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DRV5013: How to get rid of Power-On Time "Pulse" Feature

Part Number: DRV5013

There is a feature when the Hall Sensor turns on it gives a pulse during t_on. Is there a way to get rid or have some kind of low pass filter to avoid this pulse?

  • Hello,

    Thank you for using the TI forum. What problem is this pulse causing you? The pulse during t_on can not be turned off, and I do not believe that filtering could fix this problem. However, based on your application, there may still be some options. If you'd like to post a schematic or share your design concept, then we can help you look into your options.
  • Hey Mitch,

    Well in our application we want our control box to see a pulse for 9 to 12ms. This additional pulse (even though it's only 50 usec) is confusing the control box since it's seeing the Hall sensor's pulse first.

    I don't think I am able to share my schematic design.

    Is there a similar sensor (around the same cost/cheaper) that does not have this feature?

    I would like to keep this Hall Sensor and change the design to get rid of the pulse, but if the pulse cannot be filter out then I have to find another solution.
  • Gee Won, we do have a new device coming out in about 3 months.

    Best regards,
    RE

  • Sorry, far out of time :(
  • Would delaying the output of the DRV until after the control box has acquired the 9-12ms pulse fix your problem? If so, the output can be delayed by either delaying DRV power up or by simply delaying the DRV output. The only difference between the two options is that if you choose the delayed power-up option the 50us pulse would still be seen by the control box, but only after the 9-12ms pulse has been acquired. Is this acceptable?
  • Doesn't work because the control box will see the pulse and then give a false trigger.

    Is there a way we could talk via email so I am able to send you my design

  • That is a good idea. I just sent you a friend request so that we can send each other private messages.
  • Hi I talked to my manager and we may consider it if this issue is not solve. Could you send me the datasheet for this new device.
  • I sent you a private message.
  • According to the offline discussion, a proposed solution was to delay powering on the Hall device until after the 9-12 msec pulse has finished.  Two delay circuits were discussed.  The first circuit delays and then has a sharp rise for powering on the device, as shown below.

    The second delay circuit was discussed to save space on the board, but does not have as fast of a rise in for powering on the device, as shown below. Also, different resistor and capacitor values will be needed based on your specific Mosfet/BJT.

    It is good to note that if space is available you could add resistors in the positions of R2 and R6 from the first design to the second design for robustness, but you should be fine without them.