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DRV5033: The application problem of DRV5033FA

WU YISYUAN
Expert 2165 points
Part Number: DRV5033

Hi,

I have some problems in use DRV5033.

The following specifications table,The magnetic flux moves at 1.8mT~6.8mT and recovers at 0.5~4.2mT.

This range is relatively large, and the action and recovery points are also coincident.

When we applied the design, can we set the magnetic flux of this magnet?

We tested the magnetic flux of the Hall element about 4.9mT.

According to the following parameter table, if the operating point of the Hall element is 5.5mT, is it impossible to operate normally?

Because Bop and Brp point are overlap.

 What is the magnetic flux distribution in mass production? How do I know this data?

thanks.

  • 0
    TI__Expert 5705 points

    Hi Yisyuan,

    While it is true that there is overlap in the BOP and BRP ranges, it is important to note that |BOP| > |BRP|. So [BOP,BRP] value-pairs that violate this condition are not possible.

    The general approach to designing with hall-effect switches is to ensure that:
    1) the flux applied to the hall switch in the ON condition is > max(|BOP|) (= 6.8mT for the DRV5033) AND
    2) the flux applied to the hall switch in the OFF condition is < min(|BRP|) (= 0.5mT for the DRV5033)

    For reliable switch operation, it is good to have some extra margin for variability in the magnet's positional accuracy and field strengths as these parameters can cause the applied flux to be lower or higher than the target values. For example, if the 3xsigma of the magnet's field strength distribution may be upto 20% of the mean then the design criteria after including a 20% margin for field strength would become:

    Bapplied(ON condition) > 6.8mT x 1.2 = 8.16mT
    Bapplied(OFF condition) < 0.5mT x 0.8 = 0.4mT

    This should prompt the selection of a sufficiently strong magnet. We have an online tool (screenshot below) which is very helpful in magnet selection for applications in which the sensor's sensitivity axis is aligned with the magnet's north-south axis. 

    I hope this helps. Please let us know if you have any questions.

    Best Regards,
    Harsha