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參數(shù)資料
| 型號(hào)： | R1121NXXXX |
| 英文描述： | Power Management ICs |
| 中文描述： | 電源管理IC |
| 文件頁數(shù)： | 15/17頁 |
| 文件大?。?/td> | 154K |
| 代理商： | R1121NXXXX |
Rev.1.11
- 15 -
I
TECHNICAL NOTES
When using these ICs, be sure to consider following points:
l
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 C
OUT
with good frequency characteristics and
ESR (Equivalent Series Resistance) of which is in the range described
as follows:
Measuring Circuit for white noise ; R1121N301B
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) V
IN
= 4V
(2) Frequency band :10Hz to 1MHz
(3) Temperature : 25
°
C
R1121N301B
R1121N301B
l
Make V
DD
and GND line sufficient. When the impedance of these is high, there is a case to pick up the noise or not to work
correctly.
Connect the capacitor with a capacitance of 1
μ
F or more between V
DD
and GND as close as possible.
l
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