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DRV3245Q-Q1: DRV3245Q-Q1

long yang
Prodigy 20 points
Part Number: DRV3245Q-Q1

In the datasheet 8.3.5.5 it  describle"The DRV3245Q-Q1 contains integrated three-phase comparators, each of which monitors the motor phasebbvoltage at the SHx pin against the supply voltage at the VDRAIN pin. Each comparator is switching at 75% and 25%, or 50% of the VDRAIN voltage." I have confused. I want to ask how does  the DRV3245CQPHPRQ1 internal module " Phase Comparators " works? Could you provide some relevant examples or calculation design documents for reference?

  • 0
    TI__Mastermind 18981 points

    Hi Long Yang,

    Thanks for posting your question to the e2e forum - 

    1. First, I have a quick question: What is your company name, and have they signed an NDA with TI?
      1. this DRV3245Q-Q1 device is meant for functional safety purposes, and we have to have an NDA signed before we can continue the discussion on any specifics

    2. On the second topic of finding some relevant examples/calculations - let me take some time to discuss with the team on what kind of documentation we have prepared for this. 
      1. in brief summary, a phase comparator will just help your system monitor the SHx motor outputs by comparing it to the GND voltage (0V) or the full motor voltage (Vdrain) to identify what state the motor phase is currently in (either pulled high, or pulled low). Those 75%, 25%, 50% might be the threshold values to be considered a high or a low, for example. 

    Best Regards,
    Andrew

  • 0
    TI__Mastermind 18981 points

    Hi Long Yang,

    Just following up on this e2e thread - did the below response help answer your question?

    Please let us know if additional help/clarification is needed

    Thanks and Best Regards,
    Andrew

  • 0
    Prodigy 20 points

    Hi ，

                            My company name is HME(HASCO MAGNA ELECTRIC DRIVE SYSTEM CO., LTD.).At present we have not signed an NDA with TI.But my colleague is communicating about it

  • 0 in reply to long yang
    TI__Mastermind 18981 points

    Hi Long Yang,

    Thanks for the quick response, and understood on the NDA situation - please do keep us updated if there's any help needed from us on this. 

    For the initial answer I gave (reposted here), it should be accurate to answering your question -> let me know if this explanation helps clarify the behavior mentioned in the datasheet. 

    1. in brief summary, a phase comparator will just help your system monitor the SHx motor outputs by comparing it to the GND voltage (0V) or the full motor voltage (Vdrain) to identify what state the motor phase is currently in (either pulled high, or pulled low). Those 75%, 25%, 50% might be the threshold values to be considered a high or a low, for example. 

    Best Regards,
    Andrew

  • 0 in reply to long yang
    TI__Mastermind 18981 points

    Hi Long Yang,

    Closing this thread for now - please let us know if you would like additional support/clarification on this 

    Best Regards,
    Andrew