www.johanson-caps.com
10
1
I
MPEDANCE VS
FREQUENCY (TYPICAL)
The left-hand portion of the curves represents the capaci-
tive reactance of two typical values. The impedance
decreases until series resonance is reached. At this point
(the bottom of the V), the only component of the imped-
ance is the ESR. At higher frequencies (the inductive
portion) the ESR remains relatively low so that effective
filtering is maintained.
0.1
X C
X L
270 µF
10 µF
0.01
0.001
0.001
0.01
0.1
Frequency (MHz)
1
10
10
10
1
0.1
ESR VS FREQUENCY (TYPICAL)
These curves reflect the very low ESR of two typical
values. These ESRs are much lower than Tantalums or
Aluminum electrolytics of the same values. The result is
the ability to provide filtering (low loss) and to handle
high power requirements.
0.01
10 µF
0.001
0.0001
270 µF
0.001
0.01
0.1
Frequency (MHz)
1
1000
100
10
R
IPPLE
C
URRENT VS
FREQUENCY (TYPICAL)
Here are two examples of the ability of Switchmode
capacitors to handle high values of ripple current (high
power) at various frequencies. Refer to the "AC Power
Computations" applications note or contact Johanson
Applications Engineering for more information.
P56, 270 µF
P03, 10 µF
1
0.001
0.01
0.1
1
Frequency (MHz)
SOLDERING
PRECAUTIONS
The large ceramic mass of switch mode capacitors increases their susceptibility to damage from thermal shock during
soldering. Parts should be pre-heated to within 50°C of the peak soldering temperature and the pre-heating cycle’s
thermal gradient should be limited to a maximum of 2°C per second.
13
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JOHANSON [ JOHANSON TECHNOLOGY INC. ]
