Isolated, coreless Hall-effect current sensor with fast over-current detection
The MCS1812 is a linear current sensor from Monolithic Power Systems which uses a differential Hall array to cancel out any stray magnetic field and has configurable over-current detection (OCD) with a 1 μs response time.
Rated to handle current from 5 A to 100 A, the primary conductor of the current sensor features low resistance of 0.8 mΩ. This resistance allows large current flow to pass close to an integrated circuit which contains high-accuracy Hall sensors.
A magnetic field current is generated by this current and sensed at two different points by the integrated Hall transducers. The difference in the magnetic field between these two points is converted into a voltage which is proportional to the applied current.
A low stable offset is achieved by using the spinning current technique. To minimize component cost, galvanic isolation between the pins of the primary conductive path and the leads of the sensor, means that the MCQ1812 can be used to replace opto-isolators or other costly isolation devices.
The MCQ1812 is offered in a SOIC16 WB package, and the MCQ1812 is qualified to AEC-Q100 Grade 1, and has the same specification as the MCS1812, but with 0.3 mΩ internal conductor resistance.