TIDA-00445, Shunt-Based 200A Peak Current Measurement Reference Design Using Isolation Amplifier

TIDA-00445, Shunt-Based 200A Peak Current Measurement Reference Design Using Isolation Amplifier. The TIDA-00445 design provides a reference solution for isolated current measurement using shunt and isolated amplifier. By limiting the shunt voltage to 25mV, this design is able to reduce power dissipation in the shunt and achieves a high current measurement range of up to 200A. Shunt voltage is further amplified by precision Op-Amps in instrumentation amplifier based configuration with a gain of 10 to match the input range of isolation amplifier. The output of isolation amplifier is level shifted and scaled to utilize the complete input range of 3.3v ADC. This design uses free running transformer driver for generating isolated supply voltage for the high voltage side of the circuit