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TAP474035 Datasheet(PDF) 9 Page - AVX Corporation |
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TAP474035 Datasheet(HTML) 9 Page - AVX Corporation |
9 / 16 page MAY 2013 ■ 151 1.2.4 Effect of surges The solid Tantalum capacitor has a limited ability to withstand surges (15% to 30% of rated voltage). This is in common with all other electrolytic capacitors and is due to the fact that they operate under very high electrical stress within the oxide layer. In the case of ‘solid’ electrolytic capacitors this is further complicated by the limited self healing ability of the manganese dioxide semiconductor. It is important to ensure that the voltage across the terminals of the capacitor does not exceed the surge voltage rating at any time. This is particularly so in low impedance circuits where the capacitor is likely to be subjected to the full impact of surges, especially in low inductance applications. Even an extremely short duration spike is likely to cause damage. In such situa- tions it will be necessary to use a higher voltage rating. 1.2.5 Reverse voltage and non-polar operation The reverse voltage ratings are designed to cover exceptional conditions of small level excursions into incorrect polarity. The values quoted are not intended to cover continuous reverse operation. The peak reverse voltage applied to the capacitor must not exceed: 10% of rated DC working voltage to a maximum of 1V at 25°C 3% of rated DC working voltage to a maximum of 0.5V at 85°C 1% of category DC working voltage to a maximum of 0.1V at 125°C 1.2.6 Non-polar operation If the higher reverse voltages are essential, then two capacitors, each of twice the required capacitance and of equal tolerance and rated voltage, should be connected in a back-to-back configuration, i.e., both anodes or both cathodes joined together. This is necessary in order to avoid a reduction in life expectancy. 1.2.7 Superimposed AC voltage (Vrms) - Ripple Voltage This is the maximum RMS alternating voltage, superimposed on a DC voltage, that may be applied to a capacitor. The sum of the DC voltage and the surge value of the superimposed AC voltage must not exceed the category voltage, Vc. Full details are given in Section 2. 1.2.8 Voltage derating Refer to section 3.2 (pages 155-157) for the effect of voltage derating on reliability. 85°C 125°C Rated Surge Category Surge Voltage Voltage Voltage Voltage (V DC) (V DC) (V DC) (V DC) 2 2.6 1.3 1.7 342 2.6 4 5.2 2.6 3.4 6.3 845 10 13 6.3 9 16 20 10 12 20 26 13 16 25 33 16 21 35 46 23 28 50 65 33 40 1.3 DISSIPATION FACTOR AND TANGENT OF LOSS ANGLE (TAN D) 1.3.1 Dissipation factor (DF) Dissipation factor is the measurement of the tangent of the loss angle (Tan ) expressed as a percentage. The measurement of DF is carried out at +25°C and 120 Hz with 2.2V DC bias max. with an AC voltage free of harmonics. The value of DF is temperature and frequency dependent. 1.3.2 Tangent of loss angle (Tan ) This is a measure of the energy loss in the capacitor. It is expressed as Tan and is the power loss of the capacitor divided by its reactive power at a sinusoidal voltage of specified frequency. (Terms also used are power factor, loss factor and dielectric loss, Cos (90 - ) is the true power factor.) The meas- urement of Tan is carried out at +20°C and 120 Hz with 2.2V DC bias max. with an AC voltage free of harmonics. 1.3.3 Frequency dependence of dissipation factor Dissipation Factor increases with frequency as shown in the typical curves below. 10 F 10V 1.0 F 35V 100 50 20 10 5 2 1 100Hz 1kHz 10kHz 100kHz Frequency Typical Curve-Dissipation Factor vs. Frequency TAP/TEP Technical Summary and Application Guidelines |
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