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T491X154K035AS Datasheet(PDF) 11 Page - Kemet Corporation |
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T491X154K035AS Datasheet(HTML) 11 Page - Kemet Corporation |
11 / 100 page 10 1 0.1 -50 -25 0 25 50 75 100 125 Temperature - Degrees Centigrade Multiplier of 100KHz ESR 11. AC Power Dissipation Power dissipation is a function of capacitor size and materials. Maximum power ratings have been established for all case sizes to prevent overheat- ing. In actual use, the capacitor’s ability to dissi- pate the heat generated at any given power level may be affected by a variety of circuit factors. These include board density, pad size, heat sinks and air circulation. TABLE 5 Tantalum Chip Power Dissipation Ratings 12. AC Operation Permissible AC ripple voltage and current are related to equivalent series resistance (ESR) and power dissipation capability. Permissible AC ripple voltage which may be applied is limited by three criteria: a. The positive peak AC voltage plus the DC bias voltage, if any, must not exceed the DC voltage rating of the capacitor. b. The negative peak AC voltage, in combination with the bias voltage, if any, must not exceed the permissible reverse voltage ratings pre- sented in Table 3. c. The power dissipated in the ESR of the capa- citor must not exceed the appropriate value specified in Table 5. Actual power dissipated may be calculated from the following: P= l2 R Substituting I = E Z where: I = rms ripple current (amperes) E = rms ripple voltage (volts) P = power (watts) Z = impedance at specified frequency (ohms) R = equivalent series resistance at specified frequency (ohms) Using P max from Table 5, maximum allowable rms ripple current or voltage may be determined as follows: I (max) = P max/ R E (max) = Z P max/ R These values should be derated at elevated tem- peratures as follows: Temperature Derating Factor 85 C.9 125 C.4 ENVIRONMENTAL 13. Temperature Stability TABLE 6 Temperature Stability Limits Step Leakage Dissipation No. Temp. Capacitance Current Factor 1 +25 C within specified within original within original tolerance limit limit 2 -55 C within ± 10% N/A within original of initial value limit** 3 +25 C within ± 5% within original within original of initial value limit limit** 4 + 85 C within ± 10% within 10X within original of initial value original limit limit*** 5 +125 C *within ± 12%or within 12X within original 20% of initial original limit limit*** value 6 +25 C within ± 5% within original within original of initial value limit limit *+12% is standard. +15% or +20% applies to certain CV values Contact KEMET representative for details. **within 1.5x initial limit for extended CV values. ***within 1.15x initial limit for extended CV values. SOLID TANTALUM CHIP CAPACITORS P= E 2R Z 2 , ©KEMET Electronics Corporation, P.O. Box 5928, Greenville, S.C. 29606, (864) 963-6300 9 FIGURE 9b ESR & Impedance (z) vs Frequency ESR and Z are also affected by temperature. At 100 kHz, ESR decreases with increasing temper- ature. The amount of change is influenced by the size of the capacitor and is generally more pro- nounced on smaller ratings. TANTALUM MnO 2 COMPONENT PERFORMANCE CHARACTERISTICS (con’t.) KEMET EIA R 2012-12 S 3216-12 T 3528-12 U 6032-15 V 7343-20 A 3216-18 B 3528-21 C 3062-28 D 7343-31 X 7343-43 E 7260-38 T530D 7343-31 T510X, T530X 7343-43 T510E, T530E 7260-38 200 255 270 285 85 110 150 165 Case Code Maximum Power Dissipation mW @ +25°C w/+20°C Rise 25 75 60 70 90 125 FIGURE 10 Typical Effect of Temperature on 100 kHz ESR |
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