LM317 datasheet(4/10 Pages) TI | 3-TERMINAL ADJUSTABLE REGULATOR

Nombre de pieza

Descripción

LM317

3-TERMINAL ADJUSTABLE REGULATOR ( 10 Page)

4 page

LM317

3-TERMINAL ADJUSTABLE REGULATOR

SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

240

Ω

IAdj

Cin (Note A)

0.1

µF

CO (Note B)

1.0

µF

NOTES: A. Cin is not required if the regulator is close enough to the power-supply filter.

B. CO improves transient response, but is not needed for stability.

Since IAdj is typically 50 µA, it is negligible in most applications.

Vref = 1.25 V

out + Vref 1 )

) (I

Adj

R2)

Vout is calculated as:

INPUT

OUTPUT

ADJUST

LM317

Figure 1. Adjustable Voltage Regulator

0.1

µF

120

Ω

3 k

Ω

INPUT

OUTPUT

ADJUST

LM317

+35 V

680

Ω

–10 V

Since IAdj is typically 50 µA, it is negligible in most applications.

out + Vref 1 )

) R3

) I

Adj(R2 ) R3) – 10 V

Vout is calculated as:

Figure 2. 0-V to 30-V Regulator Circuit

1 2 3 4 5 6 7 8 9 10

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