High-accuracy addition to current sensor family
9 February 2005
Analogue, Mixed Signal, LSI
Memec has introduced the ACS754/5 series, a new high-accuracy addition to the Allegro family of Hall-effect current sensors.
Intended for precise current sensing in industrial, consumer, communications and automotive systems, the ACS754 devices are bi-directional sensors, while the ACS755 versions offer single-direction sensing with approximately twice the resolution of the ACS754.
The worst-case accuracy over the devices' whole measurement and temperature ranges is 5-6% in industrial applications and 7-10% in extended temperature automotive applications. Accuracy at 25°C is better than 1%. The devices provide 3 kV isolation and single voltage supply operation, while placing only 100 mΩ of resistance in the current path. Versions rated at 50 A, 100 A, 130 A, 150 A and 200 A are available in both industrial and automotive temperature ranges. In addition, the sensors are supplied in a lead-free, PC-mountable package measuring only 14 x 22 x 7 mm overall.
Each sensor consists of a precision linear Hall-effect integrated circuit optimised to an internal magnetic circuit to increase device sensitivity. The power lead frames are designed for low power loss and are electrically isolated from the sensor signal leads. This isolation allows ACS754/5 sensors to be used in applications requiring electrical isolation without the addition of other isolating components.
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