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TPS51200: Output Capacitor & inrush current

Frank Liu68
Prodigy 85 points
Part Number: TPS51200

I use TSP51200 for DDR4 DIMM X3

because it has no SS pin

how to make sure larger output cap "254u" (see below picture)

will not trigger over current protect when turn on (inrush current )

  • 0
    TI__Mastermind 24075 points
    Hi Frank,

    At tracking mode, the Vout will track REFIN voltage.
    At non-tracking mode, the typical softstart time is 2ms as it is listed on figure 16 on latest datasheet.

    Based on the caculation Icharge=Vout*Cout/Tss, the charging current with 254uF cap is only 0.076A.

    thanks
    Qian