall transducer. • Factory-trimmed for accuracy The output of the device has a positive slope proportional to • Extremely stable output offset voltage the current flow from IP+ to IP– (pins 1 and 2, to pins 3 and • Zero magnetic hysteresis • Ratiometric output from supply voltage 4). The internal resistance of this conductive path is 0.6 mΩ for the EX package, and 1.2 mΩ for the LC package, providing a non-intrusive measurement interface that saves power in PACKAGES: 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 IC leads, providing sufficient internal creepage and clearance dimensions for a low AC or DC working voltage applications. The thickness 12-contact QFN of the copper conductor allows survival of the device at up to 3 mm × 3 mm × 0.75 mm 8-pin SOICN (EX package) with internally fused path Continued on the next page… (LC package) Not to scale Typical Application +3.3 V IP+ VCC CBYP 0.1 μF Application 1. The ACS711 outputs IP+ an analog signal, VIOUT , that varies VIOUT linearly with the bi-directional AC or C DC primary current, I I LOAD P , within the P ACS711 R range specified. The ¯F ¯A ¯U ¯L ¯T pin trips PU when IP reaches ±100% of its full- FAULT scale current. IP– IP– GND ACS711A-DS, Rev. 4 June 23, 2017
