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How to: DRV8843 with 2 DC Motors?

Matthias Grabowski
Other Parts Discussed in Thread: DRV8843

Hello,

I would like to drive two DC motors that each use 24 Volts an about 1 A when working. The DRV8843 seems to be applicable to this use case, correct?

When i supply 5 Volts to either xIN1 or xIN2 inputs the expected outputs at xOUT1/xOUT2 should be at 24 Volts - correct?

The problem is that my setup doesnt work. When measuring the voltage between xOUT1 and xOUT2 without the motor connected i get about 6.3 V. When connecting the motor, nothing happens. Any suggestions about what im doing wrong? Ive wired VMA, VMB, SLEEP and RESET to +24 V and the inputs xIN1/2 are wired to switchable +5V. GND is connected and CP1 and CP2 are connected to capacitors according to the datasheet. To my best knowledge it should work, but apparently i forgot something. Any help?

  • TI__Expert 7455 points

    Hi Matthias,

    The DRV8843 is an excellent device to drive 2 DC motors. What I read from your description that raised some serious concern was the connection of nSLEEP and nRESET to VM. These are logical inputs, so if you want to make them HI, they should be connected to 5V. I think at this point in time it is safe to assume the device that was subjected to these conditions has been destroyed, so you will want to continue your experiments with a fresh unit.

    Other things to consider:

    1. Make sure the AIx and BIx pins are connected to GND as this will tell the system to employ 100% current setting.

    2. What is your SENSE resistor? For DC motors, most people do not want to use current regulation in which case you can connect the SENSEA and SENSEB pins to GND.

    3. If you do have a SENSE resistor, then you will need to make sure VREFA and VREFB are something larger than 0V. If they are at GND potential, no current will flow.

    That's all I can think at the moment. Feel free to let us know whether these suggestions worked or not for your application.

    Best regards,

    Jose Quinones