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DRV8803 PWPR application

hailong xu1
Intellectual 260 points
Other Parts Discussed in Thread: DRV8803, DRV8837, DRV8834

I'm looking for a motor controller to replace my current application of UDN2559EB, the motor is 5V drivened. I think DRV8803 would be a good choice, I'd like to get advice if it's ok. the Vcc is 8.2Vmin, in the data sheet, motor is driven by its Vcc. if I use a seperate 5V to drive motor, can I connect the 15V Zener between Vclamp and GND only.

Thanks!

please email me hxu@zoll.com or post here.

  • 0
    TI__Guru 55655 points

    Hailong,

    Have you considered using one of our low voltage drives like the DRV8837? 

     

    http://www.ti.com/lit/ds/symlink/drv8837.pdf

  • 0 in reply to Ryan Kehr
    Intellectual 260 points

    Hi Ryan,

    Good morning, thank you for your reply. I did review DRV8837, it only drive half of the stepper.

    I don't have issue to supply higher Vcc, I just wonder if have any other issues in my above mentioned application.

    Thanks again.

    Hailong Xu

    12/14/12

  • 0 in reply to hailong xu1
    TI__Guru 55655 points

    Great...than the DRV8834 is perfect for your applicaiton.

    http://www.ti.com/product/drv8834

     

     

  • 0 in reply to Ryan Kehr
    Intellectual 260 points

    Hi Ryan,

    Could you please tell me why you recommend different parts for me? from the application DRV8834 need so many components, it is not good for my exsiting application, I'm not prefer to add so many more parts in, it is a replacement application not new design.

    Thanks!

     

  • 0 in reply to hailong xu1
    TI__Expert 7455 points

    Hi Hailong,

    I think it would help us to have a little bit more information in order to provide a more definitive answer. With the information we have, all we can do is guess. Guesses are as good as guesses are.

    One question that I have is what is your application voltage power supply? This will define whether you want to use a low voltage or a mid voltage driver. DRV8834 and DRV8837 are low voltage devices. Ryan suggested them because you were talking about driving a 5V motor and these devices are excellent if that is your application voltage. BTW, you can still use DRV8837 to drive a stepper, but you will need two devices. This is no problem as the DRV8837 is super small and super cost effective. Do note that DRV8834 or DRV8837 will only apply if you are trying to drive a bipolar stepper motor.

    DRV8803 is a mid voltage driver (up to 60V) and can still drive your 5V motor if done correctly. For example, you can drive the DRV8803's VM to 12V and still drive the motor to 5V. How would we do this?

    Well, the DRV8803 is a quad low side driver which means each output is just a power FET with an open drain. What you connect to these output's drains does not need to be constricted by the 8.2V, or larger, parameter.

    I am also assuming you want to drive an unipolar stepper. In this case, you can tie your center tap to your 5V and the device's VM to 8.2V or more.

    The VCLAMP will need to be connected to VM directly or through a zener diode if you want even faster current decay. So  your 15V zener diode request is doable. When the output is disabled, the winding current will rise the voltage and enable the VCLAMP diode and the zener diode. The higher the voltage on the zener diode, the quicker the current decays.

    Hope this info helps. Best regards,

    Jose Quinones

  • 0 in reply to Jose Quinones
    Intellectual 260 points

    Hi Jose,

    Yes, First I need a quad low side driver which each output is just a power FET with an open drain; I can supply Vcc>8.2V but prefer to supply 5Vcc; second, the motor is driven by 5V, one side of the motor winding tie to 5V, other side tie to DRV8803 open drain; third, VCLAMP is clamped to 15V with a 15 zener from VCLAMP to GND.

    From what you explain, all my proposal would be ok. Thanks!

    Hailong Xu