INA253 is a new current meter with built-in shunt. Free Technical Library News

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INA253 - new current meter with integrated shunt

22.04.2019

The Texas Instruments INA253 current monitor is a dedicated amplifier with a built-in 2 mΩ shunt. The INA253 is designed to monitor bidirectional currents over a wide common mode range from -4V to +80V, independent of its own supply voltage.

The ICs are available in three fixed gains: 100mV/A, 200mV/A and 400mV/A. The integration of a precision resistor with a zero-drift chopped amplifier ensures precise measurement accuracy due to constant calibration. The INA253 has a minimum temperature drift of 15 ppm/°C and includes an optimized Kelvin circuit for connecting the measurement part to the shunt resistor.

The INA253 is designed to work in PWM controlled current circuits and includes special large (dv / dt) signal rejection to enable continuous real-time current measurements. Current measurements are critical in motor drive applications as well as solenoid valve control applications.

Features of INA253:

precision shunt: 2 mΩ, 3 nH, 0,1% (max);
measurement: +- 15 A;
temperature range: -40...85°C;
temperature coefficient from 0...125°C: 10 ppm/°C;
bandwidth: 350 kHz;
improved resistance to PWM;
excellent CMRR > 120 dB DC; 90 dB at 50 kHz;
accuracy parameters:
gain:
error: 0.4% (max);
drift: 45 ppm/°C (max);
bias:
bias current: +-15 mA (max);
drift: 125 µA/°C (max);
wide range of common-mode voltage: -4...+80 V;
transfer coefficient options: 100 mV/A, 200 mV/A and 400 mV/A;
own current consumption: 2,4 mA (max).

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