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DRV8850: 4x IN DRV8850 vs 2x IN DRV8870

Gary Zeng
Prodigy 350 points
Part Number: DRV8850
Other Parts Discussed in Thread: DRV8870,

Hi Ti experts,

  • Why does DRV8850 have 4x input pin to control H bridge. Correspondingly, the DRV8870 has only 2x input. 
  • What are the application scenarios of the four inputs.
  • In DRV8850 datasheet as below, We can see that DRV8850 has one more High-side slow mode compared with DRV8870. Is this mode have more advantages compared with low-side slow mode.

  • +1
    TI__Mastermind 37683 points

    Hello Gary,

    Gary Zeng said:
    Why does DRV8850 have 4x input pin to control H bridge. Correspondingly, the DRV8870 has only 2x input. 

    the 4 pin interface allows each FET to be controlled by an input. It also allows for more flexibility when controlling the half-bridges. The DRV8850 can recirculate current at the high side FETs.

    Gary Zeng said:
    What are the application scenarios of the four inputs.

    One scenario is driving two loads in either low-side or high-side configuration (one terminal connected to output of driver and the other terminal to either GND or VM). This type of control is not possible with the DRV8870.

    Gary Zeng said:
    In DRV8850 datasheet as below, We can see that DRV8850 has one more High-side slow mode compared with DRV8870. Is this mode have more advantages compared with low-side slow mode.

    There may be some cases in which high-side recirculation is preferred but it is application depended. Generally, there are no major differences between low side and high side recirculation. 

    Regards,

    Pablo Armet