Hall-effect current sensor offers high accuracy and excellent linearity

27-07-2020 | Texas Instruments | Test & Measurement

Texas Instruments TMCS1100 Hall-Effect Current Sensor is a galvanically isolated Hall-effect current sensor capable of DC or AC current measurement at high accuracy, with excellent linearity and temperature stability. A low-drift, temperature-compensated signal chain offers <1% full-scale error over the device temperature range. The input current flows through an internal 1.8mOhm conductor that produces a magnetic field measured by an integrated Hall-effect sensor. This structure removes external concentrators and simplifies design. Low conductor resistance reduces power loss and thermal dissipation. Inherent galvanic insulation gives a 600V lifetime working voltage and 3kVRMS basic isolation in the current path and circuitry. An integrated electrical shielding allows excellent common-mode rejection and transient immunity.

The output voltage is proportionate to the input current with four sensitivity options. Fixed sensitivity enables the device to function from a single 3V to 5.5V power supply, removes ratiometry errors, and enhances supply noise rejection. The current polarity is deemed positive when flowing into the positive input pin. The VREF input pin offers a variable zero-current output voltage, allowing bidirectional or unidirectional current sensing. The device draws a maximum supply current of 6mA, and all sensitivity options are specified over an operating temperature range of -40C to +125C.

Typical applications include motor and load control, inverter and H-bridge current measurements, power factor correction, overcurrent protection, and DC and AC power monitoring.

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