Power Electronics

Hall-Effect Current Sensors Feature Reduced Noise

Allegro MicroSystems’ two high-performance, low-noise 2100-Vrms isolation current sensors, the ACS712 (bidirectional) and ACS713 (unidirectional), provide lower noise and higher accuracy than previous generation current sensors. These sensors also include an integrated shield, which effectively attenuates high dV/dt transients across the leadframe making this solution idea for motor control and high side current sense applications.

The ACS712 provides economical and precise solutions for ac or dc current sensing; the ACS713 provides dc current sensing only. Both devices consist of a precise, low-offset, linear Hall sensor circuit with a 1.2-mΩ 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. Available in an 8-pin SOIC package, pricing for both parts is $1.61 in 1000-piece quantities.

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