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DRV8434: Testing the current limit

Danilo A.
Mastermind 28730 points
Part Number: DRV8434

Hi Team,

Our customer would like to set the current limit of the device to 1A. To test the current limit, he will connect resistors to AOUT1 & AOUT2 and BOUT1 & BOUT2 such that the current is slightly above 1 Amp. Then he will connect the device to a 10V power supply. He would like to know if the current limit is exceeded does the nFault pin goes to logic low and does the AOUT1-2, and BOUT1-2 go to a high impedance state?

Regards,

Danilo

  • 0
    TI__Guru 56650 points

    Hello, Danilo,

    If the output current is lower than the OCP threshold, nFault pin doesn't go low. After the output current reaches the regulation point, high side FET is off. xOUTx status is related to the decay mode setting. I have done the current limit test before. Please see the demo waveform in the attached file.

    BTW, the resistor test can check the datasheet spec value. It is a DC value. If the output inductance is small, the actual current cut off point could be higher than the test result with a resistor at output.

    DRV84xx_Itrip DC measurement.pdf

    Regards,

    Wang Li