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TPS54320: about Css

ACGUY
Guru 11170 points
Part Number: TPS54320

Hello E2E,

What is the minimum value of Css?
Does this device able to start-up with SS-port on open state?

Regards,
ACGUY

  • +1
    TI__Mastermind 47760 points

    Hi ACGUY,

     There is no limitation on minimum value of Css. Lower Css will just decrease the soft-start time. We recommend to add a Css placeholder in your circuit and not open it. Because without Css, the start tp ramp time is very fast. The output capacitor may pull excessive inrush current that, in addition to the load current., cause the inductor current go higher and hit current limit threshold. Potentially causing longer start up time(hiccup) or not start up at all.

    Thanks,

    Nancy