TPS54260-Q1: Value of Cout for calculating parameters.

Ajeya Anand

Part Number: TPS54260-Q1

The datasheet frequently mentions Co or Cout. Is this an internal capacitor. If yes, what is its value. Otherwise, how do I arrive at the value ?

Thanks,

over 8 years ago

0 Vental Mao over 8 years ago

TI__Expert 5745 points

This is the output capacitor, you can set the value in the section 8.2.2.3

0 Ajeya Anand over 8 years ago in reply to Vental Mao

Intellectual 365 points

Figure 48 shows a capacitor value Co, is this different from Cout used in 8.2.2.3 ?

Please also point out which capacitor in Figure 50 (example of 3.3V output design) corresponds to Cout ?

0 JohnTucker over 8 years ago in reply to Ajeya Anand

TI__Guru**** 191445 points

You are probably referring to "Co" in figures 38 and 40. That is the output capacitance of the error amplifier. You generally do not need to know it, but it is

Co = gmea / (2*pi*GBW) = 18 pF. For section 8.2.2.3, that is the output capacitor(s).

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TPS54260-Q1: Value of Cout for calculating parameters.