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TPS2561: Minimum Output ESR (current swing with freq. below deglitch time)

RWE
Intellectual 955 points
Part Number: TPS2561

Hi Team,

My question concerns the output of the system.

I would like to know if there is a minimum required output ESR when working with ceramic caps instead of Elkos; So that the output current swing wont be so fast that the the deglitch circuit will keep the fault pin from asserting. 

Thank you!

  • 0
    TI__Mastermind 18031 points

    Hi RWE,

    It's ok to use ceramic cap.

    For TI's policy, I will first click resolved button.

    If you have any other concern, contact me any time.

    If you think resolved, please help click 'Issue is solved button'.

    Thanks.

  • 0 in reply to Ziv Zhang
    TI__Intellectual 955 points

    Hi Ziv,

    so there is not minimum ESR for the output caps?

    I was just wondering because the datasheet states: "Output capacitance is not required, but placing a high-value electrolytic capacitor on the output pin is recommended when large transient currents are expected on the output."

    Thanks!

  • 0 in reply to RWE
    TI__Mastermind 18031 points

    Hi RWE,

    The reason to place high value capacitor is to stable the input and output voltage.

    As with heavy load suddenly, the input and output voltage may be dropped which may influence the system working.

    So it usually adds some caps to stable the voltage.

    According to your application, you decide the volume of the cap.

    For our new power switch products, we usually add ceramic cap instead of electrolytic cap. Both are fine.

    What do you mean the fault assert concern?

    If any issue as in application, please send it to me for debug.

    Thanks.

    For TI's policy, I will first click resolved button.

    If you have any other concern, contact me any time.

    If you think resolved, please help click 'Issue is solved button'.

    Thanks.

  • 0 in reply to Ziv Zhang
    TI__Intellectual 955 points

    Hi Ziv,

    I see. Higher Input Capacitance solved the assertion problem.

    Thank you