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OPA544 / difference result between TINA-TI simulation and actual evaluation

K.Yaita
Guru 29720 points
Other Parts Discussed in Thread: OPA544, TINA-TI

Hi TI members,

My customer is designing V/I conversion circuit with OPA544.
He found a difference result between that of TINA-TI simulation and actual evaluation, and wants to know a root cause.
Could you send me an e-mail to the following address?

yaita-k@clv.macnica.co.jp

I would like to send my customer's schematic and waveform.

Best Regards,
Yaita / Japan disty

  • 0
    TI__Guru* 93105 points

    Yaita-san,

    The OPA544 is a legacy power op amp. It and its SPICE simulation model, a simple Boyle model, were introduced around 1995. The model only includes the following parameters at most:

    • Maximum positive output voltage swing
    • Maximum negative output voltage swing
    • Slew rate
    • Quiescent power dissipation
    • Input bias current
    • Open-loop voltage amplification
    • Unity gain frequency
    • Common-mode rejection ratio
    • Phase margin
    • DC output resistance
    • AC output resistance
    • Short-circuit output current limit

    Most of these parameters could only be set to a first-order and that doesn't provide enough information to provide one-on-one replication of the amplifier's true electrical performance. Therefore, what is observed in an actual OPA544 circuit can be different from what is received from a simulation.

    Please forward the circuit, the setup and operating conditions information, and waveform images to my email:

    kuehl_tom@ti.com

    I will be traveling this coming week, but will make sure the information makes its way to our Precision Amplifiers Op Amps Applications group for review.

    Regards, Thomas

    PA - Linear Applications Engineering