ACS712电流传感器说明书.pdf

Approximate Scale 1:1 Application 1. The ACS712 outputs an analog signal, VOUT . that varies linearly with the uni- or bi-directional AC or DC primary sensed current, IP , within the range specified. CF is recommended for noise management, with values that depend on the application. ACS712 Description The Allegro ACS712 provides economical and precise solutions for AC or DC current sensing in industrial, automotive, commercial, and communications systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection. The device consists of a precise, 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 signal to the Hall transducer. A precise, 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 (VIOUT(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 sensing. The internal resistance of this conductive path is 1.2 m typical, providing low power ACS712-DS Features and Benefits Low-noise analog signal path Device bandwidth is set via the new FILTER pin 5 s output rise time in response to step input current 50 kHz bandwidth Total output error 1.5% at TA = 25C, and 4% at 40C to 85C Small footprint, low-profile SOIC8 package 1.2 m internal conductor resistance 2.1 kVRMS minimum isolation voltage from pins 1-4 to pins 5-8 5.0 V, single supply operation 66 to 185 mV/A output sensitivity Output voltage proportional to AC or DC currents Factory-trimmed for accuracy Extremely stable output offset voltage Nearly zero magnetic hysteresis Ratiometric output from supply voltage Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Continued on the next page Package: 8 pin SOIC (suffix LC) Typical Application IP+ IP+ IP IP IP 5 GND 2 4 1 3 ACS712 7 8 +5 V VIOUT VOUT 6 FILTER VCC CBYP 0.1 F CF 1 nF Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor ACS712 2 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Selection Guide Part NumberPacking* TOP (C) Optimized Range, IP (A) Sensitivity, Sens (Typ) (mV/A) ACS712ELCTR-05B-TTape and reel, 3000 pieces/reel40 to 855185 ACS712ELCTR-20A-TTape and reel, 3000 pieces/reel40 to 8520100 ACS712ELCTR-30A-TTape and reel, 3000 pieces/reel40 to 853066 *Contact Allegro for additional packing options. loss. The thickness of the copper conductor allows survival of the device at up to 5 overcurrent conditions. The terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS712 current sensor to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques. The ACS712 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. Internally, the device is Pb-free, except for flip-chip high-temperature Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory. Description (continued) Absolute Maximum Ratings CharacteristicSymbolNotesRatingUnits Supply Voltage VCC8V Reverse Supply VoltageVRCC0.1V Output VoltageVIOUT8V Reverse Output VoltageVRIOUT0.1V Output Current Source IIOUT(Source) 3mA Output Current Sink IIOUT(Sink)10mA Overcurrent Transient ToleranceIP 100 total pulses, 250 ms duration each, applied at a rate of 1 pulse every 100 seconds. 60A Maximum Transient Sensed CurrentIR(max)Junction Temperature, TJ < TJ(max)60A Nominal Operating Ambient TemperatureTARange E40 to 85C Maximum JunctionTJ(max)165C Storage TemperatureTstg65 to 170C TV America Certificate Number: U8V 06 05 54214 010 ParameterSpecification Fire and Electric Shock CAN/CSA-C22.2 No. 60950-1-03 UL 60950-1:2003 EN 60950-1:2001 Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor ACS712 3 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 VCC (Pin 8) (Pin 7) VIOUT RF(INT) GND (Pin 5) FILTER (Pin 6) Dynamic Offset Cancellation IP+ (Pin 1) IP+ (Pin 2) IP (Pin 3) IP (Pin 4) Sense Trim Signal Recovery S。