ACEINNA expands AMR-based current sensors to support 3.3 volt applications

ACEINNA, a Massachusetts sensor manufacturer, has announced that its MCx1101 family of current sensors now supports 3.3 volt applications commonly found in EV charging stations, inverters, and motor controls.

The MCx1101 sensors are fully integrated, bi-directional current sensors. ACEINNA says they offer much higher DC accuracy and dynamic range compared with other solutions. For example, the ±20 A version has a typical accuracy of ±0.6% and is guaranteed to achieve an accuracy of ±2.0% (max) at 85° C. These new current sensors are enclosed in an industry-standard SOIC-16 package with a low-impedance (0.9 milli-ohm) current path, and are certified by UL/IEC/EN for isolated applications.

The new sensors also guarantee an offset of ±60 mA, or ±0.3% of FSR (max) over temperature, which allows the sensors to achieve high accuracy over a roughly 10:1 range of currents. ACEINNA says this provides significant improvement in dynamic range compared to leading Hall-sensor-based devices.

The new devices deliver high-accuracy 1.5 MHz signal bandwidth and, claims ACEINNA, industry-benchmark phase shift vs frequency, as well as fast output step response and 4.8 kV isolation. The company notes that all this makes these sensors ideal for current sensing in fast current control loops and protection for high-performance power supplies, inverters, and motor control applications.

ACEINNA says the sensors’ fast response and high bandwidth is also ideal for fast switching SiC and GaN-based power stages, enabling power system designers to make use of the higher speeds and smaller components enabled by wide band-gap switches. Output step response time is 0.3 microseconds (us). The MCx1101 sensors also provide an integrated over current detection flag to help implement OCD (Over Current Detection) required in modern power systems. Over current detection response time is 0.2 us.

The family of sensors includes ±50, ±20, and ±5 A ranges, and ACEINNA offers them in both fixed-gain and ratiometric-gain versions.

“Our integrated, AMR-based current sensor family provides the best performance for the price in the industry,” says ACEINNA VP Khagendra Thapa. “Unlike other AMR-based current sensing solutions on the market that require an extensive and time consuming integration to make them work, ours are plug-and-play.”