SPX1086 データシートの表示（PDF） - Signal Processing Technologies

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SPX1086

1.5A Low Dropout Voltage Regulator Adjustable & Fixed Output, Fast Response

Signal Processing Technologies 

Basic Adjustable Regulator

V IN

SPX1086

VREF

I

ADJ

50µA

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

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.

RP Parasitic Line

Resistance

VIN

SPX1086

Connect R 1 to

Case of Regulator

R1

RL

R2

Connect R 2 to Load

Fig.3 Basic Adjustable Regulator

SPX1086

Rev. 11/2/00

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