Programmable Coreless Hall Sensors Measure ±25A to ±120A
Infineon Technologies AG will launch a new family of current sensors and is presenting its first member of this new family at this year's PCIM trade fair.
The family will consist of precise and stable coreless Hall sensors. Infineon says that the Hall sensors offer a high level of flexibility because they allow customers to individually program product parameters such as the current range, the output mode, and the over-current threshold.
The first product, XENSIV™ TLI4971, covers measurement ranges from ±25A to ±120A. It addresses industrial applications including photovoltaic inverters or electric drives up to 50kW. Additional members of the product family to follow in 2020 will be qualified for automotive applications.
The coreless open loop current sensors offer an accurate and stable current measurement--provided as an analog output voltage.
Based on Infineon's temperature and stress compensation the sensitivity error is as low as 2% at room temperature. The sensitivity can be reduced below 2% with a single point in-system calibration. Furthermore, differential measurement with two Hall cells ensures high accuracy even in a noisy environment with cross-talk from adjacent current lines or magnetic stray fields.
The TLI4971 features two output pins for fast overcurrent signals. Threshold levels of the over-current signals are programmable and thus they can meet system requirements without the need of further external components. The signals can be used for pre-warning and system shut-down. In addition, the device also offers a signal in case of an over- or under-voltage condition for the supply voltage.
Due to the coreless concept, the TLI4971 fits into an 8mm x 8mm x 1mm leadless QFN type package (TISON-8). The layout of the current rail provides give the current sensor what the company describes as best in class thermal performance for currents up to 120A, at no extra cost.
The device is intended for use in high voltage applications and incorporates galvanic isolation up to 1.1kV (maximum repetitive isolation voltage VIORM).
The XENSIV TLI4971 will be launched in September 2019. Samples will be made available in August.
Infineon at the PCIM 2019
At the PCIM 2019, Infineon will present and demonstrate the company's product-to-system solutions. The demos are to be shown at booth #313 in hall 9 (Nuremberg, Germany, 7-9 May 2019).