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RC4580: the inter structure of the Opamp

Zhun Liu
Intellectual 290 points
Part Number: RC4580

Below is the inter structure of the Opamp RC4580 from datasheet.  I would like to know more about it.

When Va = V(+input)-V(-input) > 0 , What will happen to Q1 and Q2 ?

When Va = V(+input)-V(-input) < 0 , What will happen to Q1 and Q2 ?

And could you tell me , if PIN(output) is open, and Va = V(+input)-V(-input) ＞0 ,  will the output voltage be divided by Q1 and Q2?   Or will be about the same as Vcc+?

  • 0
    TI__Mastermind 20085 points
    Hi Zhun Lui,

    The internal circuitry and the internal operation of the device are the intellectual property of TI.
    The functional block diagram is just to provide an idea of the device circuit.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer
  • 0 in reply to José Luis
    Intellectual 290 points
    Hi José Luis Figueroa,
    We are let the output be open on purpose, then measure the Vout to confirm whether the reason of defect is RC4580.
    Could you please tell me if PIN(output) is open, and V(+input)-V(-input) ＞0 , will the output voltage will be about the same as Vcc+? or will be significantly lower than Vcc+?