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DRV8662 High output voltage problem

This question has suggested answer(s)
MYO MIN TUN
Posted by MYO MIN TUN
on Jan 28 2012 23:45 PM
Prodigy20 points

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?

Thank you very much
Best Regards,
Min Tun
Biomedical Engineering Student
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  • Brian Burk
    Posted by Brian Burk
    on Jan 30 2012 09:22 AM
    Suggested Answer
    Expert6535 points

    Min, 

    Thanks for your inquiry.  Three settings need to be adjusted on the DRV8662 to ensure that the output voltage is set correctly. 

    1. Set the GAIN pins to the appropriate binary values.
    2. Set the boost feedback voltage so that the maximum output voltage is large enough for the gain setting set above. 
    3. Set the current limit resistor (Rlim) to the maximum Isat current of the inductor.  
    If you do not have the DRV8662 Datasheet and Evaluation Module user's guide please request it at the link below. 
    https://focus-webapps.ti.com/general/docs/event/accesseventaction.tsp?actionId=1106&profileConfirmed=true&visitedFlag=1&cmd=page&pollid=REGISTRATIONS!drv8662evm2
    Thanks
    Brian

    Brian P. Burk

    Analog Applications Engineer

    Dallas, TX USA

    DRV8662
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