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DRV104: DRV104 Design and Layout Suggestions

Bryan Olinger
Prodigy 70 points
Part Number: DRV104
Other Parts Discussed in Thread: TCA9554A

No one on our small team has little to no experience with motor/solenoid control layout, so we are looking for some suggestions/examples on best way to layout our DRV104-based board.

Our design requires control of two separate solenoids that control locking mechanisms.   Each is controlled by a small board with a single DRV104 on it.  These solenoids pull 600ma before the DRV104 starts to pwm @ 60KHz and the current drops to 200ma.   The design has a single cable that brings 12VDC, Ground, I2C clock, and I2C data to each board.   The I2C bus goes to a GPIO port expansion device (TI TCA9554A) to control/monitor the DRV104.   We have shielded cables on all the lines, but still see more noise in the system that we would like when the PWM kicks in.

The DRV104 does not give any suggestions for layout/design other than the PCB footprint.   Our layout guy currently has the top layer as signals with a ground pour (I have attached a screenshot of the gerber), the second layer is split between a 3.3V and 12v plane and the third/fourth layer are ground planes (which seems to be overkill).

Does anyone have an example layout or suggestions for a DRV104?

It seems with proper layout that this could be done in a two layer board?  Correct?

  • 0
    TI__Genius 16390 points

    Hi Bryan,

    This is an old part and we have limited resources on supporting this. Yes two layer PCB is possible, but four layer would be better in terms of protecting signal integrities. All the high frequency PWM signals can be protected by ground layers.

    Also a general rule is to place the filter caps (input and output) close to the device for better filtering. Also thermal vias at powerpad is desired to help with thermal dissipation.

    Please let us know if you have additional questions.

    Regards,

    Yichi

  • 0 in reply to Yichi Zhang.
    Prodigy 70 points

    Old is OK as long as it is going to be continued to be manufactured.   I do not see a "not recommended for new designs" notice on the DRV104 web page.  Who do I contact to confirm?

  • +1 in reply to Bryan Olinger
    TI__Genius 16390 points

    Hi Bryan,

    This is old in terms of we don't have evaluation module and more technical documents associate with it. It should be ok to use and continued to be manufactured. I recommend you to contact the local sales office to get more info.

    Regards,

    Yichi