Closed-loop current sensors achieve offset drift down to 3ppm/°C

11th October 2019
Anna Flockett

The latest closed-loop Hall effect current sensors deliver the added performance of fluxgate sensors without the added cost.  LEM have recently launched six separate families of LxSR sensors called LXS, LXSR, LES, LESR, LKSR, LPSR.

Based on LEM’s custom proprietary Hall-effect ASIC, the LxSR series sensors offer low offset drift of 3 to 14ppm/°C, combined with high levels of design flexibility. All families provide options for an integrated voltage reference, an aperture and/or integrated primary conductors and fast over-current detection. Designed for nominal currents from 1.5 to 50 A, the LxSR series operates over a temperature range from -40 to +105°C.

The families achieve LEM’s benchmark performance through a patented arrangement of multiple Hall cells in addition to sophisticated offset cancelling techniques. Each sensor is individually calibrated and sensitivity adjustments are stored in the ASIC’s One-Time-Programmable memory. This memory is also used to store a unique ID to provide full traceability of each ASIC.

LEM’s next-generation LxSR current sensors are available now for sampling and production.

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