Correct me if I'm wrong but formally speaking ESR is the resistive component of a capacitor's impedance.
If I've got that right, then I don't see why it should be frequency dependent. How come in all datasheets where ESR is listed it's always quoted at specific frequencies (usually 100Khz)?
I can see why it may be temperature dependent.
It seems to me that a lot of the web resources I've looked at on capacitor ESR are confusing. In wikipedia it even said that ESR includes the resistance of the dielectric? That can't be right as ESR would then be measured in megaohms. The quoted figures are usually a few ohms or a fraction of an ohm.
Usually I wouldn't bother looking at ESR but I've designed a circuit with the ICL7660. I've actually built this thing but I'm seeing a big ripple voltage on the output. I looked at the datasheet and it said that ESR is one of the main factors governing that ripple (and even gave a formula to calculate the peak to peak). I'm now trying to source alternative caps with low ESR ratings. Unfortunately some of the stores I've been to the people don't know what ESR is.
After looking at the web may be I don't know either.
If I've got that right, then I don't see why it should be frequency dependent. How come in all datasheets where ESR is listed it's always quoted at specific frequencies (usually 100Khz)?
I can see why it may be temperature dependent.
It seems to me that a lot of the web resources I've looked at on capacitor ESR are confusing. In wikipedia it even said that ESR includes the resistance of the dielectric? That can't be right as ESR would then be measured in megaohms. The quoted figures are usually a few ohms or a fraction of an ohm.
Usually I wouldn't bother looking at ESR but I've designed a circuit with the ICL7660. I've actually built this thing but I'm seeing a big ripple voltage on the output. I looked at the datasheet and it said that ESR is one of the main factors governing that ripple (and even gave a formula to calculate the peak to peak). I'm now trying to source alternative caps with low ESR ratings. Unfortunately some of the stores I've been to the people don't know what ESR is.
After looking at the web may be I don't know either.