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OPA2379: About Load(Output) current vs Supply current Graph

Hide
Guru 21045 points

Part Number: OPA2379

Hi Team,

 

Could you please let us know “Load(Output) current vs Supply current Graph” if you have any information?

 

We understand that Quiescent Current per Amplifier(Iq) is 10uA(max) at VS = 5.5V, IO = 0.

However, we would like to know Supply current at IO = some conditions.

 

Regards,

Hide

  • 0
    TI__Guru**** 174826 points

    Hello Hide,

    If output current is positive (flows out of the output pin) then that current increases V+ current by the same amount. V- current is unchanged.

    If output current is negative (flows in to output pin) then that current increases V- current by the same amount. V+ current is unchanged.

  • 0
    TI__Mastermind 24682 points

    Hey Hide, 

    Do you have an example of the graph that you are asking for?

    I believe that using the equation below for supply current should answer the question to a specific system. 

    Isupply = Iquiescent + ILoad

    Iq changes with temperature or supply voltage (Figure 12 and Figure 5 show these trends).  

    All the best,
    Carolina 

  • 0 in reply to Caro Gomez
    Guru 21045 points

    Hi Ron-san, Carolina-san,

     

    Thank you for your prompt reply.

     

    Carolina-san,

     

    Our conditions are the following.

     

    [Conditions]

    -VS is 3.3V (V+ is 3.3V and V- is GND)

    -Input signal (+IN) is 3.3V Square wave

    -IOUT is from 0mA to 10mA

    - Voltage follower circuit

     

    Regards,

    Hide

  • 0 in reply to Hide
    TI__Guru**** 174826 points

    Hide,

    A PMOS transistor (or PNP if you can accept base current loss) used as a 'high side switch' would do the job better. 

    The OPA2379 won't provide 10mA reliably. See figure 6 on page 6 of the data sheet.

     

  • 0 in reply to Ron Michallick
    Guru 21045 points

    Hi Ron-san,

     

    Thank you for kind support.

    10mA is plan level.

    Could you please let us know the maximum load current values at our conditions and “Load(Output) current vs Supply current Graph” if you have any information?

     

    Regards,

    Hide

  • 0 in reply to Hide
    TI__Guru**** 174826 points

    Hide,

    Here is the chart with a 330 ohm load line (10mA @ 3.3V)

    So typically the output current would be dependent on temperature per the intersections.

    Can you describe the load in more detail?

  • 0 in reply to Ron Michallick
    Guru 21045 points

    Hi Ron-san,

    Thank you very much for your help.

    I greatly appreciate your cooperation.

    Regards,

    Hide