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參數(shù)資料
| 型號(hào)： | SPX5205M5-4.0 |
| 英文描述： | 150 mA, Low-Noise LDO Voltage Regulator |
| 中文描述： | 150毫安低噪聲LDO穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 4/9頁(yè) |
| 文件大?。?/td> | 181K |
| 代理商： | SPX5205M5-4.0 |
Rev. 10/24/00
V
OUT
GND
SPX5205
Top View
EN
BYP
(Optn)
V
IN
+
+
Fig. 1
1
2
3
5
4
Hi-ON
Lo-OFF
SPX5205
Application Hints
The SPX5205 requires an output capacitor for device stability.
The value required varies greatly depending upon the
application circuit. The high frequency characteristics of
electrolytic capacitors depend greatly on the type and also on
the manufacturer. Sometimes bench testing is the only means
to determine the proper capacitor type and value. The high
quality 2.2
μ
F aluminum electrolytic capacitor covers all
general application circuits; this stability can be obtained with
a tantalum electrolytic value of 1
μ
F.
In general, linear regulator stability decreases with higher
output currents. In most applications the SPX5205 is
operating at few milliamps. In these applications the output
capacitance can be further reduced. For example, when the
regulator is running at 10mA output current the output
capacitance value is half compared to the same regulator
that is running at 150mA.
With the SPX5205 adjustable regulator, the minimum value
of output capacitance is a function of the output voltage.
The value decreases with higher output voltages, since the
closed loop gain is increased.
Typical Applications Circuits
The SPX5205 provides access to the internal reference. A 10
μ
F capacitor on the BYP pin will provide a significant reduction in
output noise. This pin may be left unconnected if the output noise is not a major concern. The SPX5205 start-up speed is inversely
proportional to the size of this capacitor. Applications requiring a slow ramp-up of output voltage should consider larger values of
C
BYP
. If the rapid turn-ON is necessary, omit bypass capacitor.
Figure 1 shows SPX5205 standard application circuit. The EN pin is pulled high (>2.0V) to enable the regulator. To disable the
regulator, EN < 0.6V.
The SPX5205 in figure 2 shows adjustable output voltage configuration. Two resistors set the output voltage. The formula for output
voltage is:
Resistor values are not critical as the ADJ pin has high input impedance, for best results use resistors of 47k
or less. A capacitor
from ADJ to ground will provide improved noise performance.
Top View
V
IN
V
OUT
GND
EN
Byp
(Optn)
+
+
ADJ
R1
R2
Fig. 2
Hi-ON
Lo-OFF
1
2
3
4
5
SPX5205
R1
R2
V
OUT
= 1.235 x 1+
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SPX5205M5-5.0 | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:150 mA, Low-Noise LDO Voltage Regulator |
| SPX5205M5-50 | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:150mA, Low-Noise LDO Voltage Regulator |
| SPX5205M5-5-0 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SPX5205M5-50/TR | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:150mA, Low-Noise LDO Voltage Regulator |
| SPX5205M5-5-0/TR | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
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