Current-sensor IC combines high accuracy with 120 kHz bandwidth and 3.3 V operation

29th March 2012
Written by : ES Admin
Current-sensor IC combines high accuracy with 120 kHz bandwidth and 3.3 V operation
The new ACS716 from Allegro MicroSystems Europe is an open-loop Hall-effect current-sensor IC that provides an accuracy and bandwidth performance that is near to that of closed-loop devices. The new device, which features a bandwidth of 120 kHz and is optimised for 3.3 V supply operation, is designed to provide an economical and precise solution to current-sensing applications in industrial, commercial and communications systems.
The ACS716 is offered in a small footprint surface-mount package that allows easy implementation in customer applications.

The ACS716 consists of a precision linear Hall sensor integrated circuit with a copper conduction path located near the surface of the silicon die.

Applied current flows through the copper conduction path, and the analogue output voltage from the Hall sensor IC linearly tracks the magnetic field generated by the applied current. The high accuracy of the ACS716 results from the proprietary packaging configuration of the device because the Hall element is situated extremely close to the current to be measured.

High-level immunity to current swings and stray electric fields is offered by Allegro’s proprietary integrated shield technology, which guarantees low ripple at the output and low offset drift in high-side high-voltage applications.

The voltage on the overcurrent input allows customers to define an overcurrent fault threshold for the device. When the current flowing through the copper conduction path exceeds this threshold, the open-drain overcurrent fault pin will switch to a logic low state.

The internal resistance of the copper path used for current sensing is typically 1 milliohm, leading to low power loss. In addition, the current conduction path is electrically isolated from the low-voltage sensor inputs and outputs. This allows the ACS716 family to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques.

Factory programming of the linear Hall sensor IC within the ACS716 results in exceptional accuracy of both analogue and digital output signals.

The ACS716 is supplied in a small surface-mount SOIC16 package. The lead frame is plated with 100% matt tin, which is compatible with standard lead (Pb) free printed-circuit-board assembly processes.

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