ACS724LMC中文资料High Accuracy Hall-Effect-Based Current Sensor with 265 µΩ Integrated Conductor数据手册Allegro规格书

描述 Description

The Allegro ACS724 current sensor IC is an economical andprecise solution for AC or DC current sensing in industrial,automotive, commercial, and communications systems. Thesmall package is ideal for space-constrained applicationswhile also saving costs due to reduced board area. Typicalapplications include motor control, load detection andmanagement, switched-mode power supplies, and overcurrentfault protection.

The device consists of a precise, low-offset, linear Hallsensor circuit with a copper conduction path located near thesurface of the die. Applied current flowing through this copperconduction path generates a magnetic field which is sensedby the integrated Hall IC and converted into a proportionalvoltage. The current is sensed differentially in order to rejectcommon-mode fields, improving accuracy in magneticallynoisy environments. The inherent device accuracy is optimizedthrough the close proximity of the magnetic field to the Halltransducer. A precise, proportional voltage is provided by thelow-offset, chopper-stabilized BiCMOS Hall IC, which isprogrammed for accuracy after packaging. The output of thedevice has a positive slope when an increasing current flowsthrough the primary copper conduction path (from pins 1 and2, to pins 3 and 4), which is the path used for current sensing.The internal resistance of this conductive path is 1.2 mΩ typical,providing low power loss.

The terminals of the conductive path are electrically isolatedfrom the sensor leads (pins 5 through 8). This allows theACS724 current sensor IC to be used in high-side current senseapplications without the use of high-side differential amplifiersor other costly isolation techniques.

The ACS724 is provided in a small, low-profile surface-mount SOIC8package. The leadframe is plated with 100% matte tin, which iscompatible with standard lead (Pb) free printed circuit board assemblyprocesses. Internally, the device is Pb-free, except for flip-chip high-temperaturePb-based solder balls, currently exempt from RoHS.The device is fully calibrated prior to shipment from the factory.

特性 Features

• AEC-Q100 qualified 
• Differential Hall sensing rejects common-mode fields
• 1.2 mΩ primary conductor resistance for low power loss and high inrush current withstand capability
• Integrated shield virtually eliminates capacitive coupling from current conductor to die, greatly suppressing output noise due to high dv/dt transients
• Industry-leading noise performance with greatly improved bandwidth through proprietary amplifier and filter design techniques
• High-bandwidth 120 kHz analog output for faster response times in control applications
• Filter pin allows user to filter the output for improved resolution at lower bandwidth
• Patented integrated digital temperature compensation circuitry allows for near closed loop accuracy over temperature in an open loop sensor
• Small footprint, low-profile SOIC8 package suitable for space-constrained applications
• Filter pin simplifies bandwidth limiting for better resolution at lower frequencies
• 5 V, single supply operation
• Output voltage proportional to AC or DC current
• Factory-trimmed sensitivity and quiescent output voltage for improved accuracy
• Chopper stabilization results in extremely stable quiescent output voltage
• Nearly zero magnetic hysteresis
• Ratiometric output from supply voltage