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OPA132: Output voltage equal to or greater than the power supply voltage

cafain
Mastermind 6625 points
Part Number: OPA132

Tool/software:

HI, Staff

OPA132 (SBOS504C) Page 10 Typical Characteristics states that the test condition is Vs=±15V.
The vertical axis of Figure 5-18 is output voltage (V), and when the output current is 0 mA, it can be read from the graph to be approximately +17.8 V and -17.7 V.

I don't think it's possible to output an output voltage higher than the power supply voltage.
Is Figure 5-18 a graph when Vs=±18V?　(Is it a MAX characteristic rather than a typical characteristic?)
Can you comment on this?

regards

  • 0
    TI__Guru 62601 points

    Hi Cafain,

    cafain said:
    Is Figure 5-18 a graph when Vs=±18V?　(Is it a MAX characteristic rather than a typical characteristic?)

    The captured table below specified the Vout swing as a function of load, which the output stage can swing below the supply rails, when Iout <10mA. On the positive supply rail, it is only specified the typical figure. It depends on a part, and the output swing variation is as low as 1.2 below the supply rail at 10kohm load, typically is 0.9V below the supply rail at the load.  On the negative output swing, it is specified the max. figure, which is approx. 0.5V above the negative supply rail at 10kohm load.  

    As the Iout increases, the output stage's voltage swing will droop per the Figure 5-18. 

    Per the Figure 5-18 (aka claw curve), you may interpret that these are max. output voltage swing in this part, but the plot is shown a typical Vout swing vs. Iout from 0mA to 45mA range (close to Isc). The claw curve of an op-amp refers to the nonlinear output relationship that tested under the specific conditions (typical). The output voltage swing variations can vary in a wider range per the figures specified in the table. 

    If you have have other questions, please let us know. 

    Best,

    Raymond 

  • 0 in reply to Raymond Zhang1
    Mastermind 6625 points

    Thank you for your comment.
    I understood that Figure 5-18 is a graph of Vs = ±18V, regardless of the test conditions of TA = 25°C, Vs = ±15V, RL = 2kΩ described in 5.8 Typical Characteristics.

    regards
    cafain

  • +1 in reply to cafain
    TI__Guru 62601 points

    Hi Cafain,

    Did I answer your question? Please let me know. 

    Best,

    Raymond