The Allegro™ ACS726 current sensor IC family provides an affordable, accurate solution for AC current sensing in industrial, commercial, and communications systems. The device is packaged for ease of use. Typical applications include motor control, load detection and management, switching power supplies, and overcurrent fault protection.
Fully differential outputs provide excellent immunity to output bias drift and common-mode noise.
The ACS726 is the first current sensor IC to include a fully differential back-end amplifier (BEA) with gain and bandwidth adjustable through an external RC network. The BEA is completely self-contained and can be disconnected when not in use, reducing power consumption.
The device consists of a low-biased, precision linear Hall sensor circuit with a copper current path close to the surface of the die. 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. By bringing the magnetic field closerHall sensorto optimize device accuracy. The accurate proportional voltage is provided by a chopper-stabilized, chopper, low-bias BiCMOS Hall IC that is accurately programmed after packaging. As more and more current flows through the copper main current path, from pins 1 and 6 to pins 7 and 12, the output of the device is a positive differential voltage (V).OUTP – VOUTN)。 The preceding path is the path used by current sensing. The internal resistance of this current path is typically 1.1 mΩ and has low power loss.
The terminals of the current path are electrically isolated from the sensor IC signal lines (pins 13 through 24). This allows the ACS726 current sensor IC to be used in high-side current sensing applications that do not use high-side differential amplifiers or other costly insulation techniques.
The ACS726 is available in a small, low-profile surface mount QSOP24 package (suffix LF). The leadframe is 100% matte tin plating for compatibility with standard lead-free printed circuit board assembly processes. The device is internally lead-free, with the exception of flip-chip high-temperature leaded solder balls that currently enjoy RoHS exemptions. The device (excluding BAE) is fully calibrated before shipment from the factory.
- The fully differential structure improves resistance to bias drift and common-mode noise
- The backup differential back-end amplifier uses a simple RC network for externally adjustable gain and bandwidth
- Bandwidth is greatly increased through patented amplifier and filter design processes
- High bandwidth 120 kHz analog output
- Patented integrated digital temperature compensation circuitry enables near-closed-loop accuracy over the entire temperature range in open-loop sensors
- 1.1 mΩ primary conductor resistance with low power consumption and high inrush current tolerance
- The small, slim QSOP24 package is ideal for space-constrained applications
- The integrated screen virtually eliminates capacitive coupling from high dV/dt transients between current conductors and wafers
- 3 to 3.6 V, single-supply operation
- Factory-calibrated sensitivity and quiescent output voltage are used to improve accuracy
- The stable chopper results in an extremely stable quiescent output voltage
- Proportional output of the supply voltage
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