ACS712
Fully Integrated, Hall Effe-Based Linear Current Sensor IC with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conduor
Features
- Low-noise og signal path
- Device bandwidth is set via the new FILTER pin
- 5 µs output rise time in response to step input current
- 80 kHz bandwidth
- Total output error 1.5% at TA= 25°C
- all footprint, low-profile SOIC8 package
- 1.2 mΩ internal conduor resistance
- 2.1 kVRMSminimum isolation voltage from pins 1-4 to pins 5-8
- 5.0 V, single supply operation
- 66 to 185 mV/A output sensitivity
- Output voltage proportional to AC or DC currents
- Faory-trimmed for accuracy
- Extremely stable output offset voltage
- Nearly zero magnetic hysteresis
- Ratiometric output from supply voltage
Description
The Allegro® ACS712 provides economical and precise solutions for AC or DC current sensing in industrial, commercial, and communications systems. The device package allows for easy implementation by the customer. Tical applications include motor control, load deteion and management, switched-mode power supplies, and overcurrent fault proteion. The device is not intended for automotive applications.
The device consists of a precise, low-offset, linear Hall sensor circuit with a copper conduion path located near the surface of the die. Applied current flowing through this copper conduion 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 after packaging.
The output of the device has a positive slope (>VIOUT(Q)) when an increasing current flows through the primary copper conduion path (from pins 1 and 2, to pins 3 and 4), which is the path used for current sensing. The internal resistance of this conduive path is 1.2 mΩ tical, providing low power loss. The thickness of the copper conduor allows survival of the device at up to 5× overcurrent conditions. The terminals of the conduive path are elerically isolated from the sensor IC leads (pins 5 through 8). This allows the ACS712 current sensor IC to be used in applications requiring elerical isolation without the use of opto-isolators or other costly isolation techniques.
The ACS712 is provided in a all, surface mount SOIC8 package. The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board embly 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 faory.
