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DRV2700 Flyback

SimonF
Expert 3370 points
Other Parts Discussed in Thread: DRV2700

Hi Team

could you please have a look at my questions below?

1-      We have to drive a 3.3uF 0V-150V piezo, at 15 to 20 Hz, positive sinus (or trapezoidal). Do you see a problem to achieve this with this chip and eval board ?

2-      Do you have an estimation of the heat power dissipation on this driver in this configuration ?

3-      In the case we would like to modify the reference flyback design in order to supply the current to the piezo from a 12V source instead of a 5V source, do you have a suggestion for the required modifications? Is this possible?

Best regards

SF

  • 0
    TI__Genius 10512 points
    Hi SF,

    1. If you do the math and use figure 13 in the user guide, you may be able to achieve 15Hz. The instantaneous current is 3.3uF*(150/(1/Freq)). The plot at 150V shows an instantaneous current of ~7mA. This is about 14Hz.

    2. No, you can reference figure 26 of the DRV2700 datasheet and the thermal values listed in the spec table.

    3. This is not possible. The DRV2700 architecture requires VDD = SW and the operating range is only up to 5.5V.