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A700V826M006ATE028 Datasheet(PDF) 2 Page - Kemet Corporation |
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A700V826M006ATE028 Datasheet(HTML) 2 Page - Kemet Corporation |
2 / 12 page DC Leakage Current is the current that flows through the capacitor dielectric after a five minute charging period at rated voltage. Leakage is meas- ured at 25°C with full rated voltage applied to the capacitor through a 1000 ohm resistor in series with the capacitor. DC Leakage Current does increase with tempera- ture. The limits for 85°C @ Rated Voltage and 125°C are both 2 times the 25°C limit. 7. Dissipation Factor (DF) Refer to part number tables for maximum DF limits. Dissipation factor is measured at 120 Hz, up to 1.0 volt rms maximum. Dissipation factor is the ratio of the equivalent series resistance (ESR) to the capaci- tive reactance, (Xc) and is usually expressed as a percentage. It is directly proportional to both capaci- tance and frequency. Dissipation factor loses its importance at higher frequencies, (above about 1 kHz), where impedance (Z) and equivalent series resistance (ESR) are the normal parameters of con- cern. DF is also referred to as tan δ or "loss tangent." The "Quality Factor," "Q", is the reciprocal of DF. 8. Equivalent Series Resistance (ESR) and Impedance (Z) The Equivalent Series Resistance (ESR) of the AO- CAP is much lower than standard Tantalum caps because the polymer cathode has much higher con- ductivity. ESR is not a pure resistance, and it decreases with increasing frequency. Total impedance of the capacitor is the vector sum of capacitive reactance (Xc) and ESR below reso nance; above resonance total impedance is the vec- tor sum of inductive reactance (XL) and ESR. To understand the many elements of a capacitor, see Figure 3. Figure 3 The Real Capacitor A capacitor has a complex impedance consisting of many series and parallel elements, each adding to the complexity of the measurement system. ESL - Represents inductance. In most instances it is significant at the basic measurement frequencies of 120 and 1000 Hz. ESR - Represents the ohmic resistance in series with the capacitance. Lead attachment and capacitor electrodes are contributing sources. DF = X c = 2 πfCR Where: DF = Dissipation Factor R = Equivalent Series Resistance (Ohms) Xc = Capacitive Reactance(Ohms) f = Frequency (Hertz) C = Capacitance (Farads) R Xc ESR δδ θθ Xc = 2 πfC (Ohms) Where: f = frequency (Hertz) C = capacitance (Farad) 1 Figure 2a Total Impedance of the Capacitor Below Resonance XL = 2πfL (Ohms) Where: f = frequency (Hertz) L = inductance (Henries) δδ θθ XL Z Figure 2b Total Impedance of the Capacitor Above Resonance ESL ESR C RL Cd Rd ESR ©KEMET Electronics Corporation, P.O. Box 5928, Greenville, S.C. 29606, (864) 963-6300 ALUMINUM ORGANIC CAPACITORS Performance Characteristics 59 |
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