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DRV5013: DRV5013ADQDBZR

Rajkumar Chaurasiya
Prodigy 140 points
Part Number: DRV5013

Tool/software:

Hi Team,

I am using DRV5013ADQDBZR hall sensor in our 18V BLDC motor. I have observed multiple hall sensor got damaged in different different motors.  Hall sensor Vcc supply voltage is 3.3V which is generated by LDO. I have used 1K Ohm pull-up resistors on the output pins from same 3.3V Vcc supply.

I am unable to identify the root cause. I have not founded any physical damage of the hall sensor. 

When I rotate the motor manually the two hall sensors output goes high (3.3V) to  low (0V) properly. But third hall sensor output goes high at 0.7V only. 

Can you please help and let me know how can we investigate.

Regards,

Raj Kumar

  • 0
    TI__Mastermind 26335 points

    Hello Raj,

    Thanks for considering to use Texas Instruments.  Im thinking that either you have some sort of short or maybe there is some sort of ESD event that are causing what you are observing. 

    For diagnosing possible short:

    Are all of the Hall sensors getting damaged at the same location? Is the potential at the damaged device VCC pin 3.3V?(without seeing your schematic, pcb, or physically assembled board I can't assume its at the LDO potential).  If you break the connection between the DRV5013 output and the downstream device (I presume either a motor driver or microcontroller), does the output start behaving as expected when moving the motor manually?If you replace the damaged device with a new one, does the device operate as expected when the motor is manually moved? 

    For diagnosing ESD issue:

    Did you install the supply bypass capacitor next to the device or is far away or not installed at all?

  • 0 in reply to Patrick Simmons
    Prodigy 140 points

    Hi Patrick,

    Are all of the Hall sensors getting damaged at the same location? No at different locations.

    Is the potential at the damaged device VCC pin 3.3V? No. After removing's the hall sensor connector 3.3V showing ok.

    If you break the connection between the DRV5013 output and the downstream device output start behaving as expected when moving the motor manually? No. We did that but ne hall sensor output not goes to high at 3.3V.

    If you replace the damaged device with a new one, does the device operate as expected when the motor is manually moved? Yes. After replacing with new it is working as expected. 

    Did you install the supply bypass capacitor next to the device or is far away or not installed at all? Only one 0.1uF capacitor on Vcc. Capacitor is not near to hall sensor. Please see in below layout image.

    Actually, When we installed our new motor in the machine. Then it was working as per expectation. But after some time, suddenly the motor stopped. Then we did debug the Interfaces PCBs and Motor. We did not find any issues in the interface PCBs. Only founded one hall sensor got damaged. After replacing with new motor machine is working.

    I have attached the schematic and layout image.

    Complete Schematic

    Hall Sensor PCB Schematic

    RU=RV=RW=1Kohm and C1=0.1uF/35V

    Hall Sensor PCB Layout

    I hope this is enough for your understanding.

    If you have any query please drop message.

    Regards,

    Raj Kumar

  • 0 in reply to Rajkumar Chaurasiya
    TI__Mastermind 26335 points

    Hello Raj,

    The supply bypass capacitors not only help provide a cleaner signal to the device, they also act as a form of protection.  I would encourage you to try dedicating a 0.1uf to each DRV5013, with each placed close to the DRV5013's supply and gnd pins.  You might be able to achieve this with your current board by scraping away some solder mask on the VCC and ground traces to expose some surface for a surface mount or possibly just solder a through hole to the DRV5013 VCC and GND pads (be sure to trim the components leads though).  In the future it might also help to have a slightly stronger GND connection (one with lower parasitic board resistance).  You could also probably add some capacitance by running the VCC on the top layer and GND directly below on the bottom layer.