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DRV2665: Can DRV2665 drive Murata piezo PKM13EPYH4000-A0 (BUZZER PIEZO 30VP-P 4KHZ PC MT)?

Poh Kok Keng
Genius 5272 points
Part Number: DRV2665
Other Parts Discussed in Thread: DRV2700

Dear Sir/Madam,

In DRV2665 datasheet: It mentioned:

8.2.2.2 Piezo Actuator Selection

There are several key specifications to consider when choosing a piezo actuator for haptics, such as dimensions,

blocking force, and displacement. However, the key electrical specifications from the driver perspective are

voltage rating and capacitance.

At the maximum frequency of 500 Hz, the device is optimized to drive up to 50 nF at 200 VPP, that is the highest

voltage swing capability. It drives larger capacitances if the programmed boost voltage is lowered and/or the user

limits the input frequency range to lower frequencies (e.g. 300 Hz).

 


I have a selected Murata Piezo PKM13EPYH4000-A0 (BUZZER PIEZO 30VP-P 4KHZ PC MT)?, spec as below:

Since the datasheet mentioned the max freq is 500Hz, I am worry DRV2665 will not be able to drive this piezo to generate an audible sound or the sound might be very soft. Can any expert confirm on this?

Best Regards,

kpk

  • 0
    TI__Expert 8832 points
    Hello Poh,

    As the boost voltage decreases, the frequency bandwidth increases. For this piezo sounder, you only need the boost to be set to ~20V. At a boost voltage of 20V, you should be able to easily achieve audible frequencies up to ~4kHz or maybe higher. You can refer to figures 9-12 in the DRV2700 datasheet to reference the tradeoff between capacitance, frequency, and boost voltage. The DRV2665 will have similar characteristics.