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12 V to the output bridges

Art Wagner
Prodigy 160 points
Other Parts Discussed in Thread: DRV8312, CONTROLSUITE

Hi:

I have BDCMs from a HDD rated at 12 V. The GRV8312-C2-kit comes with a 24V power supply. How can I apply 12 volts to the output bridges?

I'm sure the answer is simple, but I don't want to make another mistake. I have burned out two of the 12 V rated motors because I used the 24V supply.

Regards,

Art Wagner

  • 0
    TI__Guru 55605 points

    Art,

    Two things you want to do for 12V operation:

     

    1) Place the shunt on JP1 over the "+12V" position.  It should be currently over the "VR1" position.  Then, apply 12V and GND to the stakes just above the JP1 header.  This will supply 12V to the gate drive of the DRV8312 and bypass the VR1 buck regulator on the EVM.  

    2)  Apply the same +12V to the screw down terminal connector right next to the J9 jack where the silkscreen shows "PVDDIN".  That will supply 12V to the power MOSFETs in the DRV8312.

     

     

  • 0 in reply to Ryan Kehr
    Prodigy 160 points

    Ryan,

    Thanks for the reply. I have done what you said and the motor (the one supplied with the kit) does not spin. An exception is the fact that my "12V supply" reads as follows. Between the screw down pin PVDD and GND I measure 10.44 V and on the GUI at the bottom of the window I read 10.83 V. I am using a power supply from a PC, so it is not adjustable. Are these voltages out of range for proper operation? I do not have the 24V supply connected.

    A second question: the GUI shows a maximum speed of 3000 rpm on the little speed dial. How does one go about running the motor faster? I would like to be able to run another motor to about 25000 rpm.

    Regards,

    Art Wagner

  • 0 in reply to Art Wagner
    TI__Guru 55605 points

    Art,

     

    Do you have 12V applied in 2 places?  You need to connect it at the PVDD screw-down terminals and also at the "AUX-12V" post at the top center of the board (just above JP1 which you should have in the +12V position).  If you don't have it applied in both places, the device will not function.

    The GUI is designed to work with the motor included in the kit which is only rated for 4000RPM.  For faster operation, you will need to build code that is optimized for your motor at at higher speed.  As a starting point, all the existing code is available on ControlSUITE that is downloadable from the TI website.  There is also a detailed user manual that describes the different build levels and provides a step-by-step method for building your own code.