Industrial Electronics

Aceinna expands AMR-based current sensor family

12 June 2019

Aceinna announced that their MCx1101 family of current sensors now supports 3.3 V applications. These highly accurate, wide bandwidth anisotropic magneto resistive (AMR)-based current sensors are now available for a wide range of analog-to-digital conversion (ADC) and microprocessor-based power systems and applications.

The MCx1101 are fully integrated, bi-directional current sensors that offer much higher DC accuracy and Source: AceinnaSource: Aceinnadynamic range compared with alternative 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 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 current sensors also guarantee an offset of ±60 mA, or ±0.3% of FSR (max) over temperature, which means that high accuracy can be achieved over a roughly 10:1 range of currents providing significant improvement in dynamic range versus leading Hall-sensor-based devices.

These devices deliver a unique combination of high accuracy, 1.5 MHz signal bandwidth with industry benchmark phase shift versus frequency, fast output step response and 4.8 kV isolation, making them ideal for current sensing in fast current control loops and protection for high performance power supplies, inverters and motor control applications.

The fast response and high bandwidth of the MCx1101 is also ideal for fast switching silicon carbide (SiC) and gallium nitride (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 us. The MCx1101 also provides an integrated over current detection (OCD) flag to help implement OCD required in modern power systems. OCD response time is 0.2 us.

The family includes ±50, ±20 and ±5 A ranges, and is offered in both fixed gain (MCA1101) and ratiometric gain (MCR1101) versions.

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