SBOS820A September 2019 – June 2020 TMCS1100
The TMCS1100 is a precision Hall-effect current sensor, featuring a 600-V basic isolation working voltage, < 1% full-scale error across temperature, and an external reference voltage enabling unidirectional or bidirectional current sensing. Input current flows through a conductor between the isolated input current pins. The conductor has a 1.8-mΩ resistance at room temperature for low power dissipation and a 20-A RMS continuous current handling capability up to 105°C ambient temperature on the TMCS1100EVM. The low-ohmic leadframe path reduces power dissipation compared to alternative current measurement methodologies, and does not require any external passive components, isolated supplies, or control signals on the high-voltage side. The magnetic field generated by the input current is sensed by a Hall sensor and amplified by a precision signal chain. The device can be used for both ac and dc current measurements and has a bandwidth of 80 kHz. There are multiple fixed-sensitivity device variants for a wide option of linear sensing ranges, and the TMCS1100 can operate with a low voltage supply from 3 V to 5.5 V. The TMCS1100 is optimized for high accuracy and temperature stability, with both offset and sensitivity compensated across the entire operating temperature range.