SPX1585AT-LSLASHTR datasheet(4/7 Pages) EXAR

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SPX1585

Basic Adjustable Regulator

Output Voltage

Consider Figure 2. The resistance R1generates 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.

SPX1585

Fig.2 Basic Adjustable Regulator

REF

OUT = VREF * ( 1 + R2/R1) + IADJ * R2

ADJ

VOUT

50uA

SPX1585

Fig.3 Basic Adjustable Regulator

Connect R 2 to Load

Connect R 1 to

Case of Regulator

RP Parasitic Line

Resistance

OUT

ADJ

SPX1585

Basic Fixed Regulator

OUT

10uF

3.3V

4/7

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