The Allegro™ ACS725 current sensor IC is an accurate and economical solution 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 accurate, low offsetLinear Hall sensorscircuit, and a copper conduction path near the surface of the wafer. 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 ACS725 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 ACS725 is available in SOIC8, a small package mount 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.
- 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.
- 3.3 V, 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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