Monolithic isolated current sensor lowers design complexity : Page 2 of 2

December 08, 2020 //By Christoph Hammerschmidt
Monolithic isolated current sensor lowers design complexity
Microelectronics engineering company Melexis (Tessenderlo, Belgium) has introduced the second-generation of isolated integrated current sensors MLX91220 (5 V) and MLX91221 (3.3 V). The Hall-effect based current sensors are qualified for use in a range of automotive and industrial applications, such as on-board chargers (OBC), DC/DC converters, power supplies, and small electric drives.

Unlike most current sensors, the MLX91220/21 does not rely on ferromagnetic concentrators. Instead, it uses an internal differential sensing concept to detect the magnetic field that is generated by the integrated primary conductor. This differential concept also provides a high level of stray field immunity, enabling higher density power electronics, as the sensor is less affected by stray magnetic fields in close proximity.  

The SOIC8 package is rated to 2.4 kVrms isolation as per IEC/UL-62368, and the SOIC16 wide body package doubles this to 4.8 kV rated isolation. The SOIC16 package also offers a lower primary conductor resistance, thanks to its higher pin count and increased conductor thickness. Both variants distinguish themselves from discrete shunt solutions by having lower resistivity, the SOIC16 scores 0.75 mOhm, while the SOIC8 measures 0.85 mOhm; significantly lower than shunt-based solutions. 

The comprehensive feature integration and design flexibility offered by the MLX91220 and MLX91221 provide customers with a competitive advantage when looking to optimize performance using just one product. To help customers simplify design and benefit from new features, Melexis is continuously developing new technologies to enhance its existing current sensor offering. 

More information: https://www.melexis.com/

 


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