By Steve Bush 27th March 2018
Allegro MicroSystems has announced a family of current sensor ICs for AC or DC current sensing with 200kHz bandwidth and 2.5µs response time – “the fastest response time of an IC ever offered in the custom CB package,” said the firm.
“The response time enables over-current fault detection in safety-critical applications,” claimed the firm. Accuracy is +/- 2.1% over the lifetime of the IC.
+/-50, 100 and 200A versions are available. Absolute over-current capability is 1.2kA, but reduces depending on temperature, pulse duration and duty-cycle.
The devices are AEC-Q100 Grade 1 certified and qualified to UL60950-1 for up to 4.8kVrms dielectric strength.
ACS772 operates from a single 5V rail and ACS773 works from 3.3V.
Inside is a precision, low-offset linear Hall circuit, electrically isolated from the in-built copper conduction path located near the die. Applied current flowing through the conduction path generates a magnetic field which the Hall IC converts into a proportional voltage using a low-offset, chopper-stabilised BiCMOS circuitry, programmed for accuracy at the factory.
Internal conductive path resistance is typically 100μΩ and “the thickness of the copper conductor allows survival of the device at high over-current conditions”, said Allegro.
Proprietary digital temperature compensation technology is included.
Immunity to current conductor dV/dt and stray electric fields is improved by a proprietary integrated shield – improving output voltage ripple and offset drift in high-side, high-voltage applications.
The CB package is Pb-free with leads plated with 100% matt-tin and the lead-frame is oxygen-free copper.
Automotive and industrial applications are expected in motor control, load detection, load management and PSUs including dc-dc converters.
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