Compact new TMR current sensors minimize power losses
The CT4022 and CT4032 from Allegro MicroSystems offer very low-noise performance and high immunity to magnetic interference. Low power consumption makes these sensors ideal for use in clean energy applications.
Allegro MicroSystems has launched new XtremeSenseā¢ 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).Ā
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.Ā
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 mĪ©, which enables the sensors to withstand high inrush current and to minimize power loss.Ā
The CT4022 is supplied in an industry-standard 8-pin SOIC package, and the CT4032 in a 16-pin wide-body SOIC.