Sensors

400 KHz Hall-effect sensors boast 5 kV isolation rating

26th June 2020
Mick Elliott

Hall-effect current sensors offering 400kHz sensing bandwidth up to 180 A with low offset and better than 1% typical total accuracy over the full -40°C to 150°C automotive temperature range have been released by Allegro Microsystems.

The high speed operation allows customers to operate at higher switching frequencies and design SiC and GaN switching platforms that improve efficiency.

The ACS37002 sensor also employs differential sensing for high immunity to external magnetic field disturbances and is available in three surface-mount package options- optimising either low-noise, high-isolation, or lowest-in-class internal power loss.

The sensor suits demanding green energy industrial and electric vehicle applications, such as solar power inverters, on-board charger power-factor correction, DC/DC converter loop control, and xEV high voltage inverters.

The plug-and-play feature from Allegro’s factory programming allows designers to achieve a faster time-to-market in the increasingly competitive green energy and high-efficiency automotive markets.

Faster switching improves efficiency in most power conversion applications, which is possible with the increasing adoption of SiC and GaN switches.

Allegro created the ACS37002 in direct response to this trend by maximising the speed of the Hall plates.

A higher speed current sensor with high accuracy and DC stability allows for tighter control of the motor or power converter control loop—improving overall efficiency of the system. By enabling faster switching, the ACS37002 also helps designers to reduce overall system size.

“With the trend of ever increasing efficiency in automotive and green energy, we’re seeing more and more designers adopt SiC and GaN,” explains Briano. “The 400 kHz bandwidth of this device allows designers to accurately sense these faster switching currents.”

Factory-calibrated with a high degree of integration, the sensor helps designers reduce time to market by decreasing design cycle time. It integrates a variety of features, including:

  • Fast over-current fault detection function for system reliability;
  • Reference output for accuracy in noisy environments;
  • 4 pin-selectable sensitivity settings in a single component, which can reduce inventory part numbers on platform products.

The ACS37002 is available in three different SOICW-16 packages:

  • LA package is optimised for higher sensitivity and lower noise;
  • MA package provides high isolation of 4.8 kVrms;
  • MC package is Allegro’s newest, combining best-in-class conductor resistance of 0.27 µW and highest isolation rating of 5 kVrms for applications where ultra-low power loss and high reinforced isolation are needed.

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