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DRV8410: Question about inrush current

Chase Jeong
Mastermind 6570 points
Part Number: DRV8410
Other Parts Discussed in Thread: DRV8213

Dear TI experts,

My customer tests DRV8410 for their new product. and they have a question about inrush current.

first they power power up DRV8410 and if motor is moved, I can see inrush current and battery voltage is dropped. Please see the waveform below.

they also tested MAX22201 (ADI), they did not see inrush current because MAX22201 can control the limit of inrush current.

1. Is it normal operation for DRV8410?

2. If so, can we fix it by schematic modification?

3. if we cannot fix it, please recommend other motor driver which don't have inrush current problem.

Best regards,

Chase

  • 0
    TI__Genius 16960 points

    Hi Chase,

    The device implements current regulation by comparing an internal reference voltage to the voltage on the xISEN pins, which is proportional to motor current through an external sense resistor. The ability to limit current can significantly reduce large currents during motor startup and stall conditions.

    The DRV8410 also offers a fixed blanking time (tBLANK) of 1.8 us, in which the motor driver will ignore the inrush current so not to trip the IOCP threshold. 

    The DRV8213 could be a good choice due to its adjustable blanking time, Tinrush and also offers stall detection. 

    Best,

    David