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DRV8412: Schematic Review Request for driving a thermoelectric heater/cooler (Peltier)

Derek
Mastermind 9772 points
Part Number: DRV8412
Other Parts Discussed in Thread: DRV8962, DRV8952, DRV8262

Hello,

   I have an application where I need to drive a thermoelectric cooler, both for heating and cooling. 24V nominal. Current is 4.5A typ, 5.4A maximum. I will be driving it with PWM, frequency TBD but probably as high as the DRV8412 can go (500kHz) to minimize output filtering.

   Also in this design is high level current sensing using an INA180A2.Thermoelectric.pdf

Thanks,

Derek

  • +1
    TI__Mastermind 23260 points

    Hey Derek,

    Schematic all looks good! My only comment would be to make sure you have enough bulk capacitance on the PVDD line for your load, I'm only seeing 2x 47uF which might be enough, but keep that in mind for the future if you have some issues when troubleshooting your board.  

    You might also want to look at [FAQ] What are the best alternate devices for DRV8432?.  I suggest looking into the DRV8962, its current capabilities will give you far more cushion than the DRV8412 does, and the datasheet provides a lot of guidance in using the device for a TEC application.  

    Regards,

    Jacob

  • 0 in reply to Jacob Thompson
    Mastermind 9772 points

    Thanks; I will increase the bulk capacitance. I looked at the DRV8962, DRV8952, and DRV8262, but could not find any stock of any of them. If there's one thing we've learned from the chip shortage is that designing in a part that has no stock will result in much sadness and gnashing of teeth. Hence why I chose the DRV8412, because we could buy it somewhere.

  • 0 in reply to Derek
    TI__Mastermind 23260 points

    Yeah that's fair, they are all very new parts and we are working on building up inventory in them, should be fixed in the near future.  But I full understand, the DRV8412 should work for you with proper PCB layout.  Check out Best Practices for Board Layout of Motor Drivers  and PowerPAD (TM) Made Easy

    Cheers,

    Jacob