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OPA462: Series connection circuit

Hiroaki Yuyama TED
Expert 1810 points

Part Number: OPA462
Other Parts Discussed in Thread: OPA596, OPA2596

Tool/software:

Dear OP-AMP Support Team,

For example, is it possible to double the output amplitude by connecting a high-voltage op amp such as the OPA462 in series?

An example of a current amplification circuit with an output connected in parallel is provided.
I am considering whether it is possible to create a 300V 400kHz or 800kHz MEMS driver circuit using an op amp.

Best Regards,
Hiroaki Yuyama
  • 0
    TI__Guru* 77501 points

    Hi Hiroaki-san,

    Hiroaki Yuyama TED said:
    is it possible to double the output amplitude by connecting a high-voltage op amp such as the OPA462 in series?

    It is not clear how you are going to connect OPA462 in series to double the voltage. 

    Hiroaki Yuyama TED said:
    I am considering whether it is possible to create a 300V 400kHz or 800kHz MEMS driver circuit using an op amp.

    To double the op amp's driving voltage, you may do in the following two topologies. 

    1.  configure op amp in bootstrap supply‐rail driver technique

    https://www.ti.com/lit/an/sboa510/sboa510.pdf

    2. the following method is using push-pull driving topology to double the output voltage swing. In this example, I create the MEMS/PZT driver with OPA596. You need to configure your application with OPA462 instead. 

    PZT 100Vpp Driver OPA596 09122025.TSC

    If you have other questions, please let us know. 

    Best,

    Raymond

  • 0 in reply to Raymond Zhang1
    Expert 1810 points

    Hello Raymond-san,

    Thank you for your reply and advice.

    I would like to refer to your application note, configure op amp in bootstrap supply‐rail driver technique,
     and a MEMS driver circuit using the OPA596 for advice.

    We are a Disty of TI in Japan, but we also have a contract development department for customers.
    You may have another question about MEMS drivers.

    Thanks and Best Regards,
    Hiroaki Yuyama

  • 0 in reply to Hiroaki Yuyama TED
    TI__Guru* 77501 points

    Hi Hiroaki-san,

    Hiroaki Yuyama TED said:
    I am considering whether it is possible to create a 300V 400kHz or 800kHz MEMS driver circuit using an op amp.

    To drive 300Vpp, you may need two of OPA462 HV op amps to drive MEMS actuators --> the similar driving push-pull driving topology as in OPA596/OPA2596. 

    Most of MEMS actuators do not require to drive large level of current, so OPA462 should work generally. Do you have the equivalent PZT Spice model. 

    The following image is a typical PZT/MEMS equivalent Spice model. If you have these figures, we can simulate the driver. 

    Hiroaki Yuyama TED said:
    I would like to refer to your application note, configure op amp in bootstrap supply‐rail driver technique,
     and a MEMS driver circuit using the OPA596 for advice.

    It is not clear what you are referring to here. OPA462 is rated at 180Vdc in a single supply rail. To achieve 300Vpp output swing at 300kHz, 400kHz or 800kHz, you would require to have a single supply rail that is greater than 150Vdc + OPA462's headroom to accomplish this (e.g., 160Vdc single supply rail).  

    If you have other questions, please let us know. 

    Best,

    Raymond