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DRV2665/DRV2667

Noriaki Fukazawa
Expert 1620 points
Other Parts Discussed in Thread: DRV2665, DRV2667, DRV8662

Hello Expert

My name is Noriaki Fukazawa.

I have a question about DRV2665 and DRV2667 .

I understand these product can be use to drive the piezo electric element.

What is driving the smallest piezo element's capacitance possible?

It is my convenience, please give me answer as soon as possivle.

Best Regars,

Fukazawa.

  • 0
    TI__Expert 8832 points
    Hello Noriaki,

    Yes those devices are piezo drivers. The minimum capacitance depends on how high the boost needs to be and the frequency desired.. Please ask a specific question and provide more detail for an answer.
    If you think the capacitance is too low to drive, then a parallel capacitor can always be added to provide stable output.

    Regards,
    Kelly Griffin
    Haptics Application Engineer
  • 0 in reply to Kelly Griffin
    Expert 1620 points
    Hello Kelly-san,

    Thank you for your reply.
    Sorry, my question was shortage .
    I will explain in detail about piezo element to use my customer.

    ① piezo capacitance = 6nF
    ②Resonance Frequency = 30KHz~100KHz
    ③Vout = 100~125V

    I think DRV2665 and DRV2667 (DRV8662)is clear ③ conditions.
    But, I don't know these products clear ①② conditions.
    Does these product clear ①② condition?

    I will wait for your reply.

    Best Regars,

    Noriaki
  • 0 in reply to Noriaki Fukazawa
    TI__Expert 8832 points
    Hi Noriaki-san,

    Our drivers can operate at this low of a capacitance. However, the frequency is above the bandwidth of the amplifier with no load. Refer to the electrical characteristics - amplifier bandwidth. With no load at 50Vpp, the max frequency is 20 kHz.
    I'm sorry to say that none of our piezo drivers can operate at this high of frequency.

    Regards,
    Kelly Griffin
  • 0 in reply to Kelly Griffin
    Expert 1620 points

    Hi, Kelly

    Thank you for your reply.

    My customer understand the relationship between the drive voltage and the amplifier bandwidth.

    This matter became close.

    Thank you for your quick answer!!

    Best,Regars.

    Noriaki