Allegro®The ACS712 provides an affordable and accurate solution for AC or DC current sensing in industrial, commercial, and communications systems. The device is packaged for easy customer implementation. Typical applications include motor control, load detection and management, switching power supplies, and overcurrent fault protection. The device is not intended for use in automotive applications.
The device has a precise low biasLinear Hall sensorscircuit, and its copper current path is close to the surface of the wafer. The current applied through this copper current path generates a magnetic field that can be sensed by the integrated Hall IC and converted into a proportional voltage. Device accuracy is optimized by placing the magnetic signal close to the Hall sensor. The precise proportional voltage is provided by a chopper-stabilized, chopper-type low-bias BiCMOS Hall IC that is factory programmed with precision.
The output of the device has a positive slope (>V) as the current rises through the primary copper current path (from pins 1 and 2, to 3 and 4) that are used as the current sensing pathIOUT(Q))。 The internal resistance of this conduction path is typically mΩ and has low power loss. The thickness of the copper wire allows the device to operate under overcurrent conditions of up to 5×. The terminals of the conduction path are electrically insulated from the sensor pins (pins 5 through 8). This allows the ACS712 current sensor IC to be used in applications that require electrical isolation without the use of optoelectronic insulators or other expensive insulation technologies.
The ACS712 is available in a small surface-mount SOIC8 package. The lead holder plating is 100% matte tin plating and is compatible with standard lead (Pb) printed circuit board assembly processes. Internally, the device is Pb-free, except for flip-mount use of high-temperature leaded solder balls that are currently exempt from RoHS. The device is fully calibrated before shipping from the factory.
- Low noise analog signal path
- The device bandwidth is programmable through a new filter pin
- 5 μs output rise time, corresponding to step input current
- 80 kHz bandwidth
- The total output error is 1.5% when TA= at 25°C)
- Small low profile SOIC8 package
- 1.2 mΩ internal conduction resistance
- 2.1 V between pins 1-4 and 5-8RMSMinimum insulation voltage
- 5.0 volts, single-supply operation
- 66 to 185 mV/A output sensitivity
- The output voltage is proportional to AC or DC current
- Factory accuracy calibration
- Very stable output bias voltage
- Near-zero hysteresis
- Proportional output of the supply voltage
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