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Original question:

DRV2700EVM-HV500: Reducing >1 kHz noise on piezo driver output (HD-PAF1419)

DRV2700EVM-HV500: Maximum Current Rating

Muneeb Ahmad
Prodigy 40 points

Part Number: DRV2700EVM-HV500
Other Parts Discussed in Thread: DRV2700

I am driving a piezo actuator  HD-PAF1419 on 212 using DRV2700EVM-HV500. I wan to know what maximum current amplifier can produce whike operating on 212V. According to graph between maximum output voltage and load current in section 6.1, if we are driving the piezo actuator at approximately 212 V, the maximum output current appears to be around 5 mA. Am I interpreting right? I wanted to confirm maximum current deliver by amplifier on 212V. Also, is there any experiemnt that I acan perform to measure it.

Kindly help me that.

  • 0
    TI__Genius 11152 points

    Hi,

    That current rating sounds correct. This part is capable of ~1W of output power, which aligns with the 212V*0.005A. As you increase the load further, you will see the boost voltage droop and eventually collapse. Or the part may thermally shutdown - but I think this is less likely in the HV500 setup. 

    I'm unsure if you need exactly 212Vpp, but the DRV2700 alone can provide 200Vpp without the flyback configuration - cheaper setup. Let us know if you have more questions. 

  • 0 in reply to Kelly Griffin
    Prodigy 40 points

    Thank you,  . I really appreciate your support. I am developing a device to provide stimulation to a sleeping person's finger. I just want to make sure that the current rating provided by  DRV2700EVM-HV500 remains in safe ranges. I am thinking about attaching some variable load to the output and measuring the maximum current supplied by device. Do you have any idea what load I can attach to perform this test?

  • 0 in reply to Muneeb Ahmad
    TI__Genius 11152 points

    Interesting application! Yes, it is tricky dealing with high voltage and haptics. I think for your test, you can use a variable resistor in the appropriate range for the voltage you are driving.. So if the peak is ~105V, look for something in the 40kΩ to 10kΩ range (2.5mA to 10mA). Power will be low still <1W rating needed. 

  • 0 in reply to Kelly Griffin
    Prodigy 40 points

     Thank you,  for your help/. I will try it in the next few days and share my results.