Description

This verified reference design implements isolated current sensing data acqusition based on AMC1304M25 isolated delta-sigma (ΔΣ) modulator and TMS320F28377D microcontroller. This design was made for shunt-based current measurement applications which require excellent galvanic isolation and accuracy: such as industrial motor drives: photovoltaic inverters and energy metering.  It is capable of measuring load currents from -10 A to +10 A with better than 0.3% uncalibrated accuracy: and it also provides dual functionality of a high resolution channel and an additional over-current or short-circuit detection channel.  Design functionality and performance were verified against the circuit design goals by fabricating three PCBs and measuring results for DC and AC input signals.