سنسور و مبدل سنسور جریان

Product Attributes

Introduction

The Allegro ACS709 current sensor IC provides an economical and precise solution for current sensing applications in industrial, automotive, commercial, and communications systems. The device is housed in a small SMT package for easy implementation in customer applications. The ACS709 consists of a precision linear Hall sensor IC and a copper conduction path located near the surface of the silicon die. The applied current flows through the copper conduction path, and the analog output voltage of the Hall sensor IC linearly tracks the magnetic field generated by the applied current. This patented package configuration maximizes the accuracy of the ACS709 due to the close proximity of the Hall element to the current being measured. Allegro's proprietary integrated shielding technology provides high immunity to dV/dt and stray electric fields from the current conductor, delivering low output ripple and low offset drift in high-end applications. The voltage on the overcurrent input (VOC pin) allows customers to define an overcurrent fault threshold for the device. When the current flowing through the copper conduction path (between the IP+ and IP− pins) exceeds this threshold, the open-drain overcurrent fault pin transitions to a logic-low state. Factory programming of the internal linear Hall sensor IC in the ACS709 ensures excellent accuracy for both analog and digital output signals. The internal resistance of the copper path used for current sensing is typically 1.1 mΩ to minimize power loss. In addition, the current conduction path is electrically isolated from the input and output of the low-voltage device. This allows the ACS709 series sensor ICs to be used in applications requiring electrical isolation without the need for optoisolators or other costly isolation techniques.

Features

• Industry-leading noise performance at 120kHz bandwidth via proprietary amplifier and filter design techniques
• Integrated shield significantly reduces capacitive coupling from current conductor to die due to high dV/dt, preventing offset drift in high-side applications
• Compact surface-mount QSOP-24 package
• High isolation voltage for line-powered applications
• 1.1mΩ primary conductor resistance for low power dissipation
• User-programmable overcurrent fault level
• Overcurrent fault output typically responds to overcurrent conditions within <2μs
• Filter pin capacitance sets analog signal bandwidth
• Typical output error of ±2%
• 3 to 5.5V single-supply operation
• Factory-trimmed sensitivity, quiescent output voltage, and associated temperature coefficients
• Chopper-stabilization technique for ultra-stable quiescent output voltage
• Ratiometric output with respect to supply voltage

Applications

• Motor control and protection
• Load management and overcurrent detection
• Power conversion, battery monitoring, and UPS systems