TK11320B Ver la hoja de datos (PDF) - Toko America Inc
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TK11320B Datasheet PDF : 13 Pages
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TK113xx B
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
INPUT-OUTPUT CAPACITORS
Linear regulators require an output capacitor in order to maintain regulator loop stability. This capacitor should be selected
to insure stable operation over the desired temperature and load range. The graphs below show the effects of capacitance
value and equivalent series resistance (ESR) on the stable operation area.
113xxB
CL
2.0 V
3.0 V
5.0 V
1000
100
10
1
CL = 1 µF
STABLE
OPERATION
AREA
CL = 2.2 µF
1000
100
10
STABLE
OPERATION
AREA
1
CL = 3.3 µF
1000
100
10
STABLE
OPERATION
AREA
1
CL = 10 µF
1000
100
10
STABLE
OPERATION
AREA
1
0.1
0.1
0.1
0.1
0 .01
Q1
50
100
IOUT (mA)
0.01
150
Q1
50
100
IOUT (mA)
0.01
150
Q1
50
100
IOUT (mA)
0.01
150
Q1
50
100
150
IOUT (mA)
In general, the capacitor should be at least 1 µF (Aluminum electrolytic) and be rated for the actual ambient operating
temperature range. The table below shows typical characteristics for several types and values of capacitance. Please note
that the ESR varies widely depending upon manufacturer, type, size, and material.
ESR AlumEinSuRm
Capacitor
Capacitance
Tantalum
Capacitor
ESR
1.0 µF
2.2
3.3
ES
10.0
2.4 Ω
2.0 Ω
4.6 Ω
1.4 Ω
2.3 Ω
1.9 Ω
1 .0 Ω
0.5 Ω
Note: ESR is measured at 10 KHz.
Ceramic
Capacitor
0.14 Ω
0.059 Ω
0.049 Ω
0.025 Ω
Page 10
May, 1997 TOKO, Inc.
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