Linear Current Sensors offer 20 A dynamic range.
Press Release Summary:
Featuring isolation voltage to 1,600 Vrms, bi-directional Series ACS706 consists of low-offset linear Hall sensor circuit with copper conduction path located near surface of die. Output has positive slope when increasing current flows through primary conduction path. Units measure ac or dc currents and are suited for motor control, load detection, switched-mode power supplies, and overcurrent fault protection. Internal resistance is typically 1.5 mohm, providing low power loss.
Original Press Release:
Allegro Introduces New Bidirectional 1.5m Hall-Effect-Based Linear Current Sensor Family
ACS706 Family has 20 A Dynamic Range and Increased Isolation Voltage to 1600 Vrms
Worcester, MA, Nov. 28, 2005 - Allegro MicroSystems, Inc. announces a new family of current sensors that provide economical and precise solutions for current sensing in industrial, commercial, and communications systems. These are isolated integrated current sensing devices for easy implementation in customer applications. The ACS706 devices are bi-directional sensors that can measure either AC or DC currents. The power lead frame is designed for extremely low power loss, and is electrically isolated from the sensor signal leads. This isolation allows ACS706 sensors to be used in applications requiring electrical isolation without the addition of other isolation components. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection.
The ACS706 family consists of a precision, low-offset linear Hall sensor circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic signal to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy at the factory.
The output of the devices have a positive slope (>VCC / 2) when an increasing current flows through the primary copper conduction path (from pins 1 and 2, to pins 3 and 4), which is the path used for current sensing. The internal resistance of this conductive path is typically 1.5 mohm, providing low power loss. The thickness of the copper conductor allows survival of the device at up to 3 times the overcurrent conditions. The terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8).
The ACS706 family is provided in a small, surface mount SOIC8 package (shown above). The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes. Internally, the flip-chip uses high-temperature Pb-based solder balls, currently exempt from RoHS. These devices are fully calibrated prior to shipment from the factory.
The ACS706 family is priced at $1.40 in quantities of 10,000 and has an 8 week lead-time to market. Further information on these products can be found at www.allegromicro.com/sf/0706.
About Allegro
Allegro MicroSystems, Inc. is a supplier of advanced mixed-signal power semiconductors and Hall-effect sensors targeted toward the automotive, communications, computer/office automation, consumer and industrial markets. Allegro maintains a leadership position in the integrated magnetic sensor and integrated motor driver product segments. With more than 2,000 employees, Allegro is headquartered in Worcester, MA. Further information about Allegro, including free samples of our products, can be found at www.allegromicro.com.
