Ideal for electric vehicle chargers, DC/DC converters, and industrial motor and IoT applications.
Allegro MicroSystems has announced a new family of monolithic Hall Effect current sensor ICs, qualified to AECQ100. Small and energy efficient, the ACS71240 family is ideal for electric vehicle chargers, DC/DC converters, as well as IOT and industrial motor applications. These new devices offer next-generation improvements over the popular Allegro ACS711 predecessor, including:
- Output signal immunity to stray magnetic fields (created by adjacent motors or current-carrying cables);
- Improved output signal accuracy (<+/- 1.5% typical);
- Output signal immunity to noisy supply voltage rails. The ACS71240 family also features an extremely fast dedicated fault-over-current output that has a typical response time of 1.5 μs, improving system safety. This fault output provides a simple means of detecting short circuit events that will prevent damage to MOSFETs or IGBTs in inverter, motor, and other switching electronics applications. “Allegro was the first company to introduce Hall-based integrated flip-chip current sensors that make it possible to offer simple SMD (Surface Mount Assembly), high SNR, and low power losses, while using a small PCB area.” explains Shaun Milano, Director of Allegro's current sensor product line.
"This new family represents the evolution of these innovative products and offers our customers enhanced safety, reliability and efficiency." The device is offered in two very small form factor package options, each with different levels of galvanic isolation. The small 3mm x 3mm QFN package, which is wettable on the side, can be used on voltage rails up to 120V DC and allows inspection of solder joints in automotive applications without PPM. The standard footprint SOIC8 package is UL listed to 2400V RMS insulation and offers a working voltage of 420V DC or 297V RMS.
The ACS71240 family is designed to replace shunt resistors, operational amplifiers, current transformers and voltage isolators in applications requiring small form factor monolithic sensor solutions. These fully integrated solutions reduce the overall cost of current sensing by eliminating discrete components that require PCB area. The sensors are offered for use on either 5V or 3,3V power sources.
