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DRV8714-Q1: motor drive protect

Raymond He
Expert 1990 points
Part Number: DRV8714-Q1

dear 

     My customer use DRV8714-Q1,and now has three  design  questions:

1)  Is it necessary to serial risistance between DRV8714-Q1 output  port and  MOS ? In order to protect DRV8714-Q1  while huge current fee back to outout port(GH1 GL2) in extreme environments

2) Is there any protect circuit while GH1 MOS AND GL2 MOS   is on state and  motor has short？and now current has flows to GND and curcuent sensor has not work 

3）Is there DRV8714-Q1  H -bridge demo can ref？

thanks in advance

  • 0
    TI__Mastermind 45075 points

    Hi,

    Thank you for your questions.

    1. serial resistor is not MUST, but I suggest to have 0hom resistor as follows. It is common and some customer use this register to reduce rise time further if needed. This is just optional.

    2) DRV8714-Q1 has VDS over current protection. It measures VDS voltage of external FET then shut off FET if VDS voltage gets higher than programmed threshold.

    3) DRV871-Q1 EVM(Evaluation Module) can be referred. 

    www.ti.com/.../DRV8714-Q1

    Thanks,

    regards

    Shinya Morita

  • 0 in reply to Shinya Morita
    Expert 1990 points

     dear 

    thanks for your reply ，there is other question ：

    DRV8714  current detect needs to add series resistor？also suggest to have 0hom resistor？

    thanks in advance

  • 0 in reply to Raymond He
    TI__Mastermind 45075 points

    Hi,

    I am not sure what "current detect" means. If it means VDS over current protection, 0ohm resister is OK. 0 ohm resistor may need to be place to higher resister if customer need slower rise time to turn ON FET. 

    Normally rise time can be controlled by IDRIVE current, so most of case, just 0ohm is fine.

    regards

    Shinya Morita