Current sensor supplies 1-MHz analog output

Allegro MicroSystems’ ACS730 Hall-effect current sensor provides 1-MHz bandwidth and a fast response time of 210 ns. The device comes in versions that offer primary sensed current of ±20 A, ±40 A, and ±50 A with sensitivity of 100 mV/A, 50 mV/A, and 40 mV/A, respectively.

Galvanically isolated, the ACS730 can be used for AC or DC current sensing in industrial, commercial, and communication systems. It comprises a low-offset linear Hall sensor circuit with a copper conduction path located near the surface of the die. Device accuracy is optimized through the close proximity of the magnetic field to the Hall transducer.

The output of the ACS730 has a positive slope when an increasing current flows through the primary copper conduction path, which is the path used for current sensing. The internal resistance of this conductive path is typically 1.2 mΩ. Terminals of the conductive path are electrically isolated from the sensor leads, allowing the ACS730 to be used in high-side current-sense applications without the need for high-side differential amplifiers or other costly isolation techniques.