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參數(shù)資料
| 型號： | SPX1121 |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 150mA Low Dropout Voltage Regulator |
| 中文描述： | 150mA的低壓差穩(wěn)壓器 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 81K |
| 代理商： | SPX1121 |
Rev. 10/11/02
SPX1121 150mA Low DropoutVoltage Regulator
Copyright 2002 Sipex Corporation
6
EXTERNAL CAPACITORS
The stability of the SPX1121 requires a 1
μ
F or
greater capacitor between output and ground.
Oscillation could occur without this capacitor.
Most types of tantalum or aluminum electro-
lytic works fine here. For operations below -
25
°
C solid tantalum is recommended since the
many aluminum types have electrolytes that
freeze at about -30
°
C. The ESR of about 5
or
less and resonant frequency above 500kHz are
the most important parameters in the value of
the capacitor. The capacitors value may be in-
creased without limit.
The SPX1121 unlike other low dropout regula-
tors will remain stable and in regulation with no
load in addition to the internal voltage divider.
This feature is especially important in applica-
tions like CMOS RAM keep-alive.
If there is more than 10 inches of wire between
the input and the AC filter capacitor or if a
battery is used as the input then a 0.1
μ
F tantalum
or aluminum electrolytic capacitor should be
placed from the input to the ground.
REDUCING OUTPUT NOISE
It may be an advantage to reduce the AC noise
present at the output. One way is to reduce the
regulator bandwidth by increasing the size of
the output capacitor. Increasing the capacitor
from 1
μ
F to 220
μ
F decreases the noise from
430
μ
V to 160
μ
VRMS for a 100kHz bandwidth
at 5V output.
APPLICATIONS HINTS
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SPX1121N | 150mA Low Dropout Voltage Regulator |
| SPX1121N-3.3 | 150mA Low Dropout Voltage Regulator |
| SPX1121N-5.0 | 150mA Low Dropout Voltage Regulator |
| SPX1121M3 | 150mA Low Dropout Voltage Regulator |
| SPX1121S | 150mA Low Dropout Voltage Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SPX1121_05 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:150mA Low Dropout Voltage Regulator |
| SPX1121M3 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:150mA Low Dropout Voltage Regulator |
| SPX1121M3-2.5 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:150mA Low Dropout Voltage Regulator |
| SPX1121M3-3.3 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:150mA Low Dropout Voltage Regulator |
| SPX1121M3-3-3 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:150mA Low Dropout Voltage Regulator |
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