By Steve Bush 7th November 2019
Allegro is claiming isolation up to 1.3kV dc (650V reinforced) for a series of current sensors that work up 400A (ac and dc) and respond in 2.5µs for fast over-current detection.
Safety-critical applications such as vehicles and robotics are the target.
ACS772 is a 200kHz bandwidth automotive grade current sensor for 50 to 400A, with 100μΩ internal sensing for low power loss. +/-2.1% accuracy is claimed over the lifetime of the IC from room to hot temperature.
Operation is from 5V, and there is also a 3.3V version, the ACS773. Under-voltage lock-out is included.
Measurement is Hall-based, with output voltage proportional to current, provided by a low-offset, chopper-stabilised BiCMOS Hall IC, programmed for accuracy at the factory. “Proprietary digital temperature compensation technology greatly improves the IC accuracy and temperature stability,” according to the firm.
They come in Allegro’s CB package, in surface-mount and through-hole configurations (see photo)
“Many of our customers, especially in green energy applications, are looking for higher working voltages which can provide efficiency improvements and cost reductions in their systems,” said the firm’s director of current sensors Shaun Milano. “In solar applications for instance, raising the system voltage allows for longer strings, which eliminates significant wiring and connector combiner boxes. It also allows for longer panel strings with higher rated output inverters, which reduces losses and improves efficiency.”
Tagged with: Allegro MicroSystems current Hall sensor
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