An accurate current monitor circuit diagram that operates from a positive high common-mode DC voltage of up to +500 V with an error of less than 0.2%. The load current is passed through a shunt resistor external to the circuit. The shunt resistor value should be chosen so that the shunt voltage is approximately 500 mV at maximum load current.
When used with an external PNP transistor, the AD8212 can accurately amplify small differential input voltages with a positive high common-mode voltage greater than 500 V. Galvanic isolation is provided by the four-channel isolator ADuM5402. This is not only to provide protection, but also to isolate downstream circuits from high common-mode voltages. In addition to isolating the output data, the digital isolator ADuM5402 provides +3.3 V isolated power to the circuit. The measurement results of the AD7171 are provided in digital form via a simple two-wire SPI-compatible serial interface. This device combination enables an accurate positive high voltage rail current sensing solution with low component count, low cost, and low power consumption. 
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