Texas Instruments introduced a new current sense amplifier for in-line motor phase current measurement that improves overall motor efficiency. The INA240 offers enhanced pulse width modulation (PWM) rejection for systems running at up to 80 V to support a variety of applications such as motor control, solenoid control and power delivery systems.
The presence of high-speed in-line PWM motor control systems requires high AC and DC accuracy. The INA240’s enhanced PWM rejection improves transient suppression and gives designers the ability to reduce their blanking time, optimise the motor control algorithm and ultimately improve motor efficiency.
The chip operates at PWM rates in excess of 100 kHz, with switching-edge rates as high as 10 V/ns while enabling system voltages as high as 80 V. In addition, to address the needs for a wide range of systems, it supports the negative voltages (-4 V) induced by the inductive kickback of the motor.
The INA240 exhibits low offset voltage (5 μV), offset drift (50 nV/°C), gain error and drift performance (0,05% and 0,5 ppm/°C, respectively). The device also provides an excellent AC common-mode rejection ratio (CMRR) of 93 dB at 50 kHz.
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