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DRV8962: How to release IPROPI pin output bipolar waveform when driving a stepper?

Zoe Yang
Intellectual 2210 points
Part Number: DRV8962
Other Parts Discussed in Thread: , DRV8462

Dear team,

1.Ipropi function

When my customer evaluating DRV8962 to drive stepper, they sampled on ipropi pin based on below schematic, they could not achieve bipolar waveform as they wished by their own algorithm. 

 

In datasheet Page 24, our proposed application for stepper need to connect IPROPI1/2 together. Would this ipropi pin out put bipolar since customer did not connect these two pins at first place?

If Ipropi still could not meet bipolar application, do you have any further suggestion on this application?

2.Thermal suggestion

Customer need to put this device in an extremely small room. Need your suggestion on PCB layout. Can you please help provide DRV8962 EVM board PCB file?

  • 0
    TI__Expert 4955 points

    Hello Zoe,

    I believe this is the same issue we were discussing via email. I have sent you the files for the DRV8962EVM privately as they have not yet released in TI.com. I am still tracking the IPROPI bipolar waveform generation issue. I will update both here and via email. 


    Best,


    Pedro Arango Ramirez

  • 0
    TI__Expert 4955 points

    Hello Zoe,

    I have sent another email, I am copying here as well:

    After reviewing the board in the lab and looking further into the presentation I wanted to offer DRV8462 as a probable better solution for this application. I believe that it’s features would be much better suited to drive a stepper driver with proper current regulation and being addressable by SPI. This way we can avoid external shunt resistors. Additionally, this device has a programmable custom micro stepping waveform

    Example:

    Would this be a possibility for their application?

  • 0 in reply to Pedro Arango Ramirez
    TI__Guru 55555 points

    Zoe,

    Need to understand why DRV8462 would not be a good device for this application.

    I am closing this on the forum for now.

    Regards,

    Ryan