I am a Singapore local Polytechnic student and I need to generate bending effect of piezoelectric materials to complete my final year project.I have some problems with Gain Control for DRV8662, I have set Gain1 to high and Gaion0 to low manually,without connecting any resistors then I used 3.3uH for my inductor and I have successfully generate high voltage to drive the piezoelectric actuactor, but my output voltage can only reach 54 Voltage. I suspect bcoz of the gain that's why the differential amplifier could not amplifer the boost voltage of 54 V into 100 voltage. Could you please guide me how I should connect the two Gain Control pins in the IC and how Could I generate 100 voltage to let the piezoelectric bender to generate a strong bending effect? My final year project due date is next monday so could you please help me?
Thanks for your inquiry. Three settings need to be adjusted on the DRV8662 to ensure that the output voltage is set correctly.
Brian P. Burk
Analog Applications Engineer
Dallas, TX USA
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