Accurate TMR current sensor offers high bandwidth
The CT455 from Allegro MicroSystems is suitable for use in measuring current in power-conversion applications that use wide bandgap semiconductors, and handles fast-switching behavior while maintaining high measurement accuracy.
Allegro MicroSystems has added the CT455 to its XtremeSenseâ„¢ family of tunnel magnetoresistance (TMR) current sensors. The new sensor provides superior noise performance and performs precise current measurements in high-voltage, power-dense consumer and industrial 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, anisotropic magnetoresistance (AMR), and giant magnetoresistance (GMR).Â
The CT455 operates across two standard magnetic field ranges, translating the magnetic field strength measurement into a linear analog output voltage. The CT455 is also available in a user-programmable variant, which enables end-of-line calibration of gain and offset. While the sensor is pre-programmed to compensate for gain and offset temperature drift, the ability to adjust offset and gain relaxes mechanical tolerances during sensor mounting. The device’s output response time is less than 300 ns, while operating current is around 6 mA.
The CT455 is supplied in two package options:Â
- 8-lead SOIC packageÂ
- Low-profile, industry-standard 8-lead TSSOP