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Power Electronics Europe News
Hall-effect current sensor has industry’s lowest drift, says TI
They include an isolated Hall-effect current sensor for high-voltage systems which is claimed to have the lowest drift. There are also current shunt monitors that eliminate the need for an external shunt resistor for non- isolated voltage rails.

The TMCS1123 Hall-effect current sensor has the industry’s highest reinforced isolation and highest accuracy over lifetime and temperature, said TI. For non-isolated systems up to 85V and 75A RMS, TI also offers what it claims is the industry’s smallest fully integrated current shunt monitor and the industry’s highest accuracy 75A integrated shunt device.

According to Jason Cole, business unit manager at TI, the sensors and monitors support engineers in the trade offs required of cost, size, accuracy and speed. He says the TMCS1123’s accuracy and low propagation delay enables designers to now use Hall-effect sensors in high voltage systems “where they couldn’t before – and that opens the door to reduce system cost and size”.

Typical applications for accurate current measurements in high voltage systems include electric vehicle chargers and solar inverters but Hall-effect current sensors have typically been overlooked given their high drift over lifetime. The TMCS1123 Hall-effect current sensor features a reinforced isolation working voltage of 1,100V DC and a maximum sensitivity error of ±0.75% with 50ppm/°C drift over temperature and ±0.5% drift over lifetime. The levels of precision and stability remove the need to recalibrate equipment, reducing costly and time-consuming maintenance, adds TI.

A propagation delay of 600ns and bandwidth of 250kHz contribute to precise control of power conversion with faster control loops while keeping noise low for system efficiency.

The EZShunt portfolio of current sensing solutions simplifies designs by removing the need for an external shunt resistor. It includes a fully integrated current sensing solution that fits within the footprint of a 1206 shunt resistor. The result, says TI is the value of a discrete solution with the simplicity of a single chip.

Both cost-optimised and high accuracy options are available, featuring drift as low as 25ppm/°C, in a variety of packages and shunt values. The INA700 is claimed to be the industry’s smallest integrated current shunt monitor, enabling engineers to reduce the size of their current-sensing solution by as much as 84%. The portfolio also includes the INA781, believed to be the industry’s highest accuracy 75A integrated shunt solution, which supports common mode voltages up to 85 V.

Pre-production quantities of the TMCS1123 Hall-effect current sensor are available now, in a 10.3 x 10.3mm, 10-pin SOIC package. There is also the TMCS1123EVM. Higher bandwidth and automotive-qualified versions of the TMCS1123 are expected to be available in Q4 2023 and Q2 2024, respectively.

Preproduction quantities of EZShunt products are available now in a variety of package options as small as 1.319 x 1.239mm. Evaluation modules are also available. Analogue and automotive versions are expected to be available in Q2 2024.

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