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550D107X0020S2 Datasheet(PDF) 8 Page - Vishay Siliconix

Part # 550D107X0020S2
Description  Solid-Electrolyte TANTALEX Capacitors for High Frequency Power Supplies
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Manufacturer  VISHAY [Vishay Siliconix]
Direct Link  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

550D107X0020S2 Datasheet(HTML) 8 Page - Vishay Siliconix

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31
550D
Vishay Sprague
Document Number: 40017
Revision 11-Nov-04
For technical questions, contact tantalum@vishay.com
2.
A-C Ripple Voltage: The maximum allowable
ripple voltage shall be determined by the formula:
or, from the formula:
where
P=
Power Dissipation in Watts @ + 25°C as
given in the table in Paragraph Number 5
(Power Dissipation).
RESR = The capacitor Equivalent Series Resistance
at the specified frequency.
Z=
The capacitor impedance at the specified
frequency.
2.1
The sum of the peak AC voltage plus the DC voltage
shall not exceed the DC voltage rating of the capacitor.
2.2
The sum of the negative peak AC voltage plus the
applied DC voltage shall not allow a voltage reversal
exceeding 15% of the DC working voltage at + 25°C.
5.
Power Dissipation: The figures shown relate to an
approximate + 20°C rise in case temperature
measured in free air. Power dissipation will be affected
by the heat sinking capability of the mounting surface.
Non-sinusoidal ripple current may produce heating
effects which differ from those shown. It is important
that the equivalent
Irms value be established when
calculating permissable operating levels.
1.
A-C Ripple Current: The maximum allowable ripple
current shall be determined from the formula:
P=
Power Dissipation in Watts @ + 25°C as given in
the table in Paragraph Number 5 (Power
Dissipation).
GUIDE TO APPLICATION
3.
Reverse Voltage: These capacitors are capable of
withstanding peak voltages in the reverse direction
equal to 15% of the DC rating at + 25°C, 10% of the
DC rating at + 55°C; 5% of the DC rating at +85°C.
4.
Temperature Derating: If these capacitors are to be
operated at temperatures above + 25°C, the
permissible rms ripple current or voltage shall be
calculated using the derating factors as shown:
RESR = The capacitor Equivalent Series Resistance
at the specified frequency.
Vrms = Irms x Z
Vrms = Z
P
RESR
P
RESR
Irms =
Temperature
Derating
Factor
+ 25°C
+ 55°C
+ 85°C
+ 125°C
1.0
0.8
0.6
0.4
0.185
0.225
Case
Code
Maximum Permissible
Power Dissipation
@ + 25
°C
(Watts)
in free air
R
S


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