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DRV8662EVM: Input PWM with high frequency

karun joseph
Prodigy 20 points
Part Number: DRV8662EVM
Other Parts Discussed in Thread: DRV8662

Hello, I was wondering if an input PWM with high frequency (30-40k) can be used to drive the haptic driver. From the technical doc, it is recommended to use a low pass filter before a PWM can be used which would limit it to only low frequency applications. Thanks for your help!

Karun

  • 0
    TI__Prodigy 590 points

    Hello Karun,

    welcome to E2E Forum and thank you for posting your question!

    If you take a look in the data sheet of the device DRV8662, you will find this table on the page 5:

    Here you can see that the op amp inside of the device has a bandwidth limitation, depending on the voltage/gain you are operating with.

    Theoretically, you could use this device with higher frequencies, but then your voltage gain will go down and, eventually, become unity.

    Best regards,

    Marko

  • 0 in reply to Marko Grdakovic
    Prodigy 20 points

    Thanks Marco for clearing that!

    Do you recommed other piezo drivers from TI, suitable for higher frequencies?

  • 0 in reply to karun joseph
    TI__Prodigy 590 points
    Hey Karun,

    Unfortunately, at the moment we do not have piezo drivers that would be suitable for higher frequencies. We have some new devices on our road map, but I am not sure if those will be more suitable for higher frequencies.

    Best regards,
    Marko