Resource Magazine Online: Summer 2007

The Allegro® ACS712/13 Provides Economy and Precision
for AC or DC Current Sensing

Low noise 2,100 Vrms Hall-effect current sensors provide fully-integrated solutions in industry-leading, small-sized packages for a variety of applications.

The ACS712 is a nonintrusive means of measuring currents in a variety of applications, including circuit protection, motor control, and power monitoring. The ACS712 takes advantage of the Hall-effect to translate the magnetic field generated by the current flowing in the lead frame to a voltage that can be measured. The flip-chip architecture allows for a fixed distance from the current carrying leadframe to the hall element to optimize accuracy. The device also integrates an electrostatic shield to immunize the device from high dV/dt transients, making it suitable for directly monitoring currents in inductive loads. The ACS713 is the unidirectional version. A demo board is available.

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