The Allegro ACS706 family of current sensors provides economical and

precise solutions for 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, switched-mode power supplies, and overcurrent fault protection.

The device consists of a precision, low-offset 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 which 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. 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 pins 1 and 2, to

pins 3 and 4), which is the path used for current sensing. The internal resistance of

this conductive path is typically 1.5 m¦¸, providing low power loss. The thickness

of the copper conductor allows survival of the device at up to 3¡Á overcurrent

conditions. The terminals of the conductive path are electrically isolated from the

sensor leads (pins 5 through 8). This allows the ACS706 family of sensors to be

used in applications requiring electrical isolation without the use of opto-isolators

or other costly isolation techniques.

 

The ACS706 is provided in a small, surface mount SOIC8 package. The leadframe

is plated with 100% matte tin, which is compatible with standard lead (Pb) free

printed circuit board assembly processes. Internally, the flip-chip uses high-temperature

Pb-based solder balls, currently exempt from RoHS. The device is fully

calibrated prior to shipment from the factory.

 

 

• Small footprint, low-profile SOIC8 package

• 1.5 m¦¸ internal conductor resistance

• Excellent replacement for sense resistors

• 1600 VRMS minimum isolation voltage between pins 1-4 and 5-8

• 4.5 to 5.5 V, single supply operation

• 50 kHz bandwidth

• 100 mV/A output sensitivity and 20 A dynamic range

• Output voltage proportional to ac and dc currents

• Factory-trimmed for accuracy

• Extremely stable output offset voltage

• Near-zero magnetic hysteresis

• Ratiometric output from supply voltage

 

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