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TAP156006 Datasheet(PDF) 10 Page - AVX Corporation |
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TAP156006 Datasheet(HTML) 10 Page - AVX Corporation |
10 / 16 page 152 ■ MAY 2013 1.3.4 Temperature dependence of dissipation factor Dissipation factor varies with temperature as the typical curves show to the right. For maximum limits please refer to ratings tables. Typical Curves-Dissipation Factor vs. Temperature 100 F/6V 1 F/35V 10 5 0 -55 -40 -20 0 20 40 60 80 100 125 Temperature C 1.4 IMPEDANCE, (Z) AND EQUIVALENT SERIES RESISTANCE (ESR) 1.4.1 Impedance, Z This is the ratio of voltage to current at a specified frequency. Three factors contribute to the impedance of a tantalum capacitor; the resistance of the semiconducting layer, the capacitance, and the inductance of the electrodes and leads. At high frequencies the inductance of the leads becomes a limiting factor. The temperature and frequency behavior of these three factors of impedance determine the behavior of the impedance Z. The impedance is measured at 25°C and 100 kHz. 1.4.2 Equivalent series resistance, ESR Resistance losses occur in all practical forms of capacitors. These are made up from several different mechanisms, including resistance in components and contacts, viscous forces within the dielectric, and defects producing bypass current paths. To express the effect of these losses they are considered as the ESR of the capacitor. The ESR is frequency dependent. The ESR can be found by using the relationship: ESR = Tan 2πfC where f is the frequency in Hz, and C is the capacitance in farads. The ESR is measured at 25°C and 100 kHz. ESR is one of the contributing factors to impedance, and at high frequencies (100 kHz and above) is the dominant factor, so that ESR and impedance become almost identical, impedance being marginally higher. 1.4.3 Frequency dependence of impedance and ESR ESR and impedance both increase with decreasing frequency. At lower frequencies the values diverge as the extra contri- butions to impedance (resistance of the semiconducting layer, etc.) become more significant. Beyond 1 MHz (and beyond the resonant point of the capacitor) impedance again increases due to induction. 1k 100 10 1 0.1 0.01 0.1 μF 0.33 μF 1 μF 10 μF 33 μF 100 μF 330 μF 100 1k 10k 100k 1M Frequency f (Hz) Impedance (Z) ESR Frequency Dependence of Impedance and ESR TAP/TEP Technical Summary and Application Guidelines |
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