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DRV8837C: DRV8837C RMS current

Sammi Shang
Expert 4450 points
Part Number: DRV8837C
Other Parts Discussed in Thread: DRV8837, DRV8870

Dear team,

I have not seen the RMS current for DRV8837C in datasheet. Only peak current <=1. Customer's application need 1A current last 1s. Could DRV8837C be ok for this?

Thanks.

Best regards,

Sammi

  • 0
    TI__Guru 56650 points

    Sammi,

    DRV8837C cannot predict what the load inductance is and the motor back EMF is. So, it cannot give the RMS current without know the output inductance and the motor back EMF.

    DRV8837C has 1.2A minimum OCP threshold. DRV8837 has 1.9A minimum OCP threshold. If the customer want to have 1A RMS, the peak output current has to be lower than 1.2A if they uses DRV8837C.

    What is the input voltage for this application? If the customer want to have a peak current higher than 1.2A, please check DRV8870 if the input is higher than 6.5V.

  • 0 in reply to Wang5577
    TI__Expert 4450 points

    Hi Li,

    Thanks for your response. I see from DRV8837C datasheet that the peak drive current was internally limited? So what does the internally limited mean?

    Thanks.

    Best regards,

    Sammi

  • 0 in reply to Sammi Shang
    TI__Guru 56650 points

    Sammi,

    That means customers cannot change the current limit threshold.