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DRV8837: Sinusoidal output current?

Jim Perkins
Expert 3130 points
Part Number: DRV8837
Other Parts Discussed in Thread: DRV8847, DRV8850

Is it possible to achieve a sinusoidal o/p current from the DRV8837 by modulating the PWM drive?  Or would another device be more suitable (5V Vcc, 1.8A pk)?

Regards

Jim

  • 0
    TI__Guru** 114905 points

    Hi Jim,

    Yes, it possible. But the DRV8837 may not be the best device depending on the application.

    Can you provide more details on your application?

    What load are you driving?
    What is your desired PWM frequency?
    What features of the DRV8837 are desired?
    Any other information?

  • 0 in reply to Rick Duncan
    TI__Expert 3130 points

    Hi Rick

    See below:

    What load are you driving? DC Motor

    What peak current do you require? 1.2 A peak, 0.9A RMS

    What is your desired PWM frequency? 1kHz

    What features of the DRV8837 are desired? Sleep Mode

    Any other information? Limited space

    Thanks

    Jim

  • 0 in reply to Jim Perkins
    TI__Guru** 114905 points

    Hi Jim,

    Thank you for the additional information.

    Assuming the DC motor is brushed, the following devices are also possible options:

    The DRV8847 which has:

     A voltage range of 2.7 to 18V
    Ability to monitor the current by adding an opamp on the external sense resistor
    RDSon of ~500mOhm in parallel (higher than the DRV8837)

     

    The DRV8850 which has:

     A voltage range of 2 to 5.5V ( 7V abs max -- this could be an issue)
    RDSon of 65mOhm
    Ability to monitor the current using the VPROPI output
    An integrated adjustable LDO that can provide up to 100mA