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DRV8306: HNA & HNB & HNC voltage setting conditions

Chen edison
Prodigy 20 points
Part Number: DRV8306


Hello sir,

HPA & HPB & HPC EVM reference design is pull high 10k to DVDD, I no problems with this section, but I want ask HNA & HNB & HNC reference design is voltage divider 1/2 DVDD, the equivalent voltage is 1.65v. 

Is there a requirement the voltage value must be 1/2 DVDD? ,and if the voltage value is adjusted higher 1.65v or lower 1.65v, will it affect the efficiency of the motor switching phases?

Ps, For example, will it affect these GHA/GHB/GHC and GLA/GLB/GLC signal switching?

Regards,

Edison

  • 0
    TI__Mastermind 26510 points

    Hi Edison,

    Having the HNx values be tied to DVDD/2 is only recommended if using an open drain output hall sensor. For open drain hall sensors it is recommended to set HNx pins to the hall supply/2 due to the internal comparator that is used to determine the hall state. Changing the voltage divider for the HNx pins will change the voltage that the HPx pins must receive for the comparator to output a high or low value. This could lead to the DRV8306 not being able to understand the correct position of the motor.

    If the hall supply is what is changed and not the resistors used for the resistor divider, there should be no effect on the halls readings. 

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 20 points

    Hello Joshua,

    I would like to ask whether the HNx values ​​be tied to DVDD/2 for different hall sensor motors? ,there should be no effect on the halls readings, and not effect motor speed efficiency?

    I have a problem, because I have two hall sensor motors Specification, but at the same circuit parameter, the speed of one of them could not be increased, and the UVW wave pattern was measured.

    But I don't know which side causes motor to the speed could not be increased. As a result, it cannot meet the wind pressure definition in the specification.

    motor one U/V/W and hall A/B/C waveform is correct, as shown below:

    motor two U/V/W and hall A/B/C waveform is fail, as shown below:

    Regards,

    Edison

  • 0 in reply to Chen edison
    TI__Mastermind 26510 points

    Hi Chen,

    Chen edison said:
    would like to ask whether the HNx values ​​be tied to DVDD/2 for different hall sensor motors?

    If both types of hall sensors are Open Drain hall sensors then having HNx be tied to DVDD/2 for both hall sensors should not be causing issues with the hall readings or motor speed.

    For the motor that has issues speeding up, what is the duty cycle % and the Hz of the FGOUT that the motor is unable to continue past? 

    Could you also provide a capture of the GHx signals and the input PWM signal when the input PWM signal is set to 20kHz?

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 10 points

    Kind and legit topic it is for knowing the new informational services creatively, like the most decent Assignment Master is providing all over the UK these days.

  • 0 in reply to Asley Patricia
    TI__Mastermind 26510 points

    Hi Asley,

    Thank you for your comment!

    If you have any questions related to this topic please click the orange "Ask a related question" button at the top left of your screen.

    Regards,

    Joshua