DRV8662: Dual piezo drive

Yusuke Mukuno

Expert 7395 points

Part Number: DRV8662

HI Expert,

My customer is considering 2pcs piezos drive with 1pcs DRV8662, like following configuration,

Is it any problem?

If you have any advice, please let me know.

Step drive or Liner drive

From Datasheet Figure 8. Typical Waveform

Thanks

Muk

over 2 years ago

0 Carson Allen over 2 years ago

TI__Genius 13610 points

Hello,

The main potential problem is what are the combined capacitance?

May be too large device to drive

Best Regards

Carson

0 Yusuke Mukuno over 2 years ago in reply to Carson Allen

TI__Expert 7395 points

Hi Allen-san,

Piezo capacitance will be <60nF.

Is it any problem?

Thanks

Muk

0 Carson Allen over 2 years ago in reply to Yusuke Mukuno

TI__Genius 13610 points

Hello,

So your total capacitance will be ~<120nF which is okay but know you have limited Vpp depending on boost voltage and output frequency as shwon by these curves

Best Regards,

Carson

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DRV8662: Dual piezo drive