TPS5420 Datasheet Question

Toshio Ushikubo

Mastermind 9620 points

Hello,

Datasheet P15 has equation(14) and use “Co(EFF) “.

“Co(EFF)2 should be the output capacitor but cutomer want to Know the meaning of (EFF).

Please advice the meaning of (EFF).

Regards.

over 10 years ago

0 JohnTucker over 10 years ago

TI__Guru**** 191445 points

That equation is used for ceramic output capacitors. For ceramic capacitors, the actual capacitance is dependent on the applied dc voltage relative to the rated voltage of the capacitor. So Co(EFF) is the effective output capacitance after the dc bias effect is applied rather than the nominal value.

0 Toshio Ushikubo over 10 years ago in reply to JohnTucker

Mastermind 9620 points

Hello John-san,

Thank you for your answer.

Regards.

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TPS5420 Datasheet Question