ACS711 Hall Effect Linear Current Sensor with Overcurrent Fault Output for <100 V Isolation Applications Features and Benefits Description No external sense resistor required single package solution The Allegro ACS711 provides economical and precise 1.2 m internal conductor resistance reduced power loss solutions for AC or DC current sensing in <100 V audio, Economical low- and high-side current sensing communications systems, white goods, and automotive Output voltage proportional to AC or DC currents applications. The device package allows for easy implementation 12.5 A and 25 A full scale sensing ranges by the customer. Typical applications include circuit protection, Overcurrent FAULT trips and latches at 100% of full-scale current current monitoring, and motor and inverter control. Low-noise analog signal path 100 kHz bandwidth The device consists of a linear Hall sensor circuit with a copper Small footprint, low-profile SOIC8 package conduction path located near the surface of the die. Applied 3.0 to 5.5 V, single supply operation current flowing through this copper conduction path generates Integrated electrostatic shield for output stability a magnetic field which is sensed by the integrated Hall IC Factory-trimmed for accuracy and converted into a proportional voltage. Device accuracy is Extremely stable output offset voltage optimized through the close proximity of the magnetic signal Zero magnetic hysteresis to the Hall transducer. Ratiometric output from supply voltage 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 Package: 8 Lead SOIC (suffix LC) 4). The internal resistance of this conductive path is 1.2 m 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 thickness Approximate Scale 1:1 Continued on the next page Typical Application +3.3 V 8 1 VCC C IP+ BYP 0.1 F 2 IP+ 7 VIOUT C LOAD I ACS711 P R PU 6 FAULT 3 IP 4 5 IP GND Application 1. The ACS711 outputs an analog signal, V , IOUT that varies linearly with the bi-directional AC or DC primary current, I , within the range specified. The F A U L T pin trips P when I reaches 100% of its full-scale current. P ACS711-DS, Rev. 1Hall Effect Linear Current Sensor with Overcurrent ACS711 Fault Output for < 100 V Isolation Applications Description (continued) of the copper conductor allows survival of the device at up to 5 Internally, the device is Pb-free, except for flip-chip high-temperature overcurrent conditions. Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory. 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. Selection Guide T Optimized Accuracy Range, I Sensitivity, Sens A P 1 Part Number Packing (C) (A) (Typ) (mV/A) 2 ACS711ELCTR-12AB-T Tape and reel, 3000 pieces/reel 40 to 85 12.5 110 2 ACS711ELCTR-25AB-T Tape and reel, 3000 pieces/reel 40 to 85 25 55 2 ACS711KLCTR-12AB-T Tape and reel, 3000 pieces/reel 40 to 125 12.5 110 2 ACS711KLCTR-25AB-T Tape and reel, 3000 pieces/reel 40 to 125 25 55 1 Contact Allegro for additional packing options. 2 Sensitivity measured with V = 3.3 V. CC Absolute Maximum Ratings Characteristic Symbol Notes Rating Units Supply Voltage V 7V CC Reverse Supply Voltage V 0.1 V RCC Output Voltage V 7V IOUT Reverse Output Voltage V 0.1 V RIOUT VAC peak Working Voltage for Basic Isolation V Voltage applied between pins 1-4 and 5-8 100 WORKING or VDC F A U L T Pin V oltage V 7V FAULT Overcurrent Transient Tolerance I 1 pulse, 100 ms 100 A POC Range E 40 to 85 C Nominal Operating Ambient Temperature T A Range K 40 to 125 C Maximum Junction Temperature T (max) 165 C J Storage Temperature T 65 to 170 C stg Thermal Characteristics 1 Characteristic Symbol Test Conditions Value Units Package Thermal Resistance, R Mounted on Allegro ASEK 711 evaluation board 5 C/W JL Junction to Lead Package Thermal Resistance, Mounted on Allegro 85-0404 evaluation board, R 23 C/W JA 2 Junction to Ambient includes the power consumed by the board 1 Additional thermal information available on the Allegro website 2 2 The Allegro evaluation board has 1500 mm of 2 oz. copper on each side, connected to pins 1 and 2, and to pins 3 and 4, with thermal vias connecting the layers. Performance values include the power consumed by the PCB. Further details on the board are available from the Frequently Asked Questions document on our website. Allegro MicroSystems, Inc. 2 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000 www.allegromicro.com