Allegro has developed a range of high-current automotive-grade current sensors in packages only 1.5mm thick.
The Hall sensors are differential to reject common-mode fields – from nearby current-carrying conductors, for example.
The devices consist of a precision low-offset linear Hall circuit with a copper conduction path located near the die (see photo).
Applied current generates a magnetic field which the Hall IC converts into a proportional voltage.
Errors are cut by a chopper-stabilized signal path and digital temperature compensation, and proprietary internal shielding increases immunity to dV/dt in the sense wire and and stray electric fields – important for high-side high-voltage applications. Isolation is up to 100V.
Automotive applications include electric power steering, dc-dc converters, oil pumps and air-con pumps.
Allegro also sees the sensor in industrial applications such as motor drives, plus in computer servers and telecom inverters.
|8.8||7 lead SOT||-40 to 125°C||Yes|
|17.6||7 lead SOT||-40 to 125°C||Yes|
|ASEK781KLR-150B-T||demo board||-40 to 125°C||No|
|ASEK781KLR-150U-T||demo board||-40 to 125°C||No|
|ACS781LLRTR-050B-T||both||±50||26.4||7 lead SOT||-40 to 150°C||Yes|
|ACS781LLRTR-050U-T||uni||0-50||39.6||7 lead SOT||-40 to 150°C||Yes|
|ACS781LLRTR-100B-T||both||±100||13.2||7 lead SOT||-40 to 150°C||Yes|
|ACS781LLRTR-100U-T||uni||0-100||26.4||7 lead SOT||-40 to 150°C||Yes|
|ASEK781LLR-050B-T||demo board||-40 to 150°C||No|
|ASEK781LLR-050U-T||demo board||-40 to 150°C||No|
|ASEK781LLR-100B-T||demo board||-40 to 150°C||No|
|ASEK781LLR-100U-T||demo board||-40 to 150°C||No|
Table transcription not guaranteed, ACS780 parts are similar