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DRV8874EVM: DRV8874EVM: Measuring the output current via IPROPI pin

Rollo_Tomasi
Prodigy 10 points
Part Number: DRV8874EVM
Other Parts Discussed in Thread: DRV8874

Tool/software:

Hi,

I connected a motor to OUT1 on the DRV8874EVM and am operating it in PMODE = logic low. I can control the motor as desired using the EN/IN1 PWM potentiometer.

The evaluation board is supplied with a 12V power source via a laboratory power supply. The power supply indicates that 1A of current is flowing.

But now I would like to use the current measurement function of the evaluation board, which is why I measured the voltage between the IPROPI pin and GND. Unfortunately, this voltage is 0V.

The setup can be seen in the following picture.

What am I doing wrong and how can I measure the output current using the on-board components?

Thank you very much.

  • +1
    TI__Mastermind 27320 points

    Hello Rollo,

    The DRV8874's IPROPI senses the current through the low side MOSFETS. When the motor is in a low side load configuration, connected between phase and GND. The IPROPI pin cannot sense the motor current since no current will flow through the low side MOSFET of the OUT half-bridge. To be able to sense the motor current the motor would either need to be connected between both of the OUT pins or be in a high side load configuration (connected between OUT and VM).

    Regards,

    Joshua