Allegro MicroSystems, LLC Releases New Fully Integrated Precision Current Sensor ICs (ACS772 and ACS773)

New product is suitable for applications that need to detect up to 400A

Allegro MicroSystems, LLC announced the launch of a new family of current sensor ICs, the ACS772/73, which provides an economical and accurate solution for AC or DC current sensing. With a 200 kHz bandwidth, the new product is ideal for applications such as motor control, load detection and management, power supply and DC-DC converter control, and inverter control. The ACS772/73 has a response time of 2.5μs for overcurrent fault detection in safety-critical applications. This series of sensors can be applied in the automotive and industrial fields, with an accuracy of ±2.1% throughout its life cycle. The two current sensor ICs are powered from a single 5V (ACS772) and 3.3V (ACS773) power supply.

The ACS772/73 device includes a precision, low-bias linear Hall circuit with a copper conductive path near the chip. The current flowing through the copper conductive path generates a magnetic field that the Hall IC converts to a proportional voltage. By making the magnetic signal as close as possible to the Hall sensor, the accuracy of the device can be optimized. Low-offset chopper-stabilized BiCMOS Hall ICs are factory-precision programmed to provide a precise, proportional output voltage. The proprietary digital temperature compensation technology greatly improves the accuracy and temperature stability of the sensor IC. Allegro's proprietary integrated shield technology achieves low output voltage ripple and low offset drift in high-side and high-voltage applications, providing high-level immunity to current conductor dV/dt and stray electric fields. When the increased current flows through the primary copper conducting path for current sampling (from terminal 4 to terminal 5), the output of the device increases. The internal resistance of this conductive path is typically 100 μΩ and it has low power consumption. The larger thickness of the copper conductor allows the device to withstand high over-current conditions. The galvanic isolation between the terminals of the conductive path and the signal leads (pins 1 to 3) allows the ACS772/73 family of sensor ICs to be used in applications requiring electrical isolation without the use of optoisolators or other expensive isolation techniques.

The ACS772 and ACS773 current sensor ICs are packaged in Allegro's custom CB package and take up less space than competing current sensor module solutions. These devices also have a 2.5μS response time and are the fastest response time in Allegro's custom CB package. All devices are fully calibrated at the factory and are all lead-free products. All leads are 100% matte tin plated and the heavier standard size lead frames are made of oxygen free copper.

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Author：Brittany Antonia （The author of article owns the copyright.）