SPX2931(2004) Просмотр технического описания (PDF) - Signal Processing Technologies
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SPX2931 Datasheet PDF : 8 Pages
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2.0
1.6
1.2
0.8
0.4
0.0
0 10 20 30 40 50 60 70 80 90
AMBIENT TEMPERATURE (ºC)
Figure 7. Maximum Power Dissipation (SOT89)
TYPICAL PERFORMANCE CHARACTERISTICS
1.0
0.9
0.8
0.7
0.6
0.125" LEAD LENGTH
FROM PC BOARD
0.5
0.4
0.4" LENGTH
0.3
FROM PC BOARD
0.2
0.1
0
0 10 20 30 40 50 60 70 80 90
AMBIENT TEMPERATURE (ºC)
Figure 8. Maximum Power Dissipation (TO-92)
10 LM2931-
5.0
IO = 10mA
1
0.1
0.01
0
30 60 90
FREQUENCY (Hz)
120 150
Figure 9. Output Impedance
OPERATION DURING LOAD DUMP
70
60
50
40
30
20
10
0 ~~
6
C O = 100µF
~~
RL = 500 Ω
4
2
0
-2
-100 0
100 200 300 400 500
TIME (ms)
Figure 10. Operation During Load Dump
APPLICATION INFORMATION
The SPX2931 requires an output capacitor for
device stability. The value required varies greatly
depending upon the application circuit and other
factors. The high frequency characteristics of
electrolytic capacitors depend greatly on the
type and also on the manufacturer. Sometimes
bench testing is the only means to determine the
proper capacitor type and value. The high qual-
ity 100°F aluminum electrolytic covers all gen-
eral application circuits, this stability can be
obtained with a tantalum electrolytic value of
47°F.
Another critical point of electrolytic character-
istics is its performance over temperature. The
SPX2931 is designed to operate starting at -
40°C which may not be true in the case of
electrolytic. Higher temperatures generally no
problem. The electrolytic. type in aluminum
will freeze around -30°C. This could cause an
oscillation at output of regulator. At a lower
temperature requirement by many applications
the capacitor should maintain its performance.
So as a result, for an application which regulator
junction temperature does not exceed 25°C, the
output capacitor can be reduced by the factor of
two over the value needed for the entire tem-
perature range.
Date: 05/25/04
SPX2931 100mA Low Dropout Voltage Regulator
4
© Copyright 2004 Sipex Corporation
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