How susceptible is the ACS750 to stray magnetic fields?
The ACS750 contains a ferrite core that acts not only as a concentrator of the flux lines generated by Iprimary, but also as a shield to protect the sensor IC from ambient common-mode fields (typical rejection of common mode fields is -32 dB). The results are detailed in the following chart, which compares the output voltages, Vout, of an unshielded linear Hall effect sensor IC with that of the ACS750. The devices have the same gain, and are exposed to the same magnetic field, applied in an air core through the top of the package.
