SBAS895B May 2018 – April 2020 AMC1300
Isolated amplifiers are widely used in frequency inverters, which are critical parts of industrial motor drives, photovoltaic inverters, uninterruptible power supplies, and other industrial applications. The input structure of the AMC1300 is optimized for use with low-value shunt resistors in current sensing applications.
Figure 51 depicts a typical operation of the AMC1300 for current sensing in a frequency inverter application. Phase current measurement is accomplished through the shunt resistors, RSHUNT (in this case, a two-pin shunt). The differential input and the high common-mode transient immunity of the AMC1300 ensure reliable and accurate operation even in high-noise environments (such as the power stage of the motor drive). The high-impedance input and wide input voltage range make the AMC1311 suitable for DC bus voltage sensing.