Tuesday, October 29, 2013

Allegro ACS756SCA-100B-PFF-T hall effect current sensor

ACS756SCA-100B-PFF-T Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor

The Allegro ACS756 family of current sensor ICs provides economical and precise solutions for AC or DC current sensing in industrial, automotive, commercial, and communications systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection and management, power supplies, and overcurrent fault protection. 

The device consists of a precision, low-offset linear Hall circuit with a copper conduction path located near the die. Applied current flowing through this copper conduction path generates a magnetic field which the Hall IC converts into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic signal to the Hall transducer. 

A precise, proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy at the factory. 

The output of the device has a positive slope (>VCC/ 2) when an increasing current flows through the primary copper conduction path (from terminal 4 to terminal 5), which is the path used for current sampling. The internal resistance of this conductive path is 130 μΩ typical, providing low power loss. 

Features and Benefits

  • Industry-leading noise performance through proprietary amplifier and filter design techniques 
  • Total output error 0.8% at TA= 25°C 
  • Small package size, with easy mounting capability 
  • Monolithic Hall IC for high reliability 
  • Ultra-low power loss: 130 μΩ internal conductor resistance
  • 3 kVRMS minimum isolation voltage from pins 1-3 to pins 4-5 
  • 3.0 to 5.0 V, single supply operation
  • 3 μs output rise time in response to step input current 
  • 20 or 40 mV/A output sensitivity
  • Output voltage proportional to AC or DC currents
  • Factory-trimmed for accuracy
  • Extremely stable output offset voltage 
  • Nearly zero magnetic hysteresis