TL317 Datasheet, PDF (4/7 Pages) Texas Instruments – 3-TERMINAL ADJUSTABLE REGULATORS

TL317
3-TERMINAL ADJUSTABLE REGULATORS
SLVS004C – APRIL 1979 – REVISED JULY 1999
APPLICATION INFORMATION
VI
C1 = 0.1 µF
(see Note A)
TL317
Input Output
Adjustment
R1
470 Ω
R2
VO
(see Note B)
C2 = 1 µF
(see Note C)
35 V
C1 = 0.1 µF
TL317
Input Output
Adjustment
–10 V
R3 =
820 Ω
VO
(see Note A)
R1 = 120 Ω
R2 = 3 kΩ
NOTES: A. Use of an input bypass capacitor is recommended if
+ ǒ ) Ǔ ^{regulator is far from the filter capacitors.}
B. Output voltage is calculated from the equation:
V_O
V_ref 1
R2
R1
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.
Figure 1. Adjustable Voltage Regulator
1N4002
+ ǒ ) ⁾ Ǔ * ^{NOTE A: Output voltage is calculated from the equation:}
V_O
V_ref 1
R2 R3
R1
10 V
where: Vref equals the difference between OUTPUT
and ADJUSTMENT voltages (≈1.25 V).
Figure 2. 0-V to 30-V Regulator Circuit
VI
C1 =
0.1 µF
TL317
Input Output
Adjustment
R1 =
470 Ω
D1†
1N4002
VO
(see Note A)
R2 =
10 kΩ
+
– ^{C2 = 10 µF}
+
C3 = 1 µF
–
† _{D1 discharges C2 if output is shorted to ground.}
NOTE A: Use of an output capacitor improves transient response but is
optional.
Figure 3. Regulator Circuit
With Improved Ripple Rejection
TL317
VI
Input Output
Adjustment
R1
+ I_limit
1.25
R1
Figure 4. Precision Current-Limiter Circuit
4
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