Infineon — XENSIV™ TLI4971 Series of Magnetic Current Sensors

The XENSIV™ TLI4971 series from Infineon Technologies are precise and stable coreless magnetic current sensors.

Infineon supplies the TLI4971 series in eight derivatives with a current-measurement range of 25A, 50A, 75A, or 120A in standard or UL-recognized versions.

The coreless, open-loop sensor architecture gives the TLI4971 the advantages of both high measurement performance and small size. The sensor’s analog measurement outputs are

accurate and stable thanks to proven temperature and stress compensation implemented in the chip: sensitivity error is as low as 3% at room temperature, and can be reduced to less than 3% with a single-point, in-system calibration.

The sensor adopts a differential measurement principle based on the outputs from two Hall magnetic cells. This ensures high accuracy even when used in a noisy environment which generates cross-talk from adjacent power lines or magnetic stray fields.

The coreless architecture adopted by the TLI4971 enables Infineon to house the chip in a small 8mm x 8mm x 1mm QFN package. In addition, the layout of the current rail provides best-in-class thermal performance when measuring currents up to 120A.

The TLI4971 has two Output pins for fast over-current signals of <1.5µs. Users can program the threshold and delay time of the over-current signals without the need for external components. The signals can be used for pre-warning and system shut-down.

Another feature of the current sensor is the option to select between three output modes – single-ended, semi-differential and full differential mode – increasing the flexibility to adapt to application-specific requirements.