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[SOLVED] Steady state power system design

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MD_SHAHRUKH

MD_SHAHRUKH

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Hello everyone.
I have designed two power supply circuit, which is below.
doubt_3v3.jpg
doubt_5v.jpg
these two power supply is generated using 12V.

I need to know the time to reach the steady-state voltage. Do i need to calculate the RC filter. And if so what value of output resistance should i consider? and I need this because I need to avoid the sneak paths. my system contains few voltage level shifters.

can you suggest me the exact calculation I need to do.

Thank you.
 

Hi,

I'd consult the datasheet.
And if it does not give the expected information I'd start a simulation.

You may also build the circuit and use a scope.

Do i need to calculate the RC filter.
Click to expand...
Which R and which C are you talking about?

Klaus
 

There's no relevant RC time constant in your circuit. Why don't you simply refer to the start-up waveform in TPS56220 datasheet? Optionally PSpice transient model?
 

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