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DRV8838: Alternative motor driver from TI?

David__
Genius 3585 points
Part Number: DRV8838
Other Parts Discussed in Thread: DRV8871, DIP-ADAPTER-EVM

Hi, I used the DRV8838 from Pololu to control a DC motor.

https://www.pololu.com/product/2990/specs

I'm looking for an H-Bridge driver to control a DC motor. The DRV8838 supports up to 7V.

Either single/dual output is fine.

Whereas I need to connect 35V into the Vcc and the maximum current output is 1A.

My PWM signals from the microcontroller  (MSP432) will use a signal with 100~10,000 Hz.

Simply, I cannot find an H-Bridge motor with high voltage support. It would be great if the package can be populated on the breadboard without converting.

Can you help me with this, please?

  • 0
    TI__Expert 8985 points
    Hi David,

    I will look further into this point.

    Just a clarification, is it a design restriction if the IC we recommend is of a different (larger) package or a larger pin count than the DRV8838?

    Any other restrictions like cost?
  • 0 in reply to Hector Hernandez Luque
    Genius 3585 points
    Thanks, Hector.

    Since I'm creating a prototype using a breadboard and a perfboard, the size of the IC doesn't matter.
    I think adding a big heatsink like this
    www.mouser.com/.../530002B02500G
    might be needed to use high voltage ICs. Although this will make everything bigger, it is acceptable.

    It would be preferrable to use DIP packages to hook them to the breadboard, right away.
    I do have SOIC adapters, but I will say no to Ball grid types.

    This prototype will be used in room temperature mostly.

    About cost; the cheaper the better. If the unit price (before tax) is less than $5, when I'm purchasing less than 10 units, it is fine.

    Just a reminder;
    I want to make my MSP432's PWM signals to become 35V PWM signals by using the H-Bridge IC from TI.
    My PWM signals from the microcontroller (MSP432) will use a signal with 100~10,000 Hz.
  • 0 in reply to David__
    TI__Expert 8985 points

    Hi David,

    We have two HSOP, 8 pin package devices that operate over that voltage: DRV8870 and DRV8871. If you use current regulation then DRV8871 saves a sense resistor with Integrated Current Sensing. Both meet your cost restriction.

    A third option, in an HTSSOP, 16 pin package, is the DRV8876. It's max operating voltage is exactly 37V.

    Please look at the first page of the datasheets to understand the features of these ICs.

  • 0 in reply to Hector Hernandez Luque
    Genius 3585 points

    Thanks, Hector!

    Hector Hernandez Luque said:
    If you use current regulation then DRV8871 saves a sense resistor with Integrated Current Sensing. Both meet your cost restriction.

    I really appreciate your help! I think I will choose DRV8871DDAR.

    One last thing;

    I think I have to buy an adapter board for DRV8871DDAR.

    - Is soldering the thermal pad compulsory when connecting 35V to VM power supply?

    - Does TI also sell an adapter board for this IC? Since the datasheet says

    "Thermal pad - Connect to board ground. For good thermal dissipation, use large ground planes on multiple layers, and multiple nearby vias connecting those planes."

    I don't have adapter boards that have a thermal pad which is connected to GND. Since I'm creating a prototype, these are my concerns.

    How about buying DIP-ADAPTER-EVM? Hope this can help me solder this motor driver.

    http://www.ti.com/tool/DIP-ADAPTER-EVM

    https://www.digikey.com/product-detail/en/texas-instruments/DIP-ADAPTER-EVM/296-35646-ND/3878782

    Can you help me with this? After that, I'll close this thread.

  • 0 in reply to David__
    TI__Expert 8985 points

    Hi David,

    - Is soldering the thermal pad compulsory when connecting 35V to VM power supply?

    Yes, it is. We recommend this pad is soldered to the board ground.

    - Does TI also sell an adapter board for this IC?

    We do not sell an adapter board but rather the evaluation board DRV8871EVM.

    You can also search for "DRV8871 carrier" on a web search engine and find something that may fit your evaluation needs.

    - How about buying DIP-ADAPTER-EVM? Hope this can help me solder this motor driver.

    Without the thermal pad's soldering pad being on those PCBs it is a hard sell for me to recommend them to you.