Infineon introduces high precision coreless current sensor Xensiv TLE4972 for automotive applications

From Infineon Technologies comes its first automotive current sensor, the Xensiv TLE4972. The coreless current sensor uses Infineon’s Hall technology for precise and stable current measurements. With its compact design and diagnosis modes, the TLE4972 suits xEV applications such as traction inverters used in hybrid and battery-driven vehicles, as well as battery main switches.

As a result of proprietary temperature and stress compensation, TLE4972 offers sensing without the negative effects caused by magnetic cores. Its differential sensing structure means neither core nor shield are required to protect the sensor against stray fields. The integrated EEPROM allows customisation of the sensor for different applications and supports measurement ranges up to 2 kA.

To protect the system, the sensor has two separate output pins for overcurrent detection with a typical response time of less than 1 microS. Customers can program the sensitivity as well as the overcurrent limits and adapt the sensor to the system requirements. In addition, the drift of sensitivity plus offset over temperature is below 1.6 per cent.

The sensor causes low power losses owing to the magnetic sensing principle. Therefore, it can be used as a solution in 400 V or 800 V battery main switches. The small PG-VSON-6 package enables a compact design, suiting the device to traction inverters. Moreover, a second product variant in a PG-TDSO-16 is offered. Both devices have been developed according to ISO 26262 as safety element out of context for safety requirements up to ASIL B.

Samples of the XENSIV TLE4972-AE35D5 (PG-TDSO-16) are available and the TLE4972-AE35S5 (PG-VSON-6) will be available in 2022. Mass production is planned to start in 2022. 

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