Allegro™ ACS724Current sensorICs are accurate and economical solutions for AC/DC sensing in industrial, automotive, commercial, and communications systems. The small package is ideal for applications where space is at a premium, and cost is reduced due to reduced board area. Typical application areas include motor control, load detection and management, switching power supplies, and overcurrent fault protection.
The device features a precise, low-offset linear Hall sensor circuit with a copper conduction path near the die surface. The applied current through this copper conduction path generates a magnetic field that can be induced by the integrated Hall IC and converted into a proportional voltage. Current is sensed differentially to suppress common-mode fields and improve measurement accuracy in magnetically noisy environments. The proximity of the magnetic field to the Hall sensor optimizes intrinsic device accuracy. The low-offset, chopper-stabilized BiCMOS Hall IC provides an accurate proportional voltage, and the IC is also programmed to be accurately programmed after packaging. The output of the device has a positive slope as the current increases through the primary copper conductor path (from pins 1 and 2 to pins 3 and 4), which is used for current sensing. This conduction path has a typical internal resistance of 1.2mΩ and low power loss.
The terminals of the conduction path are galvanically isolated from the sensor leads (pins 5-8). This allows the ACS724 current sensor to be used in high-level current sensing applications without the need for high-side differential amplifiers or other expensive isolation techniques.
The ACS724 is available in a small package mount SOIC8 with a flat surface. The lead holder is 100% matte tin plated and is compatible with standard lead (Pb) printed circuit board assembly processes. The device is internally Pb-free, with the exception of flip-chip high-temperature lead-based solder balls, which are currently RoHS exempt. The device is fully calibrated before shipment at the factory.
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- Differential Hall sensing rejects common-mode fields
- 1.2 mΩ primary conductor with low power loss and high inrush current capability.
- Integrated shielding virtually eliminates capacitive coupling from the current conductor to the die, significantly suppressing output noise caused by high dv/dt transients
- Thanks to proprietary amplifier and filter design techniques, the device has industry-leading noise performance and significantly improved bandwidth
- The high bandwidth 120 kHz analog output reduces response time in control applications.
- The filter pin allows the user to filter the output signal at a lower bandwidth to improve resolution
- With a patented integrated digital temperature compensation circuit, you can achieve near-closed-loop temperature measurement accuracy in open-loop sensors.
- The small, low-profile SOIC8 package is ideal for applications where space is at a premium
- The filter pin simplifies bandwidth limiting for better resolution at lower frequencies.
- 3 to 5.5 volts, single supply operation
- The output voltage proportional to the AC and DC current
- Factory calibrated sensitivity and quiescent output voltage for greater accuracy
- Stable chopping results in an extremely stable quiescent output voltage
- Near-zero hysteresis
- Proportional output of the supply voltage
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