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Estimating of Lifetime

                 Functional Polymer Capacitors                                 FPCAP
                                Solid Electrolytic Capacitors with Functional Polymer



                                           FPCAP RE Series

 Calculation formula of lifetime
  In general, calculation formula of lifetime of capacitors is appeared as follows.
 FPCAP RE's calculation formula of lifetime is same as usual capacitors.

           LX = L0 10(T0-TX)/20
     Where,
       LX (Hrs)     =Life expectance in actual use
       L0 (Hrs)     =Life time
       T0 (105 C)   =Maximum operating temperature (105 C)
       TX ( C)      =Temperature of capacitor in actual use

  On the other hand, temperature Tx adds the circumference temperature T as the
 capacitor temperature and the generating temperature T by ripple current.

           TX=T+ T
        T ( C) = Ambient temperature
          T ( C) = generating temperature

   Furthermore, the generating temperature T by the ripple current is proportional to ripple
 current, and is shown by the following formula. When applying the maximum permissible
 ripple current Io to FPCAP RE, the generating temperature T is about 20 C at inside of
 capacitor. All large capacitance types of RE serve as this temperature in general.


             T = ( I / I0 ) 2    T0
        I (A rms) = Ripple current in actual use
        I0 (A rms) = Maximum permissible ripple current
         T0 ( C) = Generated temperature value by maximum permissible ripple current
                     [About 20 ( C) ]



42                      FUJITSU MEDIA DEVICES LIMITED

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