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OPA455: OPA455 Slew rate

zhang ping
Genius 3835 points
Part Number: OPA455


OPA455 Slew rate  min data is?We  need 30KV/us ，Can opa455 meet the requirements? Is there any other high voltage operational amplifier to meet the demand? 

 

  • 0
    TI__Guru* 77541 points

    Hi Zhang Ping,

    Can opa455 meet the requirements?

    32V/usc is equivalent 32 MV/sec.  Is 30KV/us a typo? OPA455's max. slew is rated at 32V/usec. 

    We also have OPA462 , which it has similar slew rate rating. Based on the 30kV/us requirements, we do not have comparable part to meet your slew rate requirement.  

     

    Can you provide us your application requirements?

    1. What is BW of the op amp or application?

    2. What type of analog signal are you driving, sine, squarewave or others?

    3. What amplitude of signal are you driving?

    5. What are power requirements?

    I did a quick search in our high speed op amplifier selection, I only see a slew rate up to 6600V/usec, and it is not high voltage part. 

    https://www.ti.com/amplifier-circuit/op-amps/high-speed/overview.html?keyMatch=HIGH%20SPEED%20OP%20AMP%20SELECTION&tisearch=search-everything

    Best,

    Raymond

  • 0 in reply to Raymond Zhang1
    Guru 48395 points

    Yes, 30V/nsec is hard to come by. I don't know of anything at any supply voltage, much less 150V total. 

  • 0 in reply to Michael Steffes
    Genius 3835 points

    I mistakenly wrote 32V / us, I want to know the specific minimum swing rate 。

  • 0 in reply to zhang ping
    TI__Guru* 77541 points

    Hi Zhang Ping,

    You stated an op amp with supply voltage from +/-6V to +/-75Vdc in dual rails and/or 12V to 150V in a single rail. We need to know your design requirements in order to tell you slew rate in 32V/usec is adequate for your application. 

    The issues are that HS Op amp has the slew rate you will need, but it may not have to the output voltage swing required for your application. Our Precision Op Amp may meet your output voltage swing requirements, but we may not have a part that has the higher slew rate (>32V/usec). Therefore, we need to know your design or application requirements. 

    Best,

    Raymond

  • 0 in reply to zhang ping
    Guru 48395 points

    So Zhang, still a little tough to figure out what you need, 

    1. Need the gain setting and required small signal bandwidth

    2. need the load

    If you really need +/-75V supplies (or is that the swing required) and 35V/usec slew rate, that is kind of outside the TI product offerings. I think the highest voltage high speed part that might have the slew rate is about 40V total supply. The higher voltage op amps cannot support the slew rate. 

    There are solutions from Apex Microtechnology in this space, let me know if you want some part number, but answer those other things first.