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參數(shù)資料
| 型號： | GR500 |
| 廠商： | KEMET Corporation |
| 英文描述： | HIGH RELIABILITY SOLID TANTALUM |
| 中文描述： | 高可靠性固體鉭 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 686K |
| 代理商： | GR500 |
GR500/T240
KEMET Electronics Corporation P.O. Box 5928 Greenville, S.C. 29606 864/963-6300
15
KEMET
APPLICATIONS INFORMATION GR500/T240 (Continued)
AC Ripple —
Permissable AC ripple voltage is related to
the rated voltage, the ESR of the capacitor, and the power
dissipation capability of a particular case size:
1. The positive peak AC voltage plus the DC bias
voltage (if any), must not exceed the rated voltage.
2. The negative peak AC voltage, in combination
with the bias voltage (if any), must not exceed that
allowable (see Reverse Voltage).
3. The power dissipated in the equivalent series
resistance of the capacitor must not exceed the
limits specified in Table III.
The power dissipated may be calculated from the
following:
Where E = ripple voltage across capacitor in rms volts
Z = capacitor impedance in ohms at the specified
frequency.
R = equivalent series resistance in ohms
Ripple voltage, as limited by power dissipation, may be
determined as follows:
Where P max=maximum permissible power from
Table III
Z = Impedance
R = ESR
E max (85°C) = 0.9 E max (25°C)
E max (125°C) = 0.4 E max (25°C)
TABLE III
Maximum Permissible Power Dissipation at 25°C Ambient
Case Size
A
B
C
D
Watts
0.090
0.100
0.125
0.180
Reverse Voltage —
The solid tantalum capacitor is a polar
device and can be damaged by serious reversals of polarity
even for short periods of time. However, some short duration
reversal is permissable as shown in Table IV.
TABLE IV
Permissible Reverse Voltage
Temp.
°C
25
85
125
% of Forward
Rated Voltage
15
5
1
Surge Current —
Surge current testing is performed to pro-
vide resistance from damage due to circuit transients. This
test, employing total DC circuit resistance of 1.0 max, exclu-
sive of the capacitor, is described on Page 21.
Shelf Life —
Shelf life is particularly difficult to define for
the solid tantalum capacitor. Extended periods of storage at
high temperature will cause some small change in leakage
current which usually returns to normal upon short time
application of working voltage. Storage at low temperatures
causes little or no degradation of leakage current. Long-term
studies of capacitance and dissipation factor shift for as long
as 45,000 hours indicate only minor variations (usually less
than 2%) in these parameters.
Installation —
Mounting procedures should not place
undue strain on terminals, particularly the positive end with
its glass-metal seal. Attention to soldering technique should
avoid excessive heat transfer which might remelt the capac-
itor’s internal solder and cause loss of hermeticity or short
circuits. Potting materials should not produce excessive cur-
ing exotherms or shrinkage pressures.
P =
E
2
R
Z
2
E max (25°C) = Z
P max
R
Fig. 6 Typical Behavior of Impedance and ESR as a function
of frequency @ 25°C
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