Sensors

Current sensor IC suits space-constrained applications

22nd May 2020
Mick Elliott

Allegro Microsystems’ ACS37612 standalone coreless current sensor IC is now in stock at distributor Digi-Key.

It provides an economical and precise solution for AC and DC current sensing without requiring a magnetic concentrator core or a shield.

The ACS37612 measures currents from 200 A to greater than 1,000 A flowing through a PCB or busbar with a typical accuracy of 1%.

The differential Hall-based sensing topology used to measure the magnetic fields virtually eliminates error from common-mode stray magnetic field without the need of a laminated shield required by competing solutions, which reduces the design size and bill of materials (BOM).

High isolation is achieved via the no-contact nature of this simple assembly.

A 240 kHz bandwidth makes the device ideal for inverter phase current sensing, load detection and management, power supplies, and DC/DC converters where fast switching is required.

The high response-time enables overcurrent fault detection in safety-critical applications.

The ambient operating temperature range of -40°C to +150°C and a stellar ESD rating make this IC ready for harsh automotive environments.

The ACS37612 current sensor IC is offered in a low-profile 8-pin surface-mount TSSOP package (thin-shrink small outline package, suffix LU) that is ideal for space-constrained applications while allowing simple surface-mount assembly.

There are a nuber of applications. These include:

  • Automotive:
    • High-voltage traction inverters
    • Auxiliary inverters for integrated
    • Starter generators (iBSG):
      • 12 V and 48 V systems
      • Direct connect or belt-driven systems
    • Battery disconnect junction boxes
    • Disconnect and smart fuse functions
    • DC/DC converters
  • Industrial:
    • Switching power supplies
    • DC/DC converters
    • DC/AC inverters
    • Grid infrastructure and power distribution

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