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DRV8402 vs DRV8432

Adriano
Prodigy 10 points
Other Parts Discussed in Thread: DRV8412

Hi,

I'm looking for a driver to my application. I have to drive a 3-5A/12V brushed motor with 12A peak (150 ms). It seems both DRV8402 and DRV8432 is enough for me. My problem is putting it in a small board, so DRV 8432 should be better, because I can use a ferrite bead (BLM21PG220SN1D) instead of an inductor. Unfortunately, the inventory of this part at ti.com seem to be ZERO .

So, can I design my board to use a 8432 and, until I don't have it, can I use a 8402 instead? Is the ferrite bead enough?

 

Thank you

 

Adriano

  • 0
    TI__Guru**** 189401 points

    Hi, Adriano,

    The inductor is primarily used for short-circuit protection. If you don't short the outputs, you should be okay with just a ferrite bead on the DRV8402.

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 40 points

    Looks like the DRV8402 is the smae silicon as used in the DRV8412/DRV8432 in siddwewnr packing (DRV8412) or higher current rating (DRV8432). Is that correct? What about parallelling AB and CD. Wouldn't two coils, one for each combined output AB and CD, work as well for short detection as four sepearate coils for A,B,C,D?

  • 0 in reply to Randy Dumse
    Prodigy 40 points

    Correction, that is "different packaging" for DRV8412 comment

  • 0 in reply to Randy Dumse
    TI__Expert 4320 points

    Randy

    The DRV8402 and DRV8432 is not the same silicon, the DRV8432 current protection scheme has been optimized for motor application.

    Main difference between the DRV8412 and the DRV8432 is the package.

    If you whant to drive a single DC motor, like shown in figure 9 on page 15 of the datasheet, we recomend to use small inductors in each output phase for current sharing purposes.

    The inductor value can be fairly small with 12 and 24V supplies, so a small ferit bead can be used

     

    rgds,

    Kim N Madsen