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參數(shù)資料
| 型號(hào)： | SPX5205M5-50 |
| 英文描述： | 150mA, Low-Noise LDO Voltage Regulator |
| 中文描述： | 150mA的，低噪聲LDO穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 189K |
| 代理商： | SPX5205M5-50 |
6
Date:12/
1
8
/04 SPX5205 150mA, Low Noise LDO Voltage Regulator
Copyright 2004 Sipex Corporation
+
+
GND
EN
BYP
(Optn)
Hi-ON
Lo-OFF
SPX5205
1
2
3
4
5
V
IN
V
OUT
R1
R2
ADJ
TOP View
Figure 1. Typical Adjustable Output Voltage.
APPLICATION INFORMATION
The SPX5205 requires an output capacitor for
device stability. Its value depends upon the
application circuit. In general, linear regulator
stability decreases with higher output currents.
In applications where the SPX5205 is putting
out less current, a lower output capacitance may
be sufficient. For example, a regulator sourcing
only 10mA, requires approximately half the
capacitance as the same regulator sourcing
150mA.
Bench testing is the best method for determining
the proper type and value of the capacitor since
the high frequency characteristics of electro-
lytic capacitors vary widely, depending on type
and manufacturer. A high quality 2.2
μ
F alumi-
num electrolytic capacitor works in most appli-
cation circuits, but the same stability often can
be obtained with a 1
μ
F tantalum electrolytic.
With the SPX5205 adjustable version, the mini-
mum value of output capacitance is a function of
the output voltage. The value decreases with
higher output voltages, since closed loop gain is
increased.
Typical Applications Circuits
A 10nF capacitor on BYP pin will significantly
reduce output noise but it may be left uncon-
nected if the output noise is not a major concern.
The SPX5205 start-up speed is inversely pro-
portional to the size of the BYP capacitor. Ap-
plications requiring a slow ramp-up of the out-
put voltage should use a larger C
BYP
. However,
if a rapid turn-on is necessary, the BYP capaci-
tor can be omitted.
The SPX5205’s internal reference is available
through the BYP pin.
The Typical Application Circuit shown on page
1 represents a SPX5205 standard application
circuit. The EN (enable) pin is pulled high
(>2.0V) to enable the regulator. To disable the
regulator, EN < 0.4V.
The SPX5205 in Figure 1 illustrates a typical
adjustable output voltage configuration. Two
resistors (R1 and R2) set the output voltage. The
output voltage is calculated using the formula:
V
OUT
= 1.235V x ( 1 + R1/R2)
R2 must be > 10 k
and for best results, R2
should be between 22 k
and 47k
. A capacitor
placed between adjustable and ground will pro-
vide improved noise performance.
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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: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: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: |
| SPX5205M5-L | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V-16V 150mA RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| SPX5205M5-L | 制造商:Exar Corporation 功能描述:Regulator |
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