TK11213B 查看數據表（PDF） - Toko America Inc
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TK11213B Datasheet PDF : 24 Pages
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TK112xxB
APPLICATION INFORMATION
INPUT-OUTPUT CAPACITORS
Linear regulators require an output capacitor in order to maintain regulator loop stability. This capacitor should be selected
to ensure stable operation over the desired temperature and load range. The graphs below show the effects of
capacitance value and ESR on the stable operation area.
112xxB
CL
ESR
VOUT =
2.0 V
3.0 V
5.0 V
CL = 1 µF
1000
100
10
STABLE
OPERATION
AREA
1
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 .01
1
0.1
50
100
IOUT (mA)
0.01
150
1
0.1
0.1
50
100
IOUT (mA)
150
0.01
1
50
100
IOUT (mA)
150
0.01
1
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
Capacitance
1.0 µF
2.2 µF
3.3 µF
10 µF
Aluminum
Capacitor
2.4 Ω
2.0 Ω
4.6 Ω
1.4 Ω
Tantalum
Capacitor
2.3 Ω
1.9 Ω
1.0 Ω
0.5 Ω
Ceramic
Capacitor
0.140 Ω
0.059 Ω
0.049 Ω
0.025 Ω
Note: ESR is measured at 10 kHz.
Page 18
October 1999 TOKO, Inc.
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