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DRV8801A-Q1: Questions related to FMEA, short circuit between CP1 and CP2

Martin Grimmer
Prodigy 460 points
Part Number: DRV8801A-Q1

Hello,

following questions are related to DRV8801A-Q1 (ordering code DRV8801AQRMJRQ1)

  • What will happen if the capacitor at the charge pump (pins: CP1 and CP2) gets shorted?
  • Is there an internal protection in the IC for case above?
  • What will be the effect if a short circuit occurred between the pins CP1 and CP2?
  • Do we have a FMEA for the whole IC, including the charge pump pins (CP1 and CP2)?

Thanks

Best Regards

Martin Grimmer

  • 0
    Prodigy 90 points

    Hello Martin,

    Iam also looking the same related to DRV8801A-Q1. Actually my requirement is to calculate the input current during short circuit on output.

    Thank you,

    Srikanth

  • 0 in reply to srikanth k45
    TI__Guru** 114905 points
    Hi Martin,

    What will happen if the capacitor at the charge pump (pins: CP1 and CP2) gets shorted?
    Is there an internal protection in the IC for case above?
    What will be the effect if a short circuit occurred between the pins CP1 and CP2?
    Do we have a FMEA for the whole IC, including the charge pump pins (CP1 and CP2)?


    We do not have any FMEA data for whole IC, so we tested a device to determine the results.

    The device was tested at VM= 12V, 18V, and 24V. The device was subjected to shorts between CP1 and CP2 for 60 seconds at 25C in both sleep and active mode with a 2kOhm resistor across the outputs.

    The power supply current increased by ~80mA when CP1 and CP2 were shorted. The VCP output remained at approximately VM-0.7V and the nFAULT is asserted (charge pump undervoltage).

    The outputs remain enabled, but are not operating at low RDSon. This will probably cause the overtemperature to assert.

    When the short was removed, the device began operating normally and the nFAULT was de-asserted.