ACS724KMATR-65AB-T

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1. Describe

The Allegro™ ACS724KMATR-65AB-T current sensor IC is an economical and accurate solution for AC or DC current sensing in industrial, commercial and communication systems. The small package is ideal for space-constrained applications, while providing cost savings due to reduced board area. Typical applications include motor control, load detection and management, switch mode power supplies, and overcurrent fault protection. The device consists of an accurate, low-offset, linear Hall sensor circuit with copper conduction paths located near the surface of the chip. An applied current flowing through this copper conduction path creates a magnetic field that is sensed by the integrated Hall IC and converted to a proportional voltage. Currents are sensed differentially to reject common-mode fields, improving accuracy in magnetically noisy environments. Inherent device accuracy is optimized by the close proximity of the magnetic field to the Hall sensor. The low-offset, chopper-stabilized BiCMOS Hall ICs provide precise ratiometric voltages and include Allegro's patented digital temperature compensation for extremely accurate performance over temperature. The output of the device has a positive slope as the current increases through the primary copper conduction path, which is the path used for current sensing. The internal resistance of this conductive path is 0.85 mΩ Typically, low power losses are provided. The terminals of the conductive path are electrically isolated from the sensor leads. This allows the ACS724KMATR-65AB-T current sensor IC to be used in high-side current sensing applications without the need for high-side differential amplifiers or other expensive isolation techniques.

2. Feature

    1. Differential Hall sensing rejects common mode fields

    2. Patented integrated digital temperature compensation circuit for closed-loop temperature accuracy in open-loop sensors

    3. UL60950-1 (ed. 2) certified

        - Dielectric Strength Voltage = 4.8 kVRMS

        - Basic isolated working voltage = 1097 VRMS 

        - Reinforced isolation working voltage = 565 VRMS

    4. Industry-leading noise performance with greatly increased bandwidth through proprietary amplifier and filter design techniques

    5. The filter pin allows the user to filter the output to improve resolution at lower bandwidths

    6. 0.85 mΩ primary conductor resistance for low power loss and high surge current tolerance

    7. Thin SOIC16 package for space-constrained applications

    8. 4.5 to 5.5 V Single Supply Operation

    9. The output voltage is proportional to the AC or DC current

3. Pin configuration

4. Pin Description

5. Thermal Rise vs Primary Current

Current-induced self-heating should be considered during the design of any current-sensing system. Sensors, printed circuit boards (PCBs), and PCB contacts generate heat when current flows through the system. Thermal response is highly dependent on PCB layout, copper thickness, cooling techniques and injection current distribution. The current curve includes peak current, current "on time" and duty cycle. Although the data presented in this section was collected using direct current (DC), these numbers can be used to approximate the thermal response of AC signals and current pulses.