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DRV8912-Q1: Short to bat/CND test

Chuqiang Wen
Expert 4860 points
Part Number: DRV8912-Q1

Hi Expert, 

Please support to check below for DRV8912/8904 full motor driver whether can meet below short circuit testing:

  • Short circuit testing for 28V/1min during LS active
  • Short circuit testing for GND/1min during HS active
  • Short circuit testing for 28V/1min during HS active
  • Short circuit testing for 28V/1min during HS/LS inactive

Any unclear information let me know. Thanks in advance.

Thanks!

Ethan Wen

  • 0
    TI__Guru 54695 points

    Ethan,

    For the first 2 cases, the device will go into over-current protection (OCP) when the short is applied.

    For the last 2 cases, no OCP reporting will occur as there is no strong current path since short is either to the same supply voltage (case 3) or short occurs on an output that is in the high impedance case.

    Regards,

    Ryan

  • 0 in reply to Ryan Kehr
    TI__Expert 4860 points

    Hi Ryan, 

    For the last 2 cases, supply voltage VM of 8912 is 12V, but the short circuit testing is up to 28V. May you double check if there is no risk for that? 

    The use-case here is customer would like to use 8912 in commercial vehicle application. The battery voltage is 24V, but they generate 12V from DCDC to supply the VM. 

    Thanks!

    Ethan Wen

  • 0 in reply to Chuqiang Wen
    TI__Guru 54695 points

    Ethan,

    In both of the last 2 cases, current will flow thru the body diodes of the FET during the short.  This will "pump" up the supply.  As long as the voltage does not exceed our abs. max. voltage spec, device will survive.  

    By the way, load dump spec for auto is 60V.  If short happens during load dump, our device will be damaged.  I have never seen a commercial application use a 40V rated part in the application for this reason.  It is a high risk.

    Regards,

    Ryan