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DRV5023: Design Problem

Brian Wang0928
Genius 14010 points
Part Number: DRV5023

Customer's verifying the DRV5023 on the power tool application for industrial usage. The application is to design a bottom Switch with magnetic field and DRV5023. When we push the Switch bottom down(Switch ON state), the output behavior of the DRV5023 should be Low, In opposite it's Hi-Z impedance(When Switch OFF). 

However, we found something wrong on this mechanical design with DRV5023 when doing Switch off-> on -> off.

When switch Off -> ON , the output of DRV5023 is changed from Hi-z to Low

Then, switch ON -> OFF, the output of the DRV5023 is kept Low. s mechanical design with DRV5023 when doing Switch off-> on -> off.

When switch Off -> ON , the output of DRV5023 is changed from Hi-z to Low

Then, switch ON -> OFF, the output of the DRV5023 is kept Low.

In mechanical design, when Switch ON, the distance between IC and Magnet field is about 0..45mm. and when Switch OFF, the distance between IC and Magnetic field is 3.35mm.

We're wondering to know how to improve it. or any suggestion with this designs? Very thanks. 

Regards

Brian

Regards

Brian 

  • 0
    TI__Mastermind 26075 points

    Hello Brian,

    It looks to me like Brp is not being reached when moving the magnet away from the sensor.  I recommend using the "Hall Effect Switch Magnetic Field Calculator" on the device product page to help confirm your design.  You will input the size, shape, and strength of your magnet, then for each device version the calculator will show you the "Distance of max-Bop" (i.e., how close you must get the magnet to ensure the device is on with a low output), and the "Distance of min-Brp" (i.e., how far away the magnet must then get to ensure the device output is released back to a high output).