Differential current sensor IC offers 4.8 kV isolation

Differential current sensor IC offers 4.8 kV isolation

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Allegro MicroSystems’ latest differential, high isolation current sensor IC has integrated, low power conductors and up to 4800 VRMS galvanic isolation, with user settable over-current fault outputs.
By Peter Clarke

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With multiple programmable fault levels, and intended for industrial and consumer applications with a focus on motor control and power inverter stage applications, the ACS720 provides high isolation with a reduced bill of materials, made possible by Allegro’s SOIC-16W package. The ACS720 works off a single 5V supply while maintaining an output voltage swing from 0 to 3V, with a stable zero current output of 1.5V. This allows the ACS720 to operate off a 5V supply while having an output which is compatible with typical 3.3V ADCs found on many MCUs. 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 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-supplied resistor divider from the power supply of the ACS720 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. The open-drain outputs also allow for implementing 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 digital temperature compensation, ultimately offering a smaller and more economical solution for many current sensing applications that traditionally rely on closed-loop core based sensors.

 

Allegro MicroSystems; www.allegromicro.com

 

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