ACS711 Hall Effect Linear Current Sensor

ACS711 Hall Effect Linear Current Sensor

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Allegro Microsystems’ device consists of a linear Hall sensor circuit with a copper conduction path located near the surface of the die.

The Allegro ACS711 provides economical and precise solutions for AC or DC current sensing in <100 V audio, communications systems, and white goods.

The device consists of a linear Hall sensor circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field that is sensed by the integrated Hall IC and converted into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic signal to the Hall transducer.

The output of the device has a positive slope proportional to the current flow from IP+ to IP- (pins 1 and 2 to pins 3 and 4). The internal resistance of this conductive path is 0.6 mΩ for the EX package, and 1.2 mΩ for the LC package, providing a non-intrusive measurement interface that saves power in applications that require energy efficiency.

The ACS711 is optimized for low-side current sensing applications, although the terminals of the conductive path are electrically isolated from the sensor IC leads, providing sufficient internal creepage and clearance dimensions for a low AC or DC working voltage applications. The thickness of the copper conductor allows the survival of the device at up to 5× overcurrent conditions.

The ACS711 is provided in small, surface-mount packages: SOIC8 and QFN12. The lead frame is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes. Internally, the device is Pb-free, except for flip-chip high-temperature Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory.

Features

  • No external sense resistor required; single package solution
  • Economical low- and high-side current sensing
  • Output voltage proportional to AC or DC currents
  • ±12.5 A and ±25 A full-scale sensing ranges on LC package
  • ±15.5 A and ±31 A full-scale sensing ranges on EX package
  • Overcurrent FAULT trips and latches at 100% of full-scale current
  • Low-noise analog signal path
  • 100 kHz bandwidth
  • 3.0 V to 5.5 V, single-supply operation
  • Integrated electrostatic shield for output stability
  • Factory-trimmed for accuracy
  • Extremely stable output offset voltage
  • Zero magnetic hysteresis
  • Ratiometric output from supply voltage

more information: www.allegromicro.com

Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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