Datasheet ACS724KMA (Allegro)

ACS724KMA High-Accuracy, Hall-Effect-Based Current Sensor IC with Common-Mode Field Rejection in High-Isolation SOIC16 Package FEATURES AND BENEFITS DESCRIPTION
• Differential Hall sensing rejects common-mode fields The Allegro™ ACS724KMA current sensor IC is an economical • Patented integrated digital temperature compensation and precise solution for AC or DC current sensing in industrial, circuitry allows for near closed loop accuracy over commercial, and communication systems. The small package temperature in an open loop sensor is ideal for space-constrained applications while also saving • UL60950-1 (ed. 2) certified costs due to reduced board area. Typical applications include □ Dielectric Strength Voltage = 4.8 kVRMS motor control, load detection and management, switched-mode □ Basic Isolation Working Voltage = 1097 VRMS power supplies, and overcurrent fault protection. □ Reinforced Isolation Working Voltage = 565 VRMS The device consists of a precise, low-offset, linear Hall • Industry-leading noise performance with greatly sensor circuit with a copper conduction path located near the improved bandwidth through proprietary amplifier and surface of the die. Applied current flowing through this copper filter design techniques conduction path generates a magnetic field which is sensed • Filter pin allows user to filter output for improved by the integrated Hall IC and converted into a proportional resolution at lower bandwidth voltage. The current is sensed differentially in order to reject • 0.85 mΩ primary conductor resistance for low power common-mode fields, improving accuracy in magnetically loss and high inrush current withstand capability noisy environments. The inherent device accuracy is optimized • Low-profile SOIC16 package suitable for space- through the close proximity of the magnetic field to the Hall constrained applications transducer. A precise, proportional voltage is provided by the • 4.5 to 5.5 V single supply operation low-offset, chopper-stabilized BiCMOS Hal IC, which includes • Output voltage proportional to AC or DC current Allegro’s patented digital temperature compensation, resulting Continued on the next page… 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 TÜV America Certificate Number: 1 through 4, to pins 5 through 8), which is the path used for U8V 16 03 54214 040 CB Certificate Number: CB 16 03 54214 039 current sensing. The internal resistance of this conductive path US-32210-M1-UL is 0.85 mΩ typical, providing low power loss. The terminals of the conductive path are electrically isolated
PACKAGE: 16-pin SOICW (suffix MA)
from the sensor leads (pins 9 through 16). This allows the ACS724KMA 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. Continued on the next page… Not to scale 16 1 ACS724KMA NC
The ACS724KMA outputs
2 IP+ 15
an analog signal, V
+I GND
IOUT , that
P 3 IP+
changes proportionally with
IP+ 14
the bidirectional AC or DC
4 NC IP+
primary sensed current, IP ,
FILTER 13
within the specified measure-
I
ment range.
P 12 VIOUT C 5 F IP– 11 C 1 nF
The FILTER pin can be used
6 L NC
to decrease the bandwidth in
–IP 7 IP– 10
order to optimize the noise
IP– VCC 8
performance.
C IP– 9 BYPASS NC 0.1 µF
Typical Application
ACS724KMA-DS, Rev. 11 June 3, 2019 MCO-0000217