SPX1587 datasheet(4/7 Pages) SIPEX

4 / 7 page

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

REF

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

ADJ

50µA

SPX1587

Fig.3 Basic Adjustable Regulator

Connect R

2 to Load

Connect R

1 to

Case of Regulator

P Parasitic Line

Resistance

SPX1587

Basic Fixed Regulator

OUT

10uF

3.3V

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