DESCRIPTION
The Allegro™ ACS723 current sensor IC is an economical and precise solution for AC or DC current sensing in industrial, commercial, and communications systems. The small package is ideal for space constrained applications while also saving costs due to reduced board area. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection.
The device consists of a precise, low-offset, linear Hall sensor circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic field to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which includes Allegro’s patented digital temperature compensation, resulting in extremely accurate performance over temperature. 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), which is the path used for current sensing. The internal resistance of this conductive path is 0.65 mΩ typical, providing low power loss.
The terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS723 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.
FEATURES AND BENEFITS
• Patented integrated digital temperature compensation circuitry allows for near closed loop accuracy over temperature in an        open loop sensor
• UL60950-1 (ed. 2) certified
□ Dielectric Strength Voltage = 2.4 kVrms
□ Basic Isolation Working Voltage = 420 Vpk/ 297 Vrms
• Industry-leading noise performance with greatly improved bandwidth through proprietary amplifier and filter design techniques
• Pin-selectable bandwidth: 80 kHz for high bandwidth applications or 20 kHz for low-noise performance
• 0.65 mΩ primary conductor resistance for low power loss and high inrush current withstand capability
• Small footprint, low-profile SOIC8 package suitable for space-constrained applications
• Integrated shield virtually eliminates capacitive coupling from current conductor to die, greatly suppressing output noise due to    high dv/dt transients
• 4.5 to 5.5 V, single supply operation
• Output voltage proportional to AC or DC current
• Factory-trimmed sensitivity and quiescent output voltage for improved accuracy