Allegro MicroSystems Europe has introduced two new families of high-performance low-noise Hall-effect current sensors featuring an isolation voltage of 2100 V r.m.s.. Each device is available in
±5 A, ±20 A or ±30 A versions, with corresponding sensitivity levels of 185, 100 or 66 mV/A.
The new devices, ACS712 (bidirectional) and ACS713 (unidirectional), have been developed to address the growing demand for low-cost, high-accuracy and compact current-sensing solutions with added functionality. The chip design has optimised parameters such as quiescent output voltage, sensitivity and temperature coefficient to minimise noise and total output error.
The combination of improved process performance, new design concepts and additional programming capability has resulted in a twofold reduction in noise compared with previous devices, says ST. The total output error is only 1,5% at room temperature and +4% in the industrial temperature range from -40 to
85°C. The devices also incorporate a filter pin that can be used to set the -3 dB point with a capacitor, reducing the number of external components required to improve sensor resolution.
The devices feature very fast response times, with nominal rise times for the 30 A device of 5 μs at an input current of 26,5 A and 2,5 μs at 10,6 A. Device accuracy is optimised through the close proximity of the magnetic signal to the Hall transducer. They also exhibit near-zero magnetic hysteresis.
The new sensors produce an analog signal output that varies linearly with the unidirectional or bidirectional AC or DC primary sensed current. The output has a positive slope when an increasing current flows through the primary copper conduction path used for current sensing. The terminals of the conductive path are electrically isolated from the sensor leads with an isolation voltage of 2,1 kV r.m.s.
The ACS712 and ACS713 come in surface mount SOIC8 package.
For more information contact Simon Churches, Arrow Altech Distribution, schurches@arrow.altech.co.za, +27 (0)11 923 9600.
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