TL317 datasheet(4/7 Pages) TI | 3-TERMINAL ADJUSTABLE REGULATORS

4 page

TL317

3-TERMINAL ADJUSTABLE REGULATORS

SLVS004C – APRIL 1979 – REVISED JULY 1999

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

Figure 1. Adjustable Voltage Regulator

C1 = 0.1

µF

(see Note A)

470

Ω

C2 = 1

µF

(see Note C)

(see Note B)

Adjustment

Output

Input

TL317

NOTES: A. Use of an input bypass capacitor is recommended if

regulator is far from the filter capacitors.

B. Output voltage is calculated from the equation:

where: Vref equals the difference between OUTPUT and

ADJUSTMENT voltages (

≈1.25 V).

C. Use of an output capacitor improves transient response

but is optional.

O + Vref 1 )

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

(see Note A)

R2 = 3 k

Ω

1N4002

R3 =

820

Ω

–10 V

C1 = 0.1

µF

35 V

Adjustment

Output

Input

TL317

NOTE A: Output voltage is calculated from the equation:

where: Vref equals the difference between OUTPUT

and ADJUSTMENT voltages (

≈1.25 V).

R1 = 120

Ω

O + Vref 1 )

) R3

* 10 V

Figure 3. Regulator Circuit

With Improved Ripple Rejection

R1 =

470

Ω

D1†

1N4002

C3 = 1

µF

C2 = 10

µF

R2 =

10 k

Ω

–

Adjustment

Output

Input

TL317

† D1 discharges C2 if output is shorted to ground.

NOTE A: Use of an output capacitor improves transient response but is

optional.

(see Note A)

C1 =

0.1

µF

Figure 4. Precision Current-Limiter Circuit

Adjustment

Output

Input

TL317

limit +

1.25

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