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    參數(shù)資料
    

    


    


    
型號(hào)：
C192G102D5CH5CM

    

    
廠商：
KEMET Corporation

    

    
英文描述：
MILITARY SPECIFCATIONS ON BACK

    

    
中文描述：
背面軍事SPECIFCATIONS

    

    
文件頁(yè)數(shù)：
37/40頁(yè)

    

    
文件大?。?/td>
580K

    

    
代理商：
C192G102D5CH5CM


    

    

    

	
    
    
    

    
    
	
    KEMET Electronics Corporation, P.O. Box 5928, Greenville, S.C. 29606, (864) 963-6300
    37
    KEMET
    APPLICATION NOTES FOR MULTILAYER CERAMIC CAPACITORS
    A
    Effect of Temperature:
     Both capacitance and dissipa-
    tion factor are affected by variations in temperature. The max-
    imum capacitance change with temperature is defined by the
    temperature characteristic. However, this only defines a “box”
    bounded by the upper and lower operating temperatures and
    the minimum and maximum capacitance values. Within this
    “box”, the variation with temperature depends upon the spe-
    cific dielectric formulation. Typical curves for KEMET capaci-
    tors are shown in Figures 3, 4, and 5. These figures also
    include the typical change in dissipation factor for KEMET
    capacitors.
    Insulation resistance decreases with temperature.
    Typically, the insulation resistance at maximum rated temper-
    ature is 10% of the 25°C value.
    Effect of Voltage:
     Class I ceramic capacitors are not
    affected by variations in applied AC or DC voltages. For Class
    II and III ceramic capacitors, variations in voltage affect only
    the capacitance and dissipation factor. The application of DC
    voltage higher than 5 vdc reduces both the capacitance and
    dissipation factor. The application of AC voltages up to 10-20
    Vac tends to increase both capacitance and dissipation factor.
    At higher AC voltages, both capacitance and dissipation factor
    begin to decrease.
    Typical curves showing the effect of applied AC and DC
    voltage are shown in Figure 6 for KEMET X7R capacitors and
    Figure 7 for KEMET Z5U capacitors.
    Effect of Frequency:
     Frequency affects both capaci-
    tance and dissipation factor. Typical curves for KEMET multi-
    layer ceramic capacitors are shown in Figures 8 and 9.
    T
    he variation of impedance with frequency is an impor-
    tant consideration in the application of multilayer ceramic
    capacitors. Total impedance of the capacitor is the vector of the
    capacitive reactance, the inductive reactance, and the ESR, as
    illustrated in Figure 2. As frequency increases, the capacitive
    reactance decreases. However, the series inductance (L)
    shown in Figure 1 produces inductive reactance, which
    increases with frequency. At some frequency, the impedance
    ceases to be capacitive and becomes inductive. This point, at
    the bottom of the V-shaped impedance versus frequency
    curves, is the self-resonant frequency. At the self-resonant fre-
    quency, the reactance is zero, and the impedance consists of
    the ESR only.
    Typical impedance versus frequency curves for KEMET
    multilayer ceramic capacitors are shown in Figures 10, 11, and
    12. These curves apply to KEMET capacitors in chip form, with-
    out leads. Lead configuration and lead length have a significant
    impact on the series inductance. The lead inductance is
    approximately 10nH/inch, which is large compared to the
    inductance of the chip. The effect of this additional inductance
    is a decrease in the self-resonant frequency, and an increase
    in impedance in the inductive region above the self-resonant
    frequency.
    Effect of Time:
     The capacitance of Class II and III
    dielectrics change with time as well as with temperature, volt-
    age and frequency. This change with time is known as “aging.”
    It is caused by gradual realignment of the crystalline structure
    of the ceramic dielectric material as it is cooled below its Curie
    temperature, which produces a loss of capacitance with time.
    The aging process is predictable and follows a logarithmic
    decay. Typical aging rates for C0G, X7R, and Z5U dielectrics 
    are as follows:
    C0G
    X7R
    Z5U
    None
    1.0% per decade of time
    5.0% per decade of time
    Typical aging curves for X7R and Z5U dielectrics are
    shown in Figure 13.
    The aging process is reversible. If the capacitor is heat-
    ed to a temperature above its Curie point for some period of
    time, de-aging will occur and the capacitor will regain the
    capacitance lost during the aging process. The amount of de-
    aging depends on both the elevated temperature and the
    length of time at that temperature. Exposure to 150°C for one-
    half hour or 125°C for two hours is usually sufficient to return
    the capacitor to its initial value.
    Because the capacitance changes rapidly immediately
    after de-aging, capacitance measurements are usually delayed
    for at least 10 hours after the de-aging process, which is often
    referred to as the “l(fā)ast heat.” In addition, manufacturers utilize
    EFFECT OF APPLIED VOLTAGE
    0.1
    1
    10
    100
    AC or DC Volts Applied
    Typical Effects of 1000 Hz AC and DC Voltage Level on
    Capacitance and Dissipation Factor - Z5U
    Note: C0G Dielectric capacitance and dissipation factor are
    stable with voltage.
    Figure 7.
    1
    2
    3
    4
    +20
    0
    -20
    -40
    -60
    1
    2
    3
    4
    +10
    +5
    0
    -5
    -10
    0.1
    1
    10
    100
    AC or DC Volts Applied
    Typical Effects of 1000 Hz AC and DC Voltage Level on
    Capacitance and Dissipation Factor - X7R
    Note: C0G Dielectric capacitance and dissipation factor are
    stable with voltage.
    Figure 6.
    DC
    AC
    AC
    DC
    %
    %
    %
    %
    DC
    AC
    AC
    DC
    
    
    
    
    
    


    


    

    相關(guān)PDF資料
    		

    PDF描述
    		

    
    

    
C192G102D5CH5CP
MILITARY SPECIFCATIONS ON BACK

    

    
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MILITARY SPECIFCATIONS ON BACK

    

    
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    相關(guān)代理商/技術(shù)參數(shù)
    		

    參數(shù)描述
    		

    
    

    
C192G102D5CH5CP
 制造商:KEMET 制造商全稱(chēng):Kemet Corporation 功能描述:MILITARY SPECIFCATIONS ON BACK

    

    
C192G102D5CJ5CA
 制造商:KEMET 制造商全稱(chēng):Kemet Corporation 功能描述:MILITARY SPECIFCATIONS ON BACK

    

    
C192G102D5CJ5CM
 制造商:KEMET 制造商全稱(chēng):Kemet Corporation 功能描述:MILITARY SPECIFCATIONS ON BACK

    

    
C192G102D5CJ5CP
 制造商:KEMET 制造商全稱(chēng):Kemet Corporation 功能描述:MILITARY SPECIFCATIONS ON BACK

    

    
C192G102D5CK5CA
 制造商:KEMET 制造商全稱(chēng):Kemet Corporation 功能描述:MILITARY SPECIFCATIONS ON BACK

    

    
    
    
    
	
    	
    
    
     
     
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