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参数资料
| 型号： | R1140Q21B-TR |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | FIXED POSITIVE LDO REGULATOR, PDSO4 |
| 封装： | MINI, PLASTIC, SC-82AB, 4 PIN |
| 文件页数： | 11/15页 |
| 文件大小： | 404K |
| 代理商： | R1140Q21B-TR |
Rev. 1.00
- 5 -
n TECHNICAL NOTES
When using these ICs, consider the following points:
Phase Compensation
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 2.2
mF or more capacitor COUT with good frequency characteristics and ESR (Equivalent Series Resistance).
(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.)
PCB Layout
Make VDD and GND line sufficient. When the impedance of these is high, it would be a cause of picking up the noise or
unstable operation. Connect a capacitor with as much as 1.0
mF capacitor between VDD and GND pin as close as possible.
Set external components, especially output capacitor as close as possible to the ICs and make wiring shortest.
n TEST CIRCUITS
C2 = Tantal2.2
mF
*
C1 = Tantal1.0
mF
C1
V
OUT
C2
GND
CE
V OUT
VDD
3
4
R1140Q
SERIES
I
OUT
1
2
V
Fig.1 Standard test Circuit
C2 = Tantal2.2
mF
*
C1 = Tantal1.0
mF
A
I
SS
C1
C2
GND
CE
VOUT
V DD
3
4
R1140Q
SERIES
1
2
Fig.2 Supply Current Test Circuit
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相关代理商/技术参数 |
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| R1140Q221B-TL | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Positive Fixed Voltage Regulator |
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