TI's New Current Sensing Solutions Increase Accuracy and Integration
Texas Instruments (TI) has introduced new current sensing solutions that aim to offer higher accuracy and improved integration, while also simplifying designs. The latest offerings from TI include a Hall-effect current sensor and a range of current shunt monitors with built-in shunt resistors.
The TMCS1123 is TI's flagship release, a Hall-effect current sensor that boasts galvanic isolation of up to 5,000 Vrms and a continuous current capability of 75 Arms. Specifically designed for high-power applications such as solar inverters and industrial AC/DC converters, the TMCS1123 offers exceptional accuracy. It achieves this through a built-in drift compensation feature, which ensures less than 1.75% maximum total error over temperature and lifetime without requiring calibration. With a one-time room calibration, the error can be reduced to below 1%. The sensor also offers a reinforced isolation working voltage of 1,100 VDC, the highest in its class.
In addition to its accuracy, the TMCS1123 provides minimal noise and supports faster control loops with its 600 ns propagation delay and 250 kHz bandwidth. The device is available with varying sensitivities ranging from 25 mV/A to 150 mV/A and supports both bidirectional and unidirectional current sensing. TI plans to have these devices certified with safety standards such as UL 1577 and IEC/CB 62368-1.
TI's other release is the EZShunt technology portfolio, which integrates the shunt resistor into the current sensing solutions. By eliminating the need for external components, the EZShunt products simplify designs and reduce the bill of materials. The portfolio includes the INA700, the smallest fully-integrated current shunt monitor, and the INA781, which offers the highest accuracy for a 75-A integrated shunt solution. The INA700 reduces the size of sensing solutions by 84% compared to non-integrated options and is suitable for lighter applications like smartphones and notebook computers. The INA781, on the other hand, provides an accuracy of ±2.5°C over the junction temperature range and is ideal for industrial-facing applications such as power delivery, grid infrastructure, and enterprise servers.
With these new current sensing solutions, TI aims to provide designers with more options to integrate current sensing into their designs. By enhancing accuracy, reducing propagation delay, and optimizing footprint size, TI hopes to enable the use of Hall-effect sensors and current sensors in a wider range of high-voltage systems. The TMCS1123 and EZShunt solutions, along with the TMCS1123EVM evaluation board, are currently available in pre-production quantities from TI.
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