Infineon Technologies has announced it has expanded its XENSIV sensor portfolio with the TLE4978 family of coreless, isolated magnetic current sensors that combine ultra-low noise with high bandwidth and accuracy.

The company says the new sensors enable more efficient and reliable power conversion in applications ranging from electric vehicle charging to AI data centres.
 
As artificial intelligence transforms computing infrastructure and electric mobility reshapes transportation, power systems face unprecedented demands for efficiency, speed, and precision. Modern silicon carbide (SiC) and gallium nitride (GaN) power platforms switch at ever-higher frequencies, requiring current sensing solutions that deliver both speed and accuracy without compromise.
 
Infineon says the TLE4978 addresses this challenge through a patented hybrid Hall and coil design. The architecture integrates differential Hall sensing elements with monolithic differential air coils similar to a Rogowski coil in a single die. Hall elements detect magnetic fields created by electric current at lower frequencies (DC to a few kHz), while the coil elements respond rapidly to changing currents, delivering high bandwidth. This innovative approach delivers 9 MHz bandwidth with 38 mA rms noise and high accuracy characterised by ±1.2% sensitivity error and ±200 mA offset error over temperature and lifetime (-40°C to 150°C).
 
The company says the device's 9 MHz bandwidth supports fast switching currents in next-generation SiC and GaN platforms. Proprietary shielding techniques provide robust common-mode transient immunity (CMTI), ensuring reliable operation in electrically noisy environments. The sensor offers calibration-free operation, simplifying system integration and reducing time to market.

Advanced protection features include fast overcurrent detection (OCD) with 100 ns response time. OCD thresholds can be configured via the digital configuration and diagnostic interface (DCDI) or an external resistive divider. The TLE4978 is said to be the first coreless magnetic current sensor to offer integrated zero crossing detection (ZCD), simplifying control loop implementation. The die is housed in an industry-standard DSO-16 300 mil package with reinforced and basic isolation, 8 mm clearance, and creepage. Low current rail resistance of 550 µΩ enables measurements up to 60 A nominal current. With ISO 26262 capability up to ASIL-B and AEC-Q100 Grade 0 qualification, the device meets stringent automotive requirements.
 
The company says the TLE4978 addresses critical needs across multiple high-growth segments. In automotive applications, the sensor supports on-board chargers and high-voltage DC-DC converters that enable faster charging and extended range. In renewable energy systems, it enhances photovoltaic (PV) inverter efficiency and reliability. For AI data centres, where power demands are growing exponentially, the combination of high bandwidth and robust CMTI makes the TLE4978 ideal for next-generation power supply units (PSUs). Precise current sensing enables advanced power management strategies that maximise energy efficiency while ensuring system protection. As data centres scale to meet AI workloads, every percentage point of efficiency improvement translates to significant cost savings and reduced environmental impact.
 
The TLE4978 is optimised for use with Infineon’s broad AI server power delivery portfolio from grid to core – spanning solid-state transformers and circuit breakers, high-voltage and intermediate bus conversion, as well as second-stage DC conversion power modules. Leveraging the benefits of silicon (Si), silicon carbide (SiC), and gallium nitride (GaN) to achieve the highest efficiency, density, and robustness, Infineon says it gives customers a clear path to end-to-end power architectures with proven high-quality components, consistent design support, and scalable performance for next-generation AI server platforms.
 

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