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AP1155ADU Datasheet(PDF) 16 Page - Asahi Kasei Microsystems

Part No. AP1155ADU
Description  15V Input / 1A Output Adjustable Voltage LDO Regulator
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Maker  AKM [Asahi Kasei Microsystems]
Homepage  http://www.akm.com
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AP1155ADU Datasheet(HTML) 16 Page - Asahi Kasei Microsystems

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[AP1155ADU]
Rev.0.0
- 16 -
2014/07
11.7
Stability
The standard capacitor recommended for use on the output side is a ceramic capacitor equal to or greater than
1.0F. For operations at 2.4V or less, use at least a 2.2F capacitor.
I
Out [mA]
0
200
400
600
800
1000
0.01
0.1
1
10
100
Unstable Area
Stable Area
Figure 2. Stable operation area when VOut,TYP=3.0V
The above graph indicates that operation is stable in the entire current range with a resistance of 1 or less
(equivalent series resistance or ‘ESR’) connected in series to the output capacitor. Generally, the ESR of a
ceramic capacitor is very low (several tens of m), and no problems should arise in actual use. If an
application requires use of a large ESR capacitor, connecting a ceramic capacitor with low ESR in parallel will
enable operations at this level. When parallel output capacitors are used, be sure to position the ceramic
capacitor as close to the IC as possible. The other capacitor connected in parallel may be located away from
the IC. The IC will not be damaged by the increased capacitance. Input capacitors are necessary when the
power supply impedance increases due to battery depletion or when the line to the power supply is particularly
long. There is no general rule that can be used to determine the required number of capacitors used for such
purposes. In some cases, only one capacitor is necessary for several regulator ICs. In some cases, one capacitor
is required for each IC. To determine the required number of capacitors in a specific application, be sure to
verify operation with all parts in the installed configuration.
12
50
Bias Voltage(V)
100
Ta(°C)
Capacitance vs Voltage
Capacitance vs Temperature
B Curve
F Curve
10
8
6
4
2
0
60
70
80
90
100
B Curve
F Curve
75
50
25
0
-25
-50
50
60
70
80
90
100
Figure 3. General characteristics of ceramic capacitors
Ceramic capacitors normally have specific temperature and voltage characteristics. Be sure to take the
operating voltage and temperature into consideration when selecting parts for use. We recommend parts
featuring B characteristics.
For evaluation
Kyocera : CM05B104K10AB , CM05B224K10AB ,CM105B104K16A ,CM105B224K16A ,CM21B225K10A
Murata : GRM36B104K10 , GRM42B104K10 ,GRM39B104K25 , GRM39B224K10 , GRM39B105K6.3


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