SPX1585U View Datasheet(PDF) - Signal Processing Technologies

Part Name

Description

Manufacturer

SPX1585U

5A Low Dropout Voltage Regulator Adjustable & Fixed Output, Fast Response

Signal Processing Technologies 

SPX1585

Basic Adjustable Regulator

VIN

SPX1585

ADJ

VREF

IADJ

50uA

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

VOUT

R1

R2

Fig.2 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

RP Parasitic Line

VIN

SPX1585

Resistance

VOUT

ADJ

Connect R 1 to

Case of Regulator

R1

RL

R2

Connect R 2 to Load

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.

VIN

5V

C1

10uF

SPX1585

VOUT

3.3V

C2

10uF

Basic Fixed Regulator

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.

Fig.3 Basic Adjustable Regulator

Rev. 10/23/00

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