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Original question:

OPA547: OPA 547 : Problem with current limiting

OPA547: Output stage compensation

Jerold Green
Prodigy 10 points
Part Number: OPA547
Other Parts Discussed in Thread: TINA-TI

I have a design that drives an inductive load, but the data sheet doesn't give any guidance beyond using 3 ohm with .01 uF and "Some variations in circuit values may be required with certain loads". Is any better  advice available?

  • 0
    Guru 140200 points
    Hi Jerold,

    you can simulate your OPA547 application with TINA-TI and run a step response and phase stability analysis.

    Kai
  • 0
    TI__Guru* 93105 points
    Hi Jerold,

    Regarding the series RC network connected from the OPA547 output to ground have a look at this Wikipedia link:

    en.wikipedia.org/.../Zobel_network

    See the information under the "Zobel Networks and Loudspeaker Drivers." The loudspeaker is modeled as a series RL circuit. In your application's case the load could be a loudspeaker, actuator, motor, etc., or other device that can be modeled as a series RL circuit.

    The Wikipedia information explains what the Zobel Network RC does when applied in conjunction with the load RL device. It should help you better determine more appropriate RC values.

    Regards, Thomas
    Precision Amplifiers Applications Engineering
  • 0 in reply to Thomas Kuehl
    TI__Genius 11135 points
    Jerold

    We haven't heard back from you so we assume this answered your questions. If you need additional help just post another reply below.

    Thanks
    Dennis