Cảm biến dòng từ Hall Effect ACS712ELCTR-30A-T

ACS712ELCTR-30A-T

±30A 5V, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor 

Features Low-noise analog signal path Device bandwidth is set via the new FILTER pin 5 µs output rise time in response to step input current 80 kHz bandwidth Total output error 1.5% at TA = 25°C Small footprint, low-profile SOIC8 package 1.2 mΩ internal conductor resistance 2.1 kVRMS minimum isolation voltage from pins 1-4 to pins 5-8 5.0 V, single supply operation 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 Applications: Motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection

Specifications Category Sensors, Transducers Family Hall Effect / Magnetic Current - Sensing ±30A Accuracy ±1.5% Sensitivity 63 ~ 69 mV/A Current - Supply 10mA Sensor Type Hall Effect Voltage - Supply 4.5 V ~ 5.5 V Output 2.5V Frequency 80kHz Response Time 5µs Polarization Bidirectional Operating Temperature -40°C ~ 85°C Package / Case 8-SOIC (0.154", 3.90mm Width) Packaging Tape & Reel (TR) Standard Package 3,000 Add to   Monday, August 15, 2011

Description 
The Allegro® ACS712 provides economical and precise solutions for AC or DC current sensing in industrial, commercial, and communications systems. The device package allows for easy implementation by the customer. The device is not intended for automotive applications. For the automotive grade version, see ACS714.

 

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 mΩ 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 conductive path are electrically isolated from the sensor IC leads (pins 5 through 8). This allows the ACS712 current sensor IC to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques.