I'm looking for replacement filter capacitors for my amp and found a really good one, but by the spec sheet I can't tell the actual leakage current rating. Is 3 milli amps a maximum? Because if it was the actual one, then it's way too high. Here's the line from the data sheet:
Here's the full document: Datasheet
I would appreciate if someone could explain it to me and possibly tell the actual rating.
Here's the full document: Datasheet
I would appreciate if someone could explain it to me and possibly tell the actual rating.
So I = 0.02 x C x V is the formula to use when a capacitor is chosen. I understand it now, thank you. It seems like we can get the maximum, but the spec sheet doesn't specify the actual expected value unfortunately.
In this case I'm going to measure the leakage of the current caps then compare it to the new ones. I'm gonna use half the rated voltage to measure leakage, please let me know if you recommend different voltage level. Thanks again.
In this case I'm going to measure the leakage of the current caps then compare it to the new ones. I'm gonna use half the rated voltage to measure leakage, please let me know if you recommend different voltage level. Thanks again.
You only need the max to be sure it fits your need. It can be anything below that, varying in time and with voltage and temperature.
So measuring it only gives you a snapshot that doesn't say anything about the actual use after today.
The max spec implicitly means: 'we really don't know much about it but we're pretty sure it won't be more than this'.
Jan
So measuring it only gives you a snapshot that doesn't say anything about the actual use after today.
The max spec implicitly means: 'we really don't know much about it but we're pretty sure it won't be more than this'.
Jan
This is a power supply in an audio amplifier (Marantz pm7200). I have limited knowledge about this but as I know we want the leakage current to remain in the micro amp range to avoid noise. I might be wrong, but haven't found a definite answer yet.
My idea is to remove and measure the one that's inside the amp which is working fine and doesn't introduce any noise. Then measure the new one too, and if the new one has a lower leakage, then I'm happy to use it.
The PM7200 is almost certainly a classAB amp. As such the noise (aka 'ripple') on the main supply will be a function of the current drawn by the speakers in response to the audio signal and that's typically going to be orders of magnitude higher than 3mA. I'd not sweat it myself.
Thanks @abraxalito , please note that the PM7200 can operate in class A mode as well using twice the power than in class AB.
So you select the cap on a spec that's irrelevant?
How about dissipation, life time, temp range? Those are relevant!
Jan
You are right Jan, but those specs are all fine, so I was only curious about the leakage current as I read it can introduce noise. That's why I focused on it in my question.