Figure 8-1 depicts a simplified block diagram of a solar inverter supporting a 1000-V_DC string voltage where the AMC1400 is used to monitor the current on the 1200-V DC link. The output current of the boost converter flows through a shunt resistor (RSHUNT) and produces a voltage drop that is sensed by the AMC1400. The AMC1400 outputs a differential analog voltage that is proportional to the input signal and galvanically isolated from the high-voltage side. The differential output voltage is typically routed to an analog-to-digital converter (ADC) of a microcontroller (MCU) to complete the current-sensing signal chain. The AMC1411 is used in the same application for measuring the DC link voltage. Both devices share a common high-side power supply based on the SN6501 push-pull driver and a transformer that supports the desired isolation voltage ratings.

The stretched SOIC package, differential input, differential output, and the high common-mode transient immunity (CMTI) of the AMC1400 ensure reliable and accurate operation in high-noise environments while meeting IEC standards for reinforced isolation at 1 kV and higher working voltages.