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OPA541 / power supply rejection vs frequency

Toshiyuki
Mastermind 7075 points
Other Parts Discussed in Thread: OPA541, OPA549

Hi,

Would you please provide us PSRR vs frequency data for OPA541 ?

Best Regards,

Kato

  • 0
    TI__Guru* 93105 points

    Hello Kato-san,

    I searched our archieves and did not find any PSRR vs. frequency information for the OPA541, unfortunately. A "rough" approximation for most power op-amps is the positive PSRR tends to be similar to the CMRR curve, while the negative PSRR usually is lower by several tens of dB and has a lower break frequency.

    Regards, Thomas

    PA - Linear Applications Engineering

     

  • 0 in reply to Thomas Kuehl
    Mastermind 7075 points

    Hi Thomas - san,

    Thank you for the reply. However, power op-amp, OPA549  has different characteristics as follows.

    Could we consider the OPA541 has almost the same PSRR characteristics for OPA549 ?

    Best Regards,

    Kato

  • 0 in reply to Toshiyuki
    TI__Guru* 93105 points

    Hello Kato-san,

    The PSRR vs. frequency behavior is topology dependent. Since the OPA549 uses a very different internal topolgy from that used by the OPA541, there is no correlation.

    Regards, Thomas

    PA - Linear Applications Engineering