ACS712 Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor Features and Benefits Description Low-noise analog signal path The Allegro ACS712 provides economical and precise Device bandwidth is set via the new FILTER pin solutions for AC or DC current sensing in industrial, commercial, 5 s output rise time in response to step input current and communications systems. The device package allows for 80 kHz bandwidth easy implementation by the customer. Typical applications Total output error 1.5% at T = 25C A include motor control, load detection and management, switch- Small footprint, low-profile SOIC8 package mode power supplies, and overcurrent fault protection. The 1.2 m internal conductor resistance device is not intended for automotive applications. 2.1 kVRMS minimum isolation voltage from pins 1-4 to pins 5-8 5.0 V, single supply operation The device consists of a precise, low-offset, linear Hall circuit 66 to 185 mV/A output sensitivity with a copper conduction path located near the surface of the Output voltage proportional to AC or DC currents die. Applied current flowing through this copper conduction Factory-trimmed for accuracy path generates a magnetic field which the Hall IC converts into a Extremely stable output offset voltage proportional voltage. Device accuracy is optimized through the Nearly zero magnetic hysteresis Ratiometric output from supply voltage close proximity of the magnetic signal to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed TV America for accuracy after packaging. Certificate Number: U8V 06 05 54214 010 The output of the device has a positive slope (>V ) IOUT(Q) when an increasing current flows through the primary copper conduction path (from pins 1 and 2, to pins 3 and 4), which is the path used for current sampling. The internal resistance of Package: 8 Lead SOIC (suffix LC) this conductive path is 1.2 m typical, providing low power loss. The thickness of the copper conductor allows survival of Continued on the next page Approximate Scale 1:1 Typical Application +5 V 8 1 VCC IP+ V 7 OUT 2 C VIOUT IP+ BYP 0.1 F I ACS712 P 6 3 FILTER IP C F 4 IP 5 1 nF GND Application 1. The ACS712 outputs an analog signal, V . OUT that varies linearly with the uni- or bi-directional AC or DC primary sampled current, I , within the range specified. C P F is recommended for noise management, with values that depend on the application. ACS712-DS, Rev. 15Fully Integrated, Hall Effect-Based Linear Current Sensor IC ACS712 with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor Description (continued) The ACS712 is provided in a small, surface mount SOIC8 package. the device at up to 5 overcurrent conditions. The terminals of the The leadframe is plated with 100% matte tin, which is compatible conductive path are electrically isolated from the signal leads (pins with standard lead (Pb) free printed circuit board assembly processes. 5 through 8). This allows the ACS712 to be used in applications Internally, the device is Pb-free, except for flip-chip high-temperature requiring electrical isolation without the use of opto-isolators or Pb-based solder balls, currently exempt from RoHS. The device is other costly isolation techniques. fully calibrated prior to shipment from the factory. Selection Guide T Optimized Range, I Sensitivity, Sens A P Part Number Packing* (C) (A) (Typ) (mV/A) ACS712ELCTR-05B-T Tape and reel, 3000 pieces/reel 40 to 85 5 185 ACS712ELCTR-20A-T Tape and reel, 3000 pieces/reel 40 to 85 20 100 ACS712ELCTR-30A-T Tape and reel, 3000 pieces/reel 40 to 85 30 66 *Contact Allegro for additional packing options. Absolute Maximum Ratings Characteristic Symbol Notes Rating Units Supply Voltage V 8V CC Reverse Supply Voltage V 0.1 V RCC Output Voltage V 8V IOUT Reverse Output Voltage V 0.1 V RIOUT Output Current Source I 3mA IOUT(Source) Output Current Sink I 10 mA IOUT(Sink) Overcurrent Transient Tolerance I 1 pulse, 100 ms 100 A P Nominal Operating Ambient Temperature T Range E 40 to 85 C A Maximum Junction Temperature T (max) 165 C J Storage Temperature T 65 to 170 C stg Isolation Characteristics Characteristic Symbol Notes Rating Unit Agency type-tested for 60 seconds per Dielectric Strength Test Voltage* V 2100 VAC ISO UL standard 60950-1, 1st Edition For basic (single) isolation per UL standard Working Voltage for Basic Isolation V 354 VDC or V WFSI pk 60950-1, 1st Edition For reinforced (double) isolation per UL standard Working Voltage for Reinforced Isolation V 184 VDC or V WFRI pk 60950-1, 1st Edition * Allegro does not conduct 60-second testing. It is done only during the UL certification process. Parameter Specification CAN/CSA-C22.2 No. 60950-1-03 Fire and Electric Shock UL 60950-1:2003 EN 60950-1:2001 Allegro MicroSystems, LLC 2 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000 www.allegromicro.com