2015年5月13日 星期三

PCIM: Surface mount current sensor has 4.8kV isolation

imgresThe ACS722 and ACS723 Hall-effect current sensor ICs from Allegro MicroSystems Europe are being offered in a new high-isolation SOIC16 package.

It is a low-profile surface-mount package which provides a 4,800V RMS isolation rating, which is the highest available from the supplier’s family of surface-mount current sensor ICs.

Each device consists of a low-offset, linear Hall sensor circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage.

A proportional voltage is provided by the low-offset, chopper-stabilised BiCMOS Hall IC, which includes digital temperature compensation.

The output of the device has a positive slope when an increasing current passes through the primary copper conduction path, which is the path used for current sensing.

The internal resistance of this conductive path is typically 0.85 milliohms, providing low power loss. The terminals of the conductive path are electrically isolated from the sensor leads, allowing the current sensor ICs to be used in high-side current sense applications without the use of high-side differential amplifiers or other costly isolation techniques.

Typical applications include motor control, solar inverters, home automation and monitoring as well as those applications requiring reinforced isolation ranges.



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