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OPA564: Not equivalent to cross reference search LT1970

Steven Shenker
Intellectual 800 points
Part Number: OPA564
Other Parts Discussed in Thread: OPA593

Hi there,

I have been trying to find an alternative to the LT1970 by Linear. The suggested TI cross referenced part of the OPA564 does not have similar functionality.

Does TI have a part or a combination of parts that can do reasonably accurate current limiting on the fly with independent source and sink limits? 

Thanks in advance,

  • 0
    TI__Guru* 93105 points

    Hello Steve,

    Unfortunately, our Precision Amplifier power op amps do not feature independent sink and source current limiting. They are set by a common current set limit resistor RSET as seen in the OPA564 datasheet figures.

    Some of the power op amp current limiting accommodate being set "on the fly" using a DAC to control the limit. Our new HV, 0.25 A max OPA593 shows how this is done in the datasheet:

    https://www.ti.com/lit/ds/symlink/opa593.pdf

    The output sink/source current would have to be monitored to determine the output mode the op amp is in, and then the current limit set by the DAC to track it. 

    Regards, Thomas

    Precision Amplifiers Applications Engineering