MLCC ESR Dissipation Calculator

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MLCC ESR Dissipation Calculator

Calculate the power dissipated in a MLCC due to RMS current through its equivalent series resistance (ESR). Useful for power supply decoupling, DC-DC converters, and ripple current analysis.

Input Parameters

RMS Current

ESR (Equivalent Series Resistance)

Duty Cycle (%)

Results

RMS Power Dissipation

Effective Current

Design Note

Formula

P = I_RMS² × ESR × (Duty Cycle / 100)

Where I_RMS is the RMS current through the capacitor, ESR is the equivalent series resistance, and Duty Cycle accounts for pulse modulation if applicable.

Frequently Asked Questions (FAQ)

Q1: What is ESR in MLCC?
Equivalent Series Resistance represents losses due to the internal resistance of the capacitor.

Q2: How is power dissipation calculated?
It is RMS current squared multiplied by ESR, adjusted for duty cycle if pulsed.

Q3: Can high ESR cause overheating?
Yes, excessive ESR can cause significant power loss and temperature rise.

Q4: Can I use this for multiple MLCCs in parallel?
Yes, sum their ESR in parallel and compute total power accordingly.

Q5: Is the result exact?
It is an approximation; real power dissipation depends on waveform shape, temperature, and frequency.

Q6: Why include duty cycle?
For pulsed or switching currents, power dissipation scales with the fraction of time the current is applied.

Disclaimer: This calculator is for reference only. Real MLCC power dissipation may vary depending on frequency, temperature, waveform shape, and manufacturer specifications.

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