raymondq
Newbie level 4
Hi,
I have make a custom board with cPCI interface which have 3.3, 5 +/-12v power supply input
I have used a pair of bypass capacitor(in paralled) for all these power input.
The capacitor value are 10uf, 50v and 0.1uf, 50v.
However, i realised that the -12V supply fluculate (current fluculate) when i power on the board.
I did not use -12V in my design. the -12V are onli connected to the bypass capacitor.
when i remove the bypass capacitor for the -12V supply. the current drawn is stable.
Is this problem caused by insuffienct cap vaule?
Can anyone advise on the vaule of bypass capacitors for all these input supply for cpci design?
I have make a custom board with cPCI interface which have 3.3, 5 +/-12v power supply input
I have used a pair of bypass capacitor(in paralled) for all these power input.
The capacitor value are 10uf, 50v and 0.1uf, 50v.
However, i realised that the -12V supply fluculate (current fluculate) when i power on the board.
I did not use -12V in my design. the -12V are onli connected to the bypass capacitor.
when i remove the bypass capacitor for the -12V supply. the current drawn is stable.
Is this problem caused by insuffienct cap vaule?
Can anyone advise on the vaule of bypass capacitors for all these input supply for cpci design?