High-speed current sensor IC eases assembly

January 29, 2021 //By Jean-Pierre Joosting
High-speed current sensor IC eases assembly
Current sensor portfolio boosts accuracy, enhances stability and provides for a measurement range beyond 2000 A with fast response times.

Melexis has introduced the MLX91216 XHF extra high-field current sensor, extending the ease and accuracy of its unique IMC-Hall® technology into high-current measurement for emerging automotive applications.

Capable of measuring current to beyond 2000 A, the MLX91216 XHF is suited to redundant monitoring of battery-management systems (BMS), over-current detection in smart fuses, and measuring phase currents in traction inverters and boost/recuperation inverters. With user-programmable filtering to adjust resolution, response time, and bandwidth for optimum signal-to-noise ratio, the sensor features built-in diagnostics, including broken-wire detection.

The SOIC8 surface-mount device contains patented Integrated Magnetic Concentrator (IMC) technology from Melexis that enables accurate contact-free measurement of busbar current in combination with a simple U-shape magnetic shield. When mounted on a PCB, the sensor is positioned over the busbar, within the shield, allowing easier assembly than conventional Hall sensors.

What differentiates the proven IMC-Hall® technology from coreless solutions is that position is much less critical. The design can accept more mechanical movement because the measurement is not dependent on a magnetic field gradient. Other technologies that are can result in very severe bus bar machining causing important thermal hot spots. On the other hand, IMC-Hall® technology carries the advantages of coreless technologies, so it lends itself to smaller assemblies with surface mount packages. This avoids the use of more complex through-hole packages that often require specific lead bending/forming native to core based solutions.

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