ACS712ELCTR-30A-T SENSOR

Technical Specifications of ACS712ELCTR-30A-T

Datasheet	ACS712ELCTR-30A-T datasheet
Category	Sensors, Transducers
Family	Current Transducers
Manufacturer	Allegro MicroSystems, LLC
Series	–
Packaging	Tape & Reel (TR)
Part Status	Active
For Measuring	AC/DC
Sensor Type	Hall Effect, Open Loop
Current – Sensing	30A
Number of Channels	1
Output	Ratiometric, Voltage
Sensitivity	66mV/A
Frequency	DC ~ 80kHz
Linearity	±1.5%
Accuracy	±1.5%
Voltage – Supply	5V
Response Time	5μs
Current – Supply (Max)	13mA
Operating Temperature	-40°C ~ 85°C
Polarization	Bidirectional
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154″, 3.90mm Width)

ACS712ELCTR-30A-T Description

The AllegroTM ACS712 is a precise and cost-effective AC/DC current sensor for industrial, commercial, and telecommunications applications. The device package allows for straightforward customer implementation. Common applications include load detection, motor control and management, switch-mode power supply, and overcurrent fault protection. The device is not intended for use in automobiles. The chip’s circuitry is a precise linear Hall circuit with a low offset and an extremely close copper conduction channel to the die’s surface.

When an electrical current flow through a copper conductor, a magnetic field is generated, and the Hall IC can convert this magnetic field into a voltage. If the magnetic signal source is close to the Hall transducer, the subsequent device measurements will be as accurate as possible. After packing, a precise and proportional voltage is produced by programming the low-offset, stabilized BiCMOS Hall IC. When an increasing current flow along the path is utilized for current sampling (from pins 1 and 2 to pins 3 and 4), the output of the device has a positive slope (>VIOUT(Q)). This conductor has little power loss because of its 1.2 m of internal resistance. Due to the thickness of the copper conductor, the device can tolerate overcurrents as high as 5. All signal leads are physically isolated from the terminals of the conductive channel (pins 5 through 8).

Implementing the ACS712 in an application avoids the need for more expensive isolation solutions such as optoisolators. The ACS712 is available in a small surface-mount SOIC8 package. Since the lead frame is plated with matte tin rather than glossy tin, it can be utilized for lead-free PCB assembly. Internally, the device is lead-free, except for the solder balls used in the flip-chip process, which are designed to withstand extremely high temperatures and are currently exempt from RoHS. Before leaving the manufacturer, the item is meticulously inspected and adjusted for best performance.

Features and Advantages

• An analog signal path with low noise levels.
• The new FILTER pin allows the bandwidth of the device to be adjusted.
• With a step input current, it takes 5 s for the output voltage to rise.
• With a bandwidth of 80 kHz.
• At TA= 25°C, the overall output error is 1.5%.
• The miniature size in a low-profile SOIC-8 housing.
• The internal resistance is 1.2 meters.
• Single-supply operation at 5,0 V with a minimum isolation voltage of 2.1 kV RMS between pins 1 through 4 and 5 through 8.
• 66–185 mV/A is the current output sensitivity.
• Voltage output that is variable with respect to alternating or direct current.
• Factory-adjusted for precision.
• The output offset voltage is surprisingly constant.
• The magnetic hysteresis is practically incomprehensibly small.
• Input voltage is proportional to the output voltage.

Definitions of Precision Characteristics

● Sensitivity (Sens) (Sens).

A 1A change in the primary current generates a proportional change in output. The sensitivity is calculated by multiplying the gain in millivolts per gauss (mV/G) from the linear integrated circuit amplifier by the sensitivity of the magnetic circuit. The factory-set gain of the linear IC amplifier maximizes the sensitivity (mV/A) of the device when it is operating at its maximum current.

● Noise (VNOISE) (VNOISE).

The total noise level is calculated by multiplying the Allegro Hall effect linear IC’s noise floor (1 G) by the amplifier gain (mV/G). The noise floor is derived from the thermal and shot noise recorded in Hall elements. Calculate the least detectable current by dividing the noise (in millivolts) by the sensitivity (in millivolts per ampere).

● Quiescent output voltage (VIOUT(Q)).

The output of the gadget with no primary current. Voltages of unipolar supply have a nominal value of VCC 2. VCC = 5 V equates to VIOUT(Q) = 2.5 V in this instance. The most likely sources of VIOUT(Q) variance are the resolution of the quiescent voltage trim on the Allegro linear IC and thermal drift.

● Electrical voltage offset (VOE).

The amount by which the device’s output deviates from its ideal quiescent value of VCC/ 2 for nonmagnetic reasons. By dividing by the device’s sensitivity (denoted by Sens), we may determine the device’s current consumption from the supplied voltage.

● Accuracy (ETOT) (ETOT).

Precision measures the deviation of the measured value from the target value. This is the total number of output mistakes. The right-hand plot of output voltage against the current vividly illustrates the precision.

Dynamic Response Characteristics Defined

• Power-On Period (tPO).

Before the device can detect an applied magnetic field, its internal components must be energized by the supply while the voltage is ramped up to its operational level. On the right-hand side of the graph, VCC(min) represents a power supply’s minimum specified operating voltage. At the same time, tPO is required for the output voltage to settle within 10% of its steady state value when applying a magnetic field.

• Rise time (tr).

When the device is at 10% of its maximum value and when it is at 90% of its maximum value, its bandwidth is determined by the time required for a step response: (-3 dB) = 0.35/tr. tr and tRESPONSE are impacted badly due to eddy current losses on the conducting IC ground plane.

• Chopper Stability Procedure

A clever circuit technique known as chopper stabilization is used to lower the offset voltage of a Hall element and its associated on-chip amplifier. Allegro’s Chopper Stabilization effectively prevents the output drift of Hall ICs brought on by environmental factors like temperature and package stress. This method for minimizing offsets is based on the modulation-demodulation cycle commonly employed in signal processing. In the frequency domain, modulation separates a DC offset signal from a magnetically produced signal. The modulated DC offset is then filtered away, while a low-pass filter allows the magnetically generated signal to pass through.

This chopper stabilization technique decreases the Hall IC output voltage’s sensitivity to environmental and mechanical disturbances. Devices manufactured using this method have an Electrical Offset Voltage that is highly stable, meaning it does not change in response to thermal stress and recovers its original value precisely after being subjected to thermal cycling. BiCMOS technology, which combines high-density logic integration and sample-and-hold circuitry with low-offset and low-noise amplifiers, is utilized to achieve this strategy.

Conclusion

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