Current sensor ICs with high precision programming

Allegro MicroSystems has launched a family of fully integrated current sensor linear ICs in a core-less package designed to sense AC and DC currents up to 100A. The family’s Hall sensor technology incorporates common-mode field rejection to optimise performance in the presence of interfering magnetic fields generated by nearby current-carrying conductors.

The devices consist of a precision, low-offset linear Hall circuit with a copper conduction path located near the die. Applied current flowing through this copper conduction path generates a magnetic field which the Hall IC converts into a proportional voltage. Device accuracy is optimised through the close proximity of the primary conductor to the Hall transducer and factory programming of the sensitivity and zero-ampere output voltage.

Chopper-stabilised signal path and digital temperature compensation technology also contribute to the stability of the devices across the operating temperature range.

The internal resistance of this conductive path is typically 200μΩ. The thickness of the copper conductor allows survival of the devices at high overcurrent conditions.

The sensor ICs are suitable for automotive, industrial and computer applications, such as EPS, DC/DC converters, low side sensing in VFD and computer servers power supply output current sensing.

All leads are plated with 100% matt tin. The heavy gauge lead frame is made of oxygen-free copper. The ACS780/ACS781 are provided in an automotive-grade, 1.5mm thick sensor IC package.

Peggy Lee