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DRV5033: DRV5033 ditance range

Ivan Kilovych
Prodigy 30 points
Part Number: DRV5033

Hi, can you help me with distance range in mm for DRV5033 sensor?  

  • 0
    TI__Mastermind 26660 points

    Hello Ivan,

    The distance range of the DRV5033 is really determined by how strong of a magnetic field is created by the magnetic source you want to measure. Thus, the part is not limited by distance, but by the Teslas it can sense. What is it you are trying to measure? Possibly you could use the magnetic field calculator on the DRV5033 product page, on the right side.

    Hope this helps.

    Peter Iliya

    Current Sensing Applications

  • 0 in reply to Peter Iliya
    Prodigy 30 points

    High-Pull Rare Earth Magnetic Bar, Neodymium, 1/4" Wide x 1" Long x 0.1" Thick; McMaster P# 5848K67. So is this magnet OK for sensing on distance 20mm for DRV5033AJQDBZR?

    Please confirm.

    See attached below

  • 0 in reply to Peter Iliya
    Prodigy 30 points

    or High-Pull Rare Earth Magnetic Bar, Neodymium, 1/4" Wide x 1" Long x 1/4" Thick; MCMaster P# 5848K71

  • 0 in reply to Ivan Kilovych
    TI__Mastermind 26660 points

    Hello Ivan,

    Which magnet dimensions to choose is dependent on what you really need from your system.

    As an example let us consider the magnet with 0.25in thickness and DRV5033AJ. It was calculated that B = 12.7mT at 20mm distance.

    “Distance of max-Bop” = 20.51mm

    - Correlates to the Bop_max spec (12mT maximum in datasheet).

    - This means that the DRV5033 output will go low (or “trip”) by the time the magnet is at 20.51mm distance at the very closest. It is possible that DRV5033 will trip at Bop_min = 3mT (when the magnet is 37mm away from the device).

    - Thus DRV5033 can trip at any point the magnet distance is between 37mm and 20.51mm.

    “Distance of min-Brp” = 54.77mm

    - Correlates to the Brp_min spec (1 mT minimum in datasheet)

    - This means that the DRV5033 will go high into active state (or “release”) by the time the magnet is at 54.57mm distance at the very furthest. It is possible the DRV5033 will release at Brp-max = 5mT (when magnet is 29.7mm away from device).

    - Thus DRV5033 can release at any point magnet distance is between 54.57mm and 29.7mm

    Keep in mind that whether if the DRV5033 trips or releases, the DRV5033 must sense a change of 3.4 mT (Bhyst) before it can revert to the other state.

    So in your application, if you want the magnet and DRV5033 to never get any closer to each other than 20.51mm, then this magnet and DRV5033 combination will work for you because once magnet has approached the sensor with distance of 20.51mm, the device will have tripped by this point or have already tripped at some distance in between 37mm and 20.51mm

    Sincerely,

    Peter Iliya

    Current Sensing Applications