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NJM317

ADJUSTABLE 3-TERMINAL POSITIVE VOLTAGE REGULATOR

Japan Radio Corporation  

NJM317

■ TYPICAL APPLICATIONS

1) VO = 1.25V to 37V Adjustable Voltage Regulator

VO = VREF x

1+ R2 

 R1 

+ R2 x IADJ

2) Selected Output Voltage

Selective Signal Inputs

3) Regulater with Protection Diodes

The transistors Q3 are switched by

selective signal inputs and the output

voltage VO is controlled by the transistor on

or off.

(Example)

When all transistor is off,

VO ·=· VREF x

1+ R2 

 R1 

When the transistor Q3 is on, and others

are off.

VO ·=· VREF x

1 +



R2 × R3 

(R2

+

R3)

×

R1





*IADJ ignore.

D1 protects about CO

D2 protects about CADJ

-4-

Ver.2003-07-18

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