Questions tagged [esr]

ESR is the "equivalent series resistance" of an electrical component (such as a capacitor or inductor) arising from non-idealities that are always present in the materials used in their construction.

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LDO Minimum ESR on output capacitor

I have been wondering for a while. With cheaper LDO regulators I often see them advertise that you can use a ceramic output capacitor. In the datasheet examples they use them. But then they say things ...
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538 views

Help understanding the voltage waveforms across the components of a series RL circuit

The waveforms shown below are voltages taken across a 10 Ohm Resistor (pink) and an 1mH inductor (blue) in series with one another. The circuit is excited by a 1 kHz, 1 volt peak-to-peak sine wave. ...
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ESR of Ceramic Capacitor

I have been doing a bit research on ceramic capacitors, as I need one for the output of my synchronous buck converter. And as its very common that ESR is not straight forwardly given in the data ...
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498 views

Why does an increase in capacitor ESR make the capacitor hotter?

According to what I have read online, if a capacitor's ESR increases, the capacitor temperature will also increase and this has me left a little confused. Consider the simple single resistor circuit ...
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1answer
100 views

Can I use an electrolytic capacitor with a MCP1826S voltage regulator?

I have a MCP1826S and according to the datasheet, I should use an output capacitor of 1-10uF and with an ESR of lower than 1Ω. I have some 4.7uF electrolytic capacitors, but I think they have an ESR ...
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Why does ceramic capacitor ESR change with frequency?

In most datasheets, I see a typical table which shows that ESR of ceramic capacitor changes with frequency. I understand that impedance of every kind of capacitor must have a minimum due to its ...
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11k views

ESR and parallel capacitors

Just wanting to clarify my understanding of ESR here, because I'm not fully sure if it should be modeled the way I would think to model series resistance. Or if it's more complex than that. Basically ...
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3answers
4k views

Why do capacitor datasheets avoid directly giving the ESR value?

Most datasheets give a parameter called "loss tangent" instead of directly giving the ESR value. Why don't they just give a numeric value for it? Why is loss tangent preferred over ESR? Is there ...
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Winding my own inductor-resistance

I am building a boost converter 12VDC-24VDC with output current of \$I_{out}=250\:\mathrm{mA}\$ and input current of around \$I_{in}=600\:\mathrm{mA}\$ and need to design an inductor for it. I've ...
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2answers
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Measuring internal resistance of a battery while it's being charged

I was startled to hear that there are devices out there that can measure the internal resistance of batteries, in circuit, while the batteries are being (trickle-)charged. For example, Hioki markets ...
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519 views

ESR Capacitor ESR - Right selection

I have a PWM signal at 100Hz ("Vg" label at circuit) with variable duty cycle (10%-90%). Because I had voltage spikes I managed to eliminate them by placed three capacitors which types and values are ...
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3answers
4k views

Can I replace a general-purpose electrolytic capacitor with a low-ESR capacitor?

I have a dead PSU. I opened it up, and I found three bulging 1000 µF general purpose-type crappy electrolytic capacitors. I've replaced capacitors like this on several motherboards in the past, ...
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1answer
3k views

How to measure ESR

I have a bunch of capacitors but no clue of what ESR they have. Is there a way to measure the ESR? Can I set up a test circuit to measure it?
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4answers
8k views

ESR meter: Are in-circuit readings accurate?

I recently bought one of these ESR meters, a 'MESR-100': http://www.amazon.com/MESR100-AutoRanging-Circuit-Capacitor-Tester/dp/B00G7OPBP2 It claims to be able to test capacitor ESR with the caps ...
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1answer
1k views

For which frequency is ESR specified by default?

I'm playing around with an REF5010 voltage reference, and its data sheet specifies an output capacitor with an ESR of 1 to 1.5Ω for best performance. Now when I measure the ESR of electrolytic ...
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1answer
2k views

ESR and CSR of Capacitor

I'm trying to spec out an output capacitor for a TPS7201 voltage regulator (http://www.ti.com/lit/ds/symlink/tps7201.pdf). It needs to be selected carefully as it is used to stabilize the internal ...
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2answers
431 views

LDO regulator (LD39300) output capacitor ESR not so small

I want to use the LDO regulator LD39300 of ST. To buffer VOUT, I thought about buffering the output in addition with an aluminum capacitor of 6800 µF in parallel to the recommended 4.7 µF. ...
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1answer
1k views

Are tantalums good for PIC Vcap?

I understand that ceramics are good at ESR but would like to know if tantalum would suffice for my application. Some 16 bit PICs require a >4.7uf cap (10uf recommended) low ESR cap for their internal ...
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3answers
5k views

Modelling Capacitor Leakage

I have a 680uF electrolytic capacitor rated for 25 volts. Yesterday night I was curious as to how much current leaked out of it over time, so I charged it with a generic DC power supply, and measured ...
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1answer
1k views

How does ESR affect cutoff frequency calculations for capacitors?

I'm interested in estimating the cutoff frequency of a capacitor in a simple RC circuit. Since the capacitor and resistor are in series, can I simply add the ESR value to the resistor value? For ...
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2answers
6k views

ESR and ESL, small package vs large (SMD)

I was wondering if someone could explain why larger package capacitors (1210) are supposed to have more ESL and ESR than a smaller - say 0603 package? I would imagine the larger package is still ...
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2answers
2k views

Range for low ESR capacitor

I'm new at the circuit design biz. I'm designing a battery powered device around the TI TPS61025 boost converter, and I'm rather confused about the proper range for the low-ESR output capacitor. The ...
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3answers
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How is ESR specified on ceramic capacitors?

I'm looking for a capacitor to use as the output capacitor with the LDO regulator SP6205EM5-L-3-3. It says it requires a 2.2 µF capacitor, with an ESR less than 0.5 ohm. I've found the ...

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