ACS756 Fully Integrated, Hall Effect-Based Linear Current Sensor with 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor - ALLEGRO MICROSYSTEMS - #1

■ Industry-leading noise performance through proprietary amplifier and filter design techniques

■ Total output error 0.8% at T_A = 25°C

■ Small package size, with easy mounting capability

■ Monolithic Hall IC for high reliability

■ Ultra-low power loss: 130 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 u,s 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

The Allegro ACS756 family of current sensors 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 ofa precision, low-offset linear Hall sensor circuit with a copper conduction path located near the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. Device accuracy is optimized through the close proximity ofthe 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 ofthe device has a positive slope (>V_CC / 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 sensing. The internal resistance of this conductive path is 130 u,£2 typical, providing low power loss.

Engineering samples available on a limited basis. Contact your local sales or applications support office for additional information.

Additional leadforms available for qualifying volumes

+5 V

1

1

IP+ ^VCCh

ACS756

^cbyp

0.1 uF

3

GNDr

5

IP-

VIOUT

^vout

Rf

Application 1. The ACS756 outputs an analog signal, V₀ut , that varies linearly with the uni- or bi-directional AC or DC primary sensed current, I_P , within the range specified. C_F is for optimal noise management, with values that depend on the application.

ACS756-DS