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LM134 application issue

Kevin Chen1
Prodigy 670 points
Other Parts Discussed in Thread: LM134

Hi,

In the National Semiconductor LM134 datasheet (TI Literature Number: SNVS746C, or National Semiconductor DS005697), page 11 (12 for SNVS746C) In Typical Applications, one of them is "Generating Negative Output Impedance". I can not understand about this application principle.

Could anyone explain me in detail?

Sincerely Kevin

  • 0
    TI__Genius 13515 points

    Hi Kevin,

    The negative output impedance application means that a positive change in the VIN voltage will result in a negative change in the current.  A positive output impedance will have the opposite effect, any increase in voltage will result in a decrease in current. 

    So, using the LM134 as configured in the application diagram, if VIN is increased, the current through the LM134 and R1 will reduce in proportion to R1, until the Iset current is reached.  At this point, the LM134 can no longer control the current flow and the negative impedance characteristic no longer applies.

    Regards,

    Mike