Upper limit of R in CRC any issue besides dissipation ?

[coolnose]

HI Everybody,

I'am just playing around with PSUD2 and was wondering of the was an upper limit on the resistance for the R in a CRC or CRCRC filter.

I am aware of the power dissipation and the voltage drop, but is there something I might have overlooked ?

Funny thing is that when getting above a certain resistance level the ripple voltage starts to increase again, going higher than something like 5R in a CRC with a total of 20000 uF in my particular case.

Thanks in advance,

Max

[bob91343]

With all the acronyms and lack of references, I find it impossible to understand your question, much less give an answer. Post a diagram and explain in words, not symbols.

[stratus46]

Originally Posted by bob91343

With all the acronyms and lack of references, I find it impossible to understand your question, much less give an answer. Post a diagram and explain in words, not symbols.

I agree with your opinion. I wonder if he's describing a pi filter with resistors instead of inductors? If that is the case the only other thing is there is a maximum voltage on resistors regardless of dissipation as shown in this Vishay datasheet. See note 1.

http://www.vishay.com/docs/31012/31012.pdf

G²

[DF96]

The ripple voltage on the first (reservoir) capacitor will rise with the resistance, but the output ripple (second cap) should reduce. In real life you need to get the grounding right too, but PSUD2 will not worry about that.

[npetralias]

This resistance increases the PSU's total internal resistance and limits the peak flow of current.
In audio applications you can hear the bass getting softer and softer...