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550D107X0020S2 Datasheet(PDF) 8 Page - Vishay Siliconix |
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550D107X0020S2 Datasheet(HTML) 8 Page - Vishay Siliconix |
8 / 8 page www.vishay.com 31 550D Vishay Sprague Document Number: 40017 Revision 11-Nov-04 For technical questions, contact tantalum@vishay.com 2. A-C Ripple Voltage: The maximum allowable ripple voltage shall be determined by the formula: or, from the formula: where P= Power Dissipation in Watts @ + 25°C as given in the table in Paragraph Number 5 (Power Dissipation). RESR = The capacitor Equivalent Series Resistance at the specified frequency. Z= The capacitor impedance at the specified frequency. 2.1 The sum of the peak AC voltage plus the DC voltage shall not exceed the DC voltage rating of the capacitor. 2.2 The sum of the negative peak AC voltage plus the applied DC voltage shall not allow a voltage reversal exceeding 15% of the DC working voltage at + 25°C. 5. Power Dissipation: The figures shown relate to an approximate + 20°C rise in case temperature measured in free air. Power dissipation will be affected by the heat sinking capability of the mounting surface. Non-sinusoidal ripple current may produce heating effects which differ from those shown. It is important that the equivalent Irms value be established when calculating permissable operating levels. 1. A-C Ripple Current: The maximum allowable ripple current shall be determined from the formula: P= Power Dissipation in Watts @ + 25°C as given in the table in Paragraph Number 5 (Power Dissipation). GUIDE TO APPLICATION 3. Reverse Voltage: These capacitors are capable of withstanding peak voltages in the reverse direction equal to 15% of the DC rating at + 25°C, 10% of the DC rating at + 55°C; 5% of the DC rating at +85°C. 4. Temperature Derating: If these capacitors are to be operated at temperatures above + 25°C, the permissible rms ripple current or voltage shall be calculated using the derating factors as shown: RESR = The capacitor Equivalent Series Resistance at the specified frequency. Vrms = Irms x Z Vrms = Z P RESR P RESR Irms = Temperature Derating Factor + 25°C + 55°C + 85°C + 125°C 1.0 0.8 0.6 0.4 0.185 0.225 Case Code Maximum Permissible Power Dissipation @ + 25 °C (Watts) in free air R S |
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