Hall-effect current sensor boost for integrated HV shunt
Texas Instruments (TI) has launched a range of Hall-effect current sensors for more accurate integrated shunt designs.
The TMCS1123 Hall-effect current sensor from TI offers design simplicity and accuracy for high-voltage systems, featuring the industry’s highest reinforced isolation and highest accuracy over lifetime and temperature.
For nonisolated systems up to 85 V and 75 ARMS, TI’s new EZShunt range includes the industry’s smallest fully integrated current shunt monitor and the industry’s highest-accuracy 75-A integrated shunt design.
The need for highly accurate current measurements in high-voltage systems such as electric vehicle chargers and solar inverters is growing, but Hall-effect current sensors have typically been overlooked given their high drift over lifetime.
The current sensors simplify designs by removing the need for an external shunt resistor and the portfolio provides a fully integrated current-sensing solution that fits within the footprint of a 1206 shunt resistor, offering the value of a discrete solution with the simplicity of a single chip.
The TMCS1123 Hall-effect current sensor features the highest reinforced isolation working voltage of 1,100 VDC with a maximum sensitivity error of ±0.75% with 50 ppm/°C drift over temperature and ±0.5% drift over lifetime. The high precision and stability over lifetime remove the need to recalibrate equipment, reducing costly and time-consuming maintenance.
In addition, achieving precise control of power conversion is paramount for optimizing system efficiency and protection. The TMCS1123 features low propagation delay of 600 ns and bandwidth of 250 kHz, which enable faster control loops while keeping noise low to help increase system efficiency.
Higher bandwidth and automotive-qualified versions of the TMCS1123 are expected to be available in fourth quarter of 2023 and second quarter of 2024, respectively.
The EZShunt portfolio offers both cost-optimized and high-accuracy options, featuring drift down to 25 ppm/°C in a variety of packages and shunt values. The INA700 is 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, the industry’s highest-accuracy 75-A integrated shunt solution, which supports common-mode voltages up to 85 V.
“When choosing a current-sensing solution, design engineers weigh the trade-offs of four key factors: cost, size, accuracy and speed,” said Jason Cole, business unit manager. “These new products highlight how the breadth of our sensing technologies address this design challenge for a variety of systems. Take the TMCS1123, for example; its high accuracy and low propagation delay enable 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.”
Preproduction quantities of the TMCS1123 Hall-effect current sensor are available now, only on TI.com, in a 10.3-mm-by-10.3-mm, 10-pin small outline integrated circuit (SOIC) package. Pricing starts at US$2.37 in 1,000-unit quantities. Designers can purchase the TMCS1123EVM for US$49.99.
Preproduction quantities of EZShunt products are available now, only on TI.com, in a variety of package options as small as 1.319-mm x 1.239-mm. Pricing starts at US$0.80. Designers can purchase evaluation modules starting at US$49.99.
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