ACS712: Fully integrated, Hall effect-based linear current sensor IC with 2.1 kVRMS voltage insulation and low resistance current conductor

ACS712 is a classic Hall current sensor launched by Allegro. It has been used in the domestic market for more than ten years. It can provide an economical and accurate solution for AC or DC current sensing in industrial, commercial and communication systems. The device package is easy for customers to implement. Typical applications include motor control, load detection and management, switched mode power supplies, and overcurrent fault protection.

The device has a precise low-bias linear Hall sensor circuit, and its copper current path is close to the surface of the wafer. The current applied through the copper current path can generate a magnetic field that can be sensed by the integrated Hall IC and converted into a proportional voltage. By bringing the magnetic signal close to the Hall sensor, the accuracy of the device is optimized. The accurate proportional voltage is provided by a chopper-stabilized low-bias BiCMOS Hall IC, which has been programmed for accuracy at the factory.

When the current through the main copper current path (from pins 1 and 2, to 3 and 4) that is used as a current sensing path continues to rise, the output of the device has a positive slope (》VIOUT(Q)). The internal resistance of this conductive path is usually mΩ, which has low power loss. The thickness of the copper wire allows the device to operate under overcurrent conditions up to 5×. The terminals of the conductive path are electrically insulated from the sensor pins (pins 5 to 8). This allows the ACS712 current sensor IC to be used in applications that require electrical insulation but do not use photoelectric insulators or other expensive insulation technologies.

ACS712 adopts a small surface mount SOIC8 package. The lead frame is plated with 100% matte tin plating, which is compatible with the standard lead-free (Pb) printed circuit board assembly process. Internally, the device is a lead-free product, except for the flip-chip method using high-temperature lead-containing solder balls that are currently exempt from RoHS. The device is fully calibrated before shipment from the factory.

These parts are in production, but have been determined to be unsuitable for the new design. This classification indicates that sales of this device are currently limited to existing customer applications. If it is a new design application, do not buy this device, because it is likely to be eliminated soon. No more samples. Date of status change: June 5, 2017.

Recommended replacement products: For the migration of existing customers, for new customers or new applications, please refer to ACS723.

ACS723: High-precision galvanic isolation current sensor IC

Allegro? ACS723 current sensor IC is an accurate and economical solution for AC and DC sensing in industrial, commercial and communication systems. The small package is very suitable for applications with limited space, and because it reduces the area of the circuit board, it also reduces the cost. Typical application areas include motor control, load detection and management, switch mode power supplies, and overcurrent fault protection.

The device has a precise, low-offset linear Hall sensor circuit and a copper conductive path near the surface of the wafer. The applied current through the copper conductive path can generate a magnetic field that can be sensed by the integrated Hall IC and converted into a proportional voltage. The accuracy of the device is optimized by the proximity of the magnetic field and the Hall sensor. The accurate proportional voltage is provided by a low-bias, chopper-stabilized BiCMOS Hall IC, which includes Allegro's patented digital temperature compensation device, which can achieve ultra-accurate performance based on temperature. When the current through a copper conductor path (from pins 1 and 2 to pins 3 and 4) increases, the output of the device has a positive slope, and this path is used for current sensing. The typical value of the internal resistance of this conduction path is 0.65 mΩ (using the LC SOIC8 package) and 0.85 mΩ (using the MA SOIC16W package), both of which have low power consumption characteristics.

The terminals of the conductive path are electrically isolated from the sensor leads (pins 5-8). As a result, ACS725 current sensors can be used in high-level current sensing applications without the need for high-level side differential amplifiers or other expensive isolation technologies.

ACS723 adopts a small flat surface mount SOIC8 package, or a high isolation voltage surface mount SOIC16W wide body package. The lead frame is plated with 100% matte tin, which is compatible with the standard lead-free (Pb) printed circuit board assembly process. The internal part of the device is lead-free, except for flip-chip high-temperature lead-based solder balls. Currently, the device is a RoHS exempt product. The device is fully calibrated before shipment from the factory.

Features and advantages:

Using the patented integrated digital temperature compensation circuit, you can obtain approximately closed-loop temperature measurement accuracy in an open-loop sensor.

UL60950-1 (ed. 2) certification

ACS723KMA: 800 Vpk / 565 Vrms or VDC

ACS723LLC: 420 Vpk or VDC / 297 Vrms

ACS723KMA: 1550 Vpk / 1097 Vrms or VDC

ACS723LLC: 2.4 kVrms

ACS723KMA: 4.8 kVrms

Dielectric strength voltage

Basic isolation working voltage

Reinforced isolation working voltage

With proprietary amplifier and filter design technology, the device has industry-leading noise performance, and the bandwidth is also significantly improved

Pin selectable bandwidth: 80 kHz (high bandwidth application) or 20 kHz (low noise performance).

The primary conductor has low power loss and large inrush current resistance capacity.

ACS723LLC: 0.65 mΩ

ACS723KMA: 0.85 mΩ

Package:

ACS723LLC: Small and flat SOIC8 package suitable for space-constrained applications

ACS723KMA: Flat SOIC16 wide-body package, suitable for high isolation voltage applications in small space

ACS723LLC: Integrated shielding actually eliminates the capacitive coupling from the current conductor to the chip, significantly suppressing output noise caused by high dv/dt transients

4.5 to 5.5 volts, single power supply operation

Output voltage proportional to AC and DC current

Sensitivity and static output voltage are calibrated at the factory to achieve higher accuracy

Chopper stabilization achieves extremely stable static output voltage

Near-zero hysteresis

Proportional output of power supply voltage

The ACS71240 series of monolithic Hall-effect current sensor ICs comply with the automotive AEC-Q100 standard and are the next-generation improved products of the popular Allegro ACS711 series of current sensor ICs. These improvements include output signal immunity to stray magnetic fields (generated by adjacent motors or current-carrying wires), improved output signal accuracy (typical value <+/-1.5%), and output signal immunity to noise power supply voltage rails Disturbance. The device also has a dedicated fast over current fault output with a typical response time of 1.5 us. This fast fault output provides an easy way to detect short-circuit events and prevents damage to MOSFETs or IGBTs in inverters, motors, or other switching power electronics applications.

ACS71240 offers two very small package options, each package provides different levels of galvanic isolation. This tiny 3mm x 3mm wettable flanking QFN package can be used on voltage rails up to 120VDC and can support solder joint inspection required for zero PPM automotive applications. The standard size SOIC8 package is UL certified as having an isolation of 2400VRMS, and the working voltage is 420VDC or 297VRMS.

The ACS71240 series is designed to replace shunt resistors, operational amplifiers, current transformers, and voltage isolators in applications that require small-size monolithic sensor solutions. These fully integrated solutions eliminate the need for discrete components that occupy printed circuit board area, reducing the overall cost of current sensing. The sensor can use 5V or 3.3V power supply.

Obtained AEC-Q100 certification

Differential Hall sensor suppresses common mode stray magnetic field

Over current fault, the factory programmable trip range is 50% to 200% of full-scale current

Non-proportional output provides immunity to noisy power supplies

Electrical isolation:

QFN package: 120VDC working voltage

The SOIC8 package is UL certified as 2400VRMS, and the working voltage is 420VDC or 297VRMS

Lower power loss:

0.6 mΩ internal conductor resistance (QFN package)

1.2 mΩ internal conductor resistance (SOIC8 package)

The integrated shield actually eliminates the capacitive coupling from the current conductor to the chip, and significantly suppresses the output noise caused by high dv/dt transients

Output voltage proportional to AC and DC current

High bandwidth 120 KHz analog output reduces response time in control applications

Factory calibrated sensitivity and static output voltage are used to improve accuracy

3.3 and 5 V, single supply operation

The small and slim QFN and SOIC8 packages are suitable for space-constrained applications.