ACS756 Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Features and Benefits Description Industry-leading noise performance through proprietary The Allegro ACS756 family of current sensor ICs provides amplifier and filter design techniques economical and precise solutions for AC or DC current sensing Total output error 0.8% at T = 25C in industrial, automotive, commercial, and communications A Small package size, with easy mounting capability systems. The device package allows for easy implementation by Monolithic Hall IC for high reliability the customer. Typical applications include motor control, load Ultra-low power loss: 130 internal conductor resistance detection and management, power supplies, and overcurrent 3 kV minimum isolation voltage from fault protection. RMS pins 1-3 to pins 4-5 The device consists of a precision, low-offset linear Hall 3.0 to 5.0 V, single supply operation circuit with a copper conduction path located near the die. 3 s output rise time in response to step input current Applied current flowing through this copper conduction path 20 or 40 mV/A output sensitivity generates a magnetic field which the Hall IC converts into a Output voltage proportional to AC or DC currents proportional voltage. Device accuracy is optimized through the Factory-trimmed for accuracy close proximity of the magnetic signal to the Hall transducer. Extremely stable output offset voltage A precise, proportional voltage is provided by the low-offset, Nearly zero magnetic hysteresis chopper-stabilized BiCMOS Hall IC, which is programmed TV America for accuracy at the factory. Certificate Number: U8V 09 05 54214 021 The output of the device has a positive slope (>V / 2) when an CC increasing current flows through the primary copper conduction Package: 5 pin package (suffix PFF) path (from terminal 4 to terminal 5), which is the path used for current sampling. The internal resistance of this conductive path is 130 typical, providing low power loss. The thickness of the copper conductor allows survival of the device at up to 5 overcurrent conditions. The terminals of the 1 Continued on the next page Additional leadforms available for qualifying volumes Typical Application +5 V 1 4 VCC IP+ C BYP ACS756 0.1 F 2 I GND P C F 5 IP 3 VIOUT V OUT R F Application 1. The ACS756 outputs an analog signal, V , that OUT varies linearly with the uni- or bi-directional AC or DC primary sampled current, I , within the range specified. C is for optimal P F noise management, with values that depend on the application. ACS756-DS, Rev. 6Fully Integrated, Hall Effect-Based Linear Current Sensor IC ACS756 with 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Description (continued) conductive path are electrically isolated from the signal leads (pins The device is fully calibrated prior to shipment from the factory. 1 through 3). This allows the ACS756 family of sensor ICs to be The ACS75x family is lead (Pb) free. All leads are plated with 100% used in applications requiring electrical isolation without the use of matte tin, and there is no Pb inside the package. The heavy gauge opto-isolators or other costly isolation techniques. leadframe is made of oxygen-free copper. Selection Guide Primary Sampled T OP 1 2 Part Number Current , I Packing P (C) (A) ACS756SCA-050B-PFF-T 20 to 85 50 ACS756SCA-100B-PFF-T 20 to 85 100 34 per tube ACS756KCA-050B-PFF-T 40 to 125 50 1 Additional leadform options available for qualified volumes 2 Contact Allegro for additional packing options. Absolute Maximum Ratings Characteristic Symbol Notes Rating Units Forward Supply Voltage V 8V CC Reverse Supply Voltage V 0.5 V RCC Forward Output Voltage V 28 V IOUT Reverse Output Voltage V 0.5 V RIOUT Voltage applied between pins 1-3 and 4-5 Working Voltage for Reinforced Isolation V tested at 3000 VAC for 1 minute according to 353 VDC / V WORKING-R pk UL standard 60950-1 Voltage applied between pins 1-3 and 4-5 Working Voltage for Basic Isolation V tested at 3000 VAC for 1 minute according to 500 VDC / V WORKING-B pk UL standard 60950-1 Output Source Current I VIOUT to GND 3 mA OUT(Source) Output Sink Current I VCC to VIOUT 1 mA OUT(Sink) Range K 40 to 125 C Nominal Operating Ambient Temperature T OP Range S 20 to 85 C Maximum Junction T (max) 165 C J Storage Temperature T 65 to 165 C stg Allegro MicroSystems, Inc. 2 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000 www.allegromicro.com