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SPX1587R-2.5 Datasheet(PDF) 4 Page - Sipex Corporation

Part # SPX1587R-2.5
Description  3A Low Dropout Voltage Regulator Adjustable & Fixed Output, Fast Response
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SPX1587R-2.5 Datasheet(HTML) 4 Page - Sipex Corporation

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Rev. 10/30/00
SPX1587
Basic Adjustable Regulator
Output Voltage
Consider Figure 2. The resistance R1 generates a constant
current flow, normally the specified load current of 10mA.
This current will go through the resistance R2 to set the overall
output voltage. The current IADJ is very small and constant.
Therefore its contribution to the overall output voltage is very
small and can generally be ignored.
Load Regulation
Parasitic line resistance can degrade load regulation. In order
not to affect the behavior of the regulator, it is best to connect
directly the R1 resistance from the resistor divider to the case,
and not to the load. For the same reason, it is best to connect
the resistor R2 to the Negative side of the load.
Output Voltage
The fixed voltage LDO voltage regulators are simple to use
regulators since the VOUT is preset to the specifications. It is
important however, to provide the proper output capacitance
for stability and improvement. For most operating conditions
a capacitance of 22uF tantalum or 100uF electrolytic will
ensure stability and prevent oscillation.
SPX1587
Fig.2 Basic Adjustable Regulator
VOUT
V
IN
V
REF
R1
R2
V
OUT = VREF * ( 1 + R2/R1) + IADJ * R2
I
ADJ
50µA
SPX1587
Fig.3 Basic Adjustable Regulator
V
IN
R
2
R
1
Connect R
2 to Load
R
L
Connect R
1 to
Case of Regulator
R
P Parasitic Line
Resistance
SPX1587
Basic Fixed Regulator
V
IN
V
OUT
5V
C1
10uF
C2
10uF
3.3V


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