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Differential 4800V isolation current sensor IC has dual configurable over-current fault outputs

Differential 4800V isolation current sensor IC has dual configurable over-current fault outputs

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By Nick Flaherty



The ACS720 provides high isolation of 4800VDC with a reduced bill of materials made possible by the proprietary IC SOIC-16W package. The sensor works off a single 5 V supply while maintaining an output voltage swing from 0 to 3 V, with a stable zero current output of 1.5 V.  This allows the ACS720 to operate off a 5 V supply while having an output which is compatible with typical 3.3 V ADCs found on many MCUs. Furthermore, the ACS720’s high PSRR rejects the noise often found on the supplies in the power section of the PCB or system, maintaining high accuracy in noisy industrial environments.

The device has dual fault functions that are user configurable.  Fast and slow fault output allow for short-circuit and overcurrent fault detection. A user-created resistor divider from the power supply is used to set the fault level. The fault outputs are open drain, allowing the user to pull them up to a compatible voltage for the MCU and a simple logical OR of multiple sensor fault outputs.

The ACS720 also integrates differential current sensing, which rejects external magnetic fields, greatly simplifying board layout in three-phase motor applications.  Near closed-loop accuracy is achieved in this open-loop sensor IC due to Allegro’s patented, digital temperature compensation, offering a smaller and more economical solution for many current sensing applications that traditionally rely on closed-loop core based sensors.

The ACS720 is provided in a small surface-mount SOIC16 package. The leadframe is plated with 100% matt tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes.  Internally, the device is Pb-free, except for flip-chip high-temperature Pb based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory.

www.allegromicro.com

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