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Choosing FETs for DRV8711

Javier Collado Gutierrez
Prodigy 10 points
Other Parts Discussed in Thread: DRV8711, DRV8843

Hello,


I'm designing a controller board for stepper motors using DRV8711 pre-driver and I'm trying fo find the cheapest way.

The controlled motors are small, consuming about 1A at 12V, so I don't need a big FET. It is possible to use one DRV8843 to drive the current to the motors instead of 8 FETs?

  • 0
    TI__Guru** 114905 points

    Hi Javier,

    Are you planning to use the DRV8711 to drive the DRV8843? The DRV8711 is designed to drive external FETs, while the DRV8843 contains integrated FETs. The output of the DRV8711 would damage the input to the DRV8843 in the configuration described.

    For your DRV8711 application, it is recommended to look at alternate FETs online. There are smaller, less expensive FETs available. A quick search can locate 2N-channel in a single package with 2A continuous current capability and > 30VDS.

    If you are looking for alternate stepper drivers to the DRV8711, there are many drivers available with integrated FETs. You can begin your search at http://www.ti.com/lsds/ti/amplifiers-linear/integrated-motor-driver-products.page