IC ACS730 can be worthwhile in the fields of motor control, load detection and management, switched-mode power supplies and overcurrent fault protection
Allegro MicroSystems, LLC has announced the 1 MHz bandwidth Hall-effect current sensor IC with a lightning-fast 210 ns response time. The ACS730 provides an economical solution for AC or DC current sensing and is targeted at industrial, commercial and communication systems.
The device consists of a low-offset, linear Hall sensor circuit with a copper conduction path located near the surface of the die. It is provided in a small, low-profile surface-mount SOIC-8 package. The lead frame is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes. Internally, the device is Pb-free, except for flip-chip high-temperature Pb-based solder balls, currently exempt from RoHS.
Working behind ACS730
Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and convert it into a proportional voltage. Device accuracy is optimised through the close proximity of the magnetic field to the Hall transducer. A proportional voltage is provided by the Hall IC which is programmed for accuracy after packaging.
The output of the device has a positive slope when an increasing current flows through the primary copper conduction path (from pins 1 and 2 to pins 3 and 4), the path used for current sensing. The internal resistance of this conductive path is typically 1.2 mΩ, providing low power loss.
The terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS730 current sensor IC to be used in high-side current sense applications without the use of high-side differential amplifiers or other costly isolation techniques.