Sensors

High bandwidth sensors provide 3,600 VRMS isolation

22nd December 2017
Lanna Cooper

Allegro MicroSystems Europe has added a new generation of high bandwidth current sensor ICs to its existing family of devices. The Allegro ACS732 and ACS733 current sensor ICs provide a compact, fast, and accurate solution for measuring high frequency currents in DC/DC converters and other switching power applications. These devices are the first 1MHz offerings from Allegro to offer 3,600 VRMS galvanic isolation ratings. The current sensor ICs are Hall-effect-based and include user-configurable overcurrent fault detection.

These features make them suited for high frequency transformer and current transformer replacement in applications running at high voltages.

The ACS732 and ACS733 are suitable for all markets, including 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 1mΩ, 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).

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