Melexis has introduced the MLX91224 and MLX91225 isolated current sensors for high-voltage automotive and industrial applications. The devices provide current measurement up to 100 A RMS and are designed for applications, including electric vehicle (EV) powertrains, dc-dc converters, and ac and dc chargers.
The sensors integrate the current conductor, sensing element, signal conditioning, and isolation within a compact SOIC package. Current flows through the package’s low-impedance lead frame, while differential Hall plates measure the resulting magnetic flux.
The differential sensing architecture is designed to reduce the influence of external magnetic fields and provides a linear analog output proportional to the measured current. Depending on the package, the devices support working voltages up to 1,640 V RMS.
For automotive applications, the MLX91224 and MLX91225 are developed as ISO 26262 Safety Elements out of Context and provide ASIL B readiness for safety-related current measurement in high-voltage systems.
The devices are available in three package configurations to accommodate different current and isolation requirements. The DE and DG versions support continuous current measurement up to 50 A RMS, while the DH package extends continuous operation to 100 A RMS and supports surge currents up to ±29 kA.
Both devices support ac and dc current measurement as well as bipolar and unipolar sensing. The MLX91224 operates with 5-V systems, while the MLX91225 supports 3.3-V systems, allowing integration with different microcontroller and power architectures.
A dedicated overcurrent-detection output provides additional protection and monitoring capability, with thresholds that can be configured internally or externally. The sensors operate across an ambient temperature range of -40 to 150 °C.
The MLX91224 and MLX91225 are intended for automotive and power-conversion applications where isolated current measurement is required, including electric drives, charging systems, and dc-dc converters.
Filed Under: Sensors, Technology News