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參數(shù)資料
| 型號： | R1111N4.21BTR |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 140K |
| 代理商： | R1111N4.21BTR |
Rev.1.11
- 15 -
I
TECHNICAL NOTES
When using these ICs, consider the following points:
In these ICs, phase compensation is made for securing stable operation even if the load current is varied. For this purpose, be
sure to use a capacitor COUT with good frequency characteristics and ESR (Equivalent Series Resistance) of which is in the
range described as follows:
V
OUT
I
OUT
V
IN
V
IN
CE
GND
ESR
R1111N301B
S.A.
3
1
2
5
Ceramic Capacitor
1
μ
F
Ceramic
Capacitor
Spectrum
Analyzer
Measuring Circuit for white noise;R1111N301B
The relations between I
OUT
(Output Current) and ESR of Output Capacitor are shown below. The conditions when the white
noise level is under 40
μ
V(Avg.) are marked as the hatched area in the graph.
(note: When the additional ceramic capacitors are connected to the Output Pin with Output capacitor for phase
compensation, the operation might be unstable. Because of this, test these ICs with as same external components as ones to
be used on the PCB.)
<measuring conditions>
(1) VIN=4V
(2) Frequency band :10Hz to 1MHz
(3) Temperature : 25
°
C
R1111N301B
Ceramic 1.0
μ
F
R1111N301B
Ceramic 2.2
μ
F
100.0
10.0
1.0
0.1
0
100
50
150
Output Current I
OUT
(mA)
E
)
100.0
10.0
1.0
0.1
Output Current I
OUT
(mA)
0
100
50
150
E
)
Make V
DD
and GND line sufficient. When the impedance of these is high, the noise might be picked up or not work
correctly.
Connect the capacitor with a capacitance of 1
μ
F or more between V
DD
and GND as close as possible.
Set external components, especially Output Capacitor, as close as possible to the ICs and make wiring shortest.
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