By Majeed Ahmad, contributing writer
A new family of current sensors from Infineon Technologies comprising precise and stable coreless Hall sensors allows designers to program parameters such as current range, overcurrent threshold, and output mode. Unveiled at PCIM Europe 2019, the XENSIV TLI4971 , the first member of this family, covers measurement ranges from ±25 A to ±120 A and addresses industrial applications like electric drives up to 50 kW and photovoltaic inverters.
The coreless open-loop current sensor offers an accurate and stable current measurement that is presented as an analog output voltage. Differential measurement using two Hall cells ensures high accuracy even in a noisy environment with crosstalk from adjacent current lines or magnetic stray fields.
The TLI4971 employs temperature and stress compensation to ensure that sensitivity error is as low as 2% at room temperature. Infineon said that the sensitivity error can be reduced below 2% with a single point in-system calibration.
The current sensor, which has two output pins for fast overcurrent signals, enables designers to program threshold levels of the overcurrent signals and thus adopt them to system requirements without requiring further external components, so signals can be used for pre-warning and system shutdown. The current sensor also provides a signal in case of an over- or undervoltage condition for the supply voltage.
The TLI4971 will be launched in September 2019. Samples will be available in August. Other members of the product family will follow in 2020 along with qualification for automotive applications.
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