Panasonic ee23 User Manual

Aluminum Electrolytic Capacitor

Design, Specifications are subject to change without notice. Ask factory for technical specifications before purchase and/ or use.
Whenever a doubt about safety arises from this product, please inform us immediately for technical consulation without fail.

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EE16

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Application Guidelines

1. Circuit Design

E n s u r e t h a t operational and mounting conditions
follw the specified conditions detailed in the catalog
and specification sheets.

1.1 Operating Temperature and Frequency

E l e c t r o l y t i c c a p a c i t o r e l e c t r i c a l p a r a m e t e r s a r e
nor mally specified at 20

C temperature and 120Hz

frequency. These  parameter s var y  with changes in
t e m p e r a t u r e   a n d   f r e q u e n c y.  C i r c u i t   d e s i g n e r s
should take these changes into consideration.
(1) Effects of o p e r a t i n g   t e m p e r a t u r e  on electr ical
parameters
     a ) A t   h i g h e r   t e m p e r a t u r e s, l e a k a g e   c u r r e n t   a n d
           c a p a c i t a n c e   i n c r e a s e   while equivalent series
resistance(ESR) decreases.
      b)A t   l o w e r   t e m p e r a t u r e s ,   l e a k a g e   c u r r e n t   a n d
           c a p a c i t a n c e   decrease while equivalent series
resistance(ESR) increases.
(2) Effects of fr e q u e n c y   on  e l e c t r i c a l   p a r a m e t e r s
     a ) A t   h i g h e r   f r e q u e n c i e s ,   c a p a c i t a n c e   a n d
impedance decrease while tan

increases.

b)At lower frequencies, r ipple current generated
heat will r i s e d u e t o a n increase in equivalent
ser ies resistance (ESR).

1.2 Operating Temperature and Life Expectancy

(1) Expected life is affected by operating temperature.

Generally, each 10

C reduction in temperature

  will  double  the  expected  life.    Use  capacitors  at
           t h e   l o w e s t   p o s s i b l e   t e m p e r a t u r e   b e l o w   t h e
  maximum guaranteed temperature.
(2) I f   o p e r a t i n g   c o n d i t i o n s   e x c e e d   t h e   m a x i m u m
           g u a r a n t e e d   l i m i t ,  r a p i d   e I e c t r i c a l   p a r a m e t e r
  deterioration will occur, and irreversible damage
will result.
  Check for maximum capacitor operating tempera-
  tures  including  ambient  temperature,    inter nal
    capacitor temperature rise caused by ripple  current,
            a n d   t h e   e f f e c t s   o f   r a d i a t e d   h e a t   f r o m   p o w e r
     transistors, IC?s or resistors.
  Avoid  placing  components  which could conduct
  heat to the capacitor from the back side of the circuit
board.
(3)The for mula for calculating expected Iife at lower
operating temperatures is as fllows;

= L

x 2 where,

: Guaranteed life (h) at temperature, T

: Expected life (h) at temperature,T

: Maximum operating temperature (

: Actual operating temperature, ambient

temperature + temperature rise due to
ripple currentheating(

A quick eference capacitor guide for estimating
exected life is included for your reference.

2000

5000

10,000

20,000

50,000

100,000

200,000

120

110

100

8h/d

■

Expected Life Estimate Quick Reference Guide

■

Failure rate curve

1. 85

C2000h

2.105

C1000h

3.105

C2000h

4.105

C5000h

Capacitor Ambient

mper

ature

(h)

Years

24h

operat-
ion

ailure r

ate

Time

Initial failure period

Life Time

Random failure period

Wear failure period

Mar. 2005