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DRV8350: DRV8350 Fault

kura
Genius 4810 points
Part Number: DRV8350

Our customer is consider to use DRV8350S.

We got request and questions about DRV8350S from them.

Please see attached and advise us.

If you need any additional information, please let us know it.DRV8350S.pptx

Regards,

  • 0
    TI__Genius 10570 points

    Hi Kura,

    Thank you for posting to the Motor Driver's forum!

    I will aim to provide feedback on the questions in the attached PPT that you have shared by the middle of next week.

    Best,

    ~Alicia

  • 0 in reply to Alicia Rosenberger
    Genius 4810 points

    Alicia-san

    Thank you for your reply.

    They are using this part in both motor mode and generator mode.

    Fail happens in only generator mode.

    Regards,

    Kura

  • 0 in reply to kura
    TI__Genius 10570 points

    Hi Kura,

    Just to provide some quick feedback, some things to consider when operating in generator mode is that when operating as a generator, the motor takes mechanical torque and converts it back to electrical energy. As a result, the motor may cause an increase in supply voltage which could in turn result in an overvoltage event.

    For more information about this and how to mitigate it, please refer to the following FAQ: [FAQ] How to *not* damage your motor drive system from overvoltage.

    Best,

    ~Alicia

  • 0 in reply to kura
    TI__Mastermind 18916 points

    Hi Kura,

    Please let us know if you require further assistance on this debug. 

    If not, please help mark thread as resolved. Thanks 

    Best Regards, 
    Andrew 

  • 0 in reply to Andrew Liu
    Genius 4810 points

    Andrew-san

    Thank you for your reply.

    My colleague has contacted Angelica-san about this matter.
    But he hasn't gotten an answer yet.

    Can you give us answer for attached 2questions.0247.DRV8350S.pptx

    regards,

    Kura

  • 0 in reply to kura
    TI__Genius 10570 points

    Hi Kura-san,

    I am currently looking into the 2 questions being asked and aim to provide a response by the end of Tuesday, next week.

    In the meantime, for question 1, you mention that a voltage across VDRAIN and GND is observed when the rotation speed is increased. Would you be able to provide a waveform showing this? 

    Best,

    ~Alicia

  • 0 in reply to Alicia Rosenberger
    Genius 4810 points

    Alicia-san

    Thank you for your reply.

    About waveform

    Please see attached file Page2. As the rotation speed increases, V_DRAIN voltage  increases.

    .We don't have actual rotation speed information.

    regards,

    Kura

  • 0 in reply to kura
    TI__Genius 10570 points

    Hi Kura-san,

    Thank you for the clarification. I will aim to provide a response by the end of Tuesday.

    Best,

    ~Alicia

  • 0 in reply to Alicia Rosenberger
    TI__Genius 10570 points

    Hi Kura-san,

    Thank you for your patience, please see my feedback below:

    Q1) When UVW is connected to 3Phase magnetic ACG and they increase the rotation speed, They see a voltage across VDRAIN－GND is this the correct behavior?

    • The voltage that they are seeing across VDRAIN-GND is expected behavior. The reason why is that when the motor is getting spun by hand, it generates Back-EMF voltage that which then gets fed into VDRAIN/VM.

    Q2) They are considering connecting the circuit shown in Fig. 2 to the circuit shown in Fig. 1 ... Is there any problem with this usage?

    • The proposed circuitry should be okay. The thing to be careful of would be ensuring that you are not slewing VDRAIN too quickly and violating the Abs Max spec'd in the datasheet as this could damage the device.

    Best,

    ~Alicia