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RC4580: Maximum Output Load Capacitance

Sadanori Kato
Guru 36540 points
Part Number: RC4580
Other Parts Discussed in Thread: TINA-TI, OPA627

Hi,

Could you please tell me the maximum output load capacitance with the voltage follower configuration for RC4580 ?
* e.g. : ~100pF without a seriese resistor

Best regards,
Kato

  • 0
    Guru 140200 points
    Hi Sadanori,

    it's hard to say because the datasheet does not contain enough information for a phase stability analysis and there's no TINA-TI simulation file either. But when comparing with similar OPAmps I would say no more than 100...200pF.

    The RC4580 is not designed to drive heavy capacitive loads. It's an audio OPAmp made for applications where you can easily add an output series resistance to isolate any capacitive load. Even resistances in the 10R can considerably help to prevent instability. Or you can use the phase lead compensation method shown in figure 32 of datasheet of OPA627.

    Kai
  • 0 in reply to kai klaas69
    Guru 36540 points

    Hi Kai-san,

    Thank you for your quick reply.

    I understood.

    Best regards,
    Kato

  • 0 in reply to kai klaas69
    TI__Mastermind 20085 points
    Hi Kai,

    Thanks for the help on this.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer