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ESZ336M200AH4AA 数据表(PDF) 11 Page - Kemet Corporation

部件名 ESZ336M200AH4AA
功能描述  Single-Ended Aluminum Electrolytic Capacitors
Download  19 Pages
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制造商  KEMET [Kemet Corporation]
网页  http://www.kemet.com
标志 KEMET - Kemet Corporation

ESZ336M200AH4AA 数据表(HTML) 11 Page - Kemet Corporation

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© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 • 864-963-6300 • www.kemet.com
A4062_ESZ • 1/27/2017
Single-Ended Aluminum Electrolytic Capacitors – ESZ Series, +105°C
Impedance (Z)
Impedance of an electrolytic capacitor results from a circuit formed by the following individual equivalent series
components:
Equivalent
Capacitance
C o
R e
L
C e
C
o
R
e
L
C
e
C
o = Aluminum oxide capacitance (surface and thickness of the dielectric)
R
e = Resistance of electrolyte and paper mixture (other resistances not depending on the frequency are not considered: tabs,
plates, etc.)
C
e = Electrolyte soaked paper capacitance
L = Inductive reactance of the capacitor winding and terminals
Impedance of an electrolytic capacitor is not a constant quantity that retains its value under all conditions; it changes
depending on frequency and temperature.
Impedance as a function of frequency (sinusoidal waveform) for a certain temperature can be represented as follows:
C o
R e
L
C e
0.1
1
10
100
1,000
10,000
0.1
1
10
100
1,000
Z [ohm]
F [K Hz]
B
C
A
1/ω
ω
ω
ω C o
R e
1/ω
ω
ω
ω C e
ωL
• Capacitive reactance predominates at low frequencies
• With increasing frequency, capacitive reactance Xc = 1/ωC
o decreases until it reaches the order of magnitude of
electrolyte resistance R
e(A)
• At even higher frequencies, resistance of the electrolyte predominates: Z = R
e (A - B)
• When the capacitor’s resonance frequency is reached (ω
0), capacitive and inductive reactance mutually cancel each other
1/ωC
e = ωL, ω0 = C√1/LCe
• Above this frequency, inductive reactance of the winding and its terminals (XL = Z = ωL) becomes effective and leads to
an increase in impedance
Generally speaking, it can be estimated that C
e ≈ 0.01 Co.


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