Allegro MicroSystems has launched new XtremeSense™ tunnel magnetoresistance (TMR) current sensors which provide superior noise performance and perform precise current measurements in high-voltage, power-dense clean energy applications.
The XtremeSense TMR technology is characterized by higher magnetic sensitivity, lower power consumption, and a smaller footprint than other magnetic current-sensing technologies such as Hall effect sensors, anisotropic magnetoresistance (AMR), and giant magnetoresistance (GMR).
Average noise of 5 mA in the CT4022 and CT4032 TMR sensors is half that of earlier TMR solutions, and four times less than that of Hall effect integrated conductor solutions. This noise performance allows manufacturers to achieve highly efficient power conversion, even when supplying light loads, a benefit which is of particular value in clean energy systems such as heat pumps and solar power inverters.
The CT4022/32 TMR current sensors measure current flowing through an integrated conductor while rejecting interference from external stray magnetic fields. Integrated galvanic isolation enables low-side, high-side or in-line current sensing in applications operating at up to 1,000 V. The resistance in the primary conductor is 1 mΩ, which enables the sensors to withstand high inrush current and to minimize power loss.
The CT4022 is supplied in an industry-standard 8-pin SOIC package, and the CT4032 in a 16-pin wide-body SOIC.
Part supported: CT4022
Board part number: ACSEVB-LC8-LZ6
Part supported: CT4032
Board part number: ACSEVB-MA16-LA16
Allegro MicroSystems evaluation boards simplify the evaluation process for its tunnel magnetoresistance (TMR) current sensors. The boards provide test points for convenient access to device pins, allowing for quick measurement and validation without the need for complex test set-ups.
The board’s six-layer PCB with 2 oz copper weight on all layers offers good thermal performance and heat dissipation, for precise and reliable current measurements.
Sensor integrated current loop resistance can be measured directly on the evaluation board. The voltage drop can also be measured, to enable designers to approximate power loss in the package.
Allegro supplies a bare PCB without the sensor mounted on it. This is for the design engineer to assemble the board with the desired current sensor IC.
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*Available to pre-qualified EMEA customers only.
