Precision reinforced isolated amplifier provides high immunity to magnetic interference

The Texas Instruments AMC1302 is a precision isolated amplifier with a capacitive isolation barrier that provides high immunity to magnetic interference. This barrier gives reinforced isolation of 5kVRMS (max) with a long lifetime and low power dissipation. This device isolates components that operate on different common-mode voltage levels when used with isolated power supplies. Moreover, the device also protects lower-voltage devices from damage. The input of the device is optimised for direct connection to shunt resistors or other low voltage-level signal sources. The ±50mV input voltage range enables a notable reduction of the power dissipation through the shunt. Also, the low high-side supply current and voltage of the device enable the use of low-cost isolated power-supply solutions. The performance of the amplifier maintains accurate current control resulting in system-level power savings and low torque ripple that is especially important in motor control applications. The integrated input common-mode overvoltage and missing high-side supply voltage detection features of the device simplify system-level diagnostics.