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DRV8801A-Q1: nFault and overcurrent protection with Rsense

Yannick Riou64
Prodigy 60 points
Part Number: DRV8801A-Q1

Hi, 

I don't understand really well the overcurrent mechanism on the DRV8801-Q. It is said that the nFault signal is pulled low when a short is detected. But how this short is detected ? Is it with the I(trip) that we set with the Rsense resistor ?

My question is : if I set a current limit with the Rsense and if this current is exceeded in the motor, does it trigger the nFault pin ?


Thank you in advance for these explanations,


Regards,

Yannick

  • 0
    TI__Guru** 114905 points
    Hi Yannick,

    There is an internal circuit that detects high current (>2.8A or >3A depending on VBB). This circuit operates even if the SENSE pin is connected to GND.

    The sense resistor allows the user to set an overcurrent limit lower than the internal circuit. The nFAULT pin is asserted if the current across the sense resistor exceeds V(ITRIP).