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DRV5012: Coupling capacitor for DRV5012

Sayali Shinde
Intellectual 705 points
Part Number: DRV5012

Hello Team,

     We are using DRV5012 hall sensor on commutation PCB of BLDC motor, we required 3 hall sensor. As per datasheet it is recommended to use capacitor of 0.01uF between VCC and Ground,

Is it ok is use single capacitor for 3 hall sensor or we need to use 3 capacitor for each sensor.

instead of 3 capacitor can we increase value of it to 0.033uF

Regards,

Sayali

  • 0
    TI__Prodigy 281 points

    Hi Sayali, 

    Thank you for posting on the sensors forum. The recommendation is to use 1 capacitor per device to reduce the noise on the supply to the device. However, if your supply to the device has very low noise, you may be able to use a single capacitor for all 3 devices. Some motor systems tend to have a large amount of noise. So it may be best to use 1 capacitor for each device.

    Warm Regards, 

    Celeste

  • 0 in reply to Celeste Waters
    Intellectual 705 points

    Hello Celeste,

      Thank you for input, we have one more query regarding gap between hall sensor and magnet.

    what is maximum gap we need to maintain between hall sensor and magnet. Is it ok to have 2.5mm gap.

    at 2.5mm we have magnetic filed of 0.46mT

    Regards,

    Sayali

  • 0 in reply to Sayali Shinde
    TI__Expert 7950 points

    Hi Sayali,

    For air gap and magnetic field strength, you'll want to keep in mind the Brp and Bop specs from the DRV5012 datasheet. Typically for worst-case configuration, you want to consider Bop max and Brp min, which would be 3.3 mT and -3.3 mT respectively, to ensure you get a magnetic response like the one shown in Figure 9.

    I recommend taking a look at our TI Magnetic Sense Simulator (TIMSS), where you can select the desired motion, magnet, and sensor and run a simulation to see the expected device output in your case: https://webench.ti.com/timss/ 

    Best regards,

    Jesse