Application note for MLX91220 - External Field Immunity

The MLX91220 is an Integrated Current Sensor that senses the current flowing through the leadframe of the SOIC package. By virtue of fixing the current conductor position with respect to the monolithic CMOS sensor, a fully integrated Hall-effect current sensor is obtained, that is factory calibrated.

Inside the package, the magnetic flux density generated by the current flow is sensed differentially by two sets of Hall plates. As a result, the influence of external disturbing fields originating from the dense power electronics surrounding the IC is minimized in the fast analog front-end.

It is still important to understand the effects of an external disturbing field in order to optimize the design of the application. This application note focus on the external field created by current paths surrounding the IC.

Application note for MLX91220 - External Field Immunity