ACS37030 and ACS37032 Current Sensors

Allegro's ACS37030 and ACS37032 are fully integrated current sensor ICs that sense current flowing through the primary conductor. There are two signal paths utilized, a Hall-effect element path to capture DC and low-frequency current information, and an inductive coil path to capture high-frequency current information. These two paths are combined to allow for the sensing of a wide frequency band with a single device.

The properties of the coil increase the signal-to-noise ratio (SNR) as frequency increases, minimizing noise seen at the output. The internal construction provides high isolation by magnetically coupling the field generated by current flow in the conductor to the fully monolithic Hall and coil IC. The current is sensed differentially by two Hall plates and two coils that subtract out interfering common-mode magnetic fields. The ACS37030 features a zero-current reference and the ACS37032 features an overcurrent fault with internal pull-up.

The ACS37030 and the ACS37032 are offered in the LZ fused-lead SOIC-6 package, providing 420 V_RMS reinforced isolation in a compact and more cost-effective package when compared to the SOICW-16 package. These sensors feature a voltage reference output pin for use in noisy supply environments. The SOIC-6 package has lower conductor resistance versus standard SOIC-8 packages and supports higher isolation up to 840 V_RMS basic isolation or 420 V_RMS reinforced isolation.