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1MHz current sensor has 3600V isolation

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By Nick Flaherty


The ACS732 and ACS733 Hall effect current sensor ICs have 3600 VRMS galvanic isolation as well as user-configurable overcurrent fault detection.

This makes them suited to high-frequency transformer and current transformer replacement in applications running at high voltages in markets such as automotive, industrial, commercial, and communications systems. They may be used in motor control, load detection and management, switch-mode power supplies, and overcurrent fault protection applications. The devices are fully calibrated at the Allegro factory to provide a high accuracy solution over the entire operating temperature range.

The fully integrated wide body SOIC-16 package has a typical resistance of 1 mΩ, providing low power loss and reduced bill of materials that allows for easy implementation. Applied current flowing through the copper conduction path generates a magnetic field that is sensed by the IC and converted to a proportional voltage. Current is sensed differentially in order to reject external common-mode fields. The current-carrying pins (pins 1 through 8) are electrically isolated from the sensor leads (pins 9 through 16). This allows the devices to be used in high-side current sensing applications without the use of high-side differential amplifiers, isolators, or other costly isolation techniques.

The ACS732 and ACS733 are provided in a small, low profile, surface-mount SOIC-16 wide-body package. This package is lead (Pb) free, with 100% matt-tin leadframe plating (suffix –T). 

www.allegromicro.com


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