• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 31 subscribers
  • Views 685 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV8701: Driver current capacity of DRV8701

Fandy
Expert 2285 points
Part Number: DRV8701
Other Parts Discussed in Thread: DRV8412, DRV8850

Dears

In my design, Power Supply is single-Li Cell (4.2V) , because of DRV8701's VDD range is exceeds 5.9V ,so I will use one Boost IC to convert to 6V+ to power DRV8701 (VM),  but H-Bridge supply still derive from single-Li Cell (4.2V), Motor continuous current high up to 5A, 

In case where VM supplied to the DRV8701 can be different from the external H-bridge supply,IDRIVE need shorted to AVDD, this setting, the IDRIVE current is set to 25-mA source and 50-mA sink. so will this lower sink/source current could driver 5A current followed FETs normally ? and what's relation between sink/source current and load current?

  • 0
    TI__Guru** 114905 points
    Hi Fandy,

    Using the 25mA/50mA setting will reduce the rise/fall time at the gates of the FETs. The lower currents will also reduce the maximum PWM frequency.

    Please refer to section 8.2.1.2 for more information.
  • 0
    TI__Genius 14487 points
    Hi Fandy,

    As long as the device operates within the VM voltage range specified in the recommended operating conditions table in the datasheet, the IDRIVE currents should achieve their nominal values.

    There is not a relationship between IDRIVE current and load current. Large IDRIVE currents will switch the FETs faster, but once a FET is ON, the load current will be determined by the the VM voltage and the load.

    Have you considered using the DRV8850, DRV8412, or DRV8432 for your application? These are brushed-DC motor drivers with the FETs integrated. Also, I think they will more-closely match your supply voltage requirements.