Surface-mount current sensor for high current density designs

November 13, 2019 //By Nick Flaherty
Allegro's ACS772/3 current sensor includes through-hole and surface-mount CB package options with enhanced working isolation voltage
Allegro's ACS772/3 current sensor includes through-hole and surface-mount CB package options with enhanced working isolation voltage

Allegro MicroSystems has launched a surface mount version of its high current fully integrated ACS772/3 current sensor in a “CB” package.

The automotive grade high voltage isolation current sensors already provide economical and precise solutions for both AC and DC current sensing up to 400A. The surface-mount leadform option for the CB package provides flexibility for space constrained applications.

“This is a classic, ‘You asked – we listened.’  innovation with purpose moment for us,” said Shaun Milano, Business Unit Director for Current Sensors. “Our customers want flexibility, and we’re excited to provide these innovative, robust solutions in this new surface-mount option to complement our highly popular through-hole version. High current PCB designs improve power density and efficiency and this surface-mount option allows customers to realise these advantages with a simpler manufacturing process.”

The ACS772/3 family of current sensor ICs has a  2.5µs response time that enables overcurrent fault detection in safety-critical applications along with a working isolation voltages up to 1300kV+ for basic DC voltage, and 650V+ for reinforced isolation DC voltage. This avoids the need for opto-isolators or other isolation techniques.  

The long term accuracy of ±2.1 percent over the lifetime of the chip also makes the ACS772/3 current sensor suitable for a range of applications from industrial robotics to electric vehicles.

“Many of our customers, especially in green energy applications, are looking for higher working voltages which can provide efficiency improvements and cost reductions in their systems,” said Milano. “In solar applications for instance, raising the system voltage allows for longer strings, which eliminates significant wiring and connector combiner boxes.  It also allows for longer panel strings with higher rated output inverters, which reduces losses and improves efficiency.  These improvements are a win-win for our customers.”

www.allegromicro.com


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