www.vishay.com

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).

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:

at the specified frequency.

P

P

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

(Watts)

in free air

R

S