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IMC-Hall, contactless current sensor is custom programmable

Posted: 29 Nov 2010 ?? ?Print Version ?Bookmark and Share

Keywords:contact-less current sensor? Triaxis Hall technology?

Melexis drives the promotion of green solutions by opening new opportunities for contact-less current sensing in renewable energy applications, Hybrid Electric Vehicle (HEV) and Electric Vehicle (EV). Its MLX91206 is a customer programmable monolithic Sensor IC offering the Triaxis Hall technology.

The MLX91206 allows the user to construct small, economical current sensor solutions with quick response times. The chip also directly monitors the current flowing in an external conductor such as a bus bar or PCB track.

This novel contact-less current sensor is made of a CMOS Hall integrated circuit with a thin ferromagnetic layer structured on its surface. The integrated ferromagnetic (IMC) layer is used as a magnetic flux concentrator giving a high magnetic gain, which significantly increases the signal to noise ratio of the sensor. The sensor is ideal for DC and/or AC current measurements up to 90kHz with ohmic isolation, very low insertion loss, fast response time, small package size and low assembly cost prerequisites.

The MLX91206 addresses the demand for widespread use of electronics in automotive applications, renewable power conversion (solar / wind power), power supplies, motor control, and overload protection. Typical applications are found in Battery Current Monitoring, in Solar Power Converters and automotive inverters driving the traction motor in Hybrid Vehicles HEV/EV. The device allows over-voltage and reverse voltage protection as well as broken track diagnostics; it can be used as a "stand-alone" current sensor connected directly to a cable. It works by sensing the current by converting the magnetic field generated by currents flowing through a conductor to a voltage, proportional to the field.

The transfer characteristic of the MLX91206 is fully customer programmable (offset, gain, clamping levels and more). There is an option for output between analog and PWM. The linear analog output answers the need for a very fast response of

Packaging and availability: Two product versions are available for the device. The MLX91206CAL is ideal for a low magnetic field range of +/-10mT, whereas the MLX91206CAH is well suited for high magnetic field range of up to +/-25mT. The device is packaged in a SOIC8, RoHS compliant, lead-free package for SMD assembly, and is available for high volume production with engineering samples available upon request.

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