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DRV5055-Q1: DRV5055-Q1

Part Number: DRV5055-Q1


My application needs (3.3mV / A )current sensing accuracy, so can i make my sensor output to 3.3mV /A by using some opamps or some kind of analog circuitry.

Is voltage divided circuit advisable to do ??


  • Kavuri,

    DRV5055-Q1 is typically used for detection of permanent magnets.  However, it may be capable of what you are asking. As long as sufficient magnetic field is produced by your wire, the sensor should detect it. You must be very careful about sensor placement though.  DRV5055-Q1 is specified relative to the input B-Field.  There are various sensitivity options:

    Additionally, the device is expecting the input magnetic field to be directed as shown, with the detected portion of the field travelling through the package from bottom to top.

    To use DRV5055-Q1 in your application, you must ensure that there is adequate magnetic field in the direction shown, and that the placement of the sensor will result in the specific gain you require. Magnetic flux density will diminish at greater distances.  You will have to determine the required placement to achieve this is practical.  A tool such as FEMM (finite element method magnetics) may prove useful for this purpose.

    If placed such that you exceed your desired ratio, you might be able to implement some sort of attenuating circuit to the output (voltage divider or amplifier with gain <1 for example) as long as the maximum output current is not exceeded.  

    Additionally, we do offer some magnetic current sensors which may be more appropriate for your use.  Please refer to the catalog offering below.  The sensitivity options are greater than you are requesting, but again, you may be able to scale it down. You must be careful not to exceed the output short circuit current.