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DRV8814: Pin-to pin compatible device to DRV8814 with brake mode

Danilo A.
Mastermind 28650 points
Part Number: DRV8814
Other Parts Discussed in Thread: DRV8812, , DRV8841, DRV8843

Hi Team,

Our customer noticed that the braking feature of DRV8812 is not as fast as that of DRV8814. Please see the details of his inquiry below.

So I'm working on a project that uses the DRV8812 and DRV8814 interchangeably, so if there is a supply issue with one component, the other can be used. We're noticing that with the DRV8812, the breaking isn't as quick compared to the DRV8814, since our motor is running past the "stop point" with the DRV8812, which is giving us some issues. On the PCB, the decay pin is pulled to GND, so we're expecting to be running in the Slow Decay mode (which should be for motor breaking)

The board is the same. The PCB is meant to support the DRV8812 and DRV8814 since from the datasheet, they are pretty much the same IC. One is just capable of driving more current

I understand from the E2E thread below that the DRV8814 has brake mode. Our customer is looking for a pin-to-pin compatible device to DRV8814 with brake mode. Can you please confirm if the DRV8841 and DRV8843 fit his requirements?

https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1101773/drv8812-drv8812-brake-function

Regards,

Danilo

  • 0
    TI__Mastermind 37683 points

    Hello Danilo,

    Thank you for posting to the MD forum.

    Can you clarify a few things:

    • What do you mean by DRV8812 is not stopping faster than DRV8814? You mean the motor is taking longer to come to a full stop? You want the motor to come to complete stop faster? 
    • Is the question asking for a driver recommendation that is capable of braking a motor in a similar to the DRV8812? 

    Regards,

    Pablo Armet

  • 0 in reply to Pablo Armet
    TI__Mastermind 28650 points

    Hi Pablo,

    Thank you for your response. Please see the answers below.

    Pablo: What do you mean by DRV8812 is not stopping faster than DRV8814?
    Ans: The customer built a board for DRV8812 and DRV8814. Using DRV8814, the motor brakes faster compared with DRV8812

    Pablo:You mean the motor is taking longer to come to a full stop?
    Ans: Yes, using DRV8812 takes longer to stop the motor.

    Pablo:You want the motor to come to complete stop faster?
    Ans: Yes 

    Pablo: Is the question asking for a driver recommendation that is capable of braking a motor in a similar to the DRV8812? 
    Ans: No, our customer is looking for a motor driver that can brake the motor faster like DRV8814

    Regards,

    Danilo

  • 0 in reply to Danilo A.
    TI__Mastermind 37683 points

    Hi Danilo,

    Has the customer measured how much of a difference in stopping time is there between the two drivers? I'm curious as too how much longer the motor is taking to come to a stop. 

    Regards,

    Pablo Armet