TL317.pdf

TL317

3-TERMINAL ADJUSTABLE REGULATOR

SLVS004D – APRIL 1979 – REVISED JANUARY 2002

Output Voltage Range Adjustable From

1.2 V to 32 V When Used With an External

Resistor Divider

D OR PW PACKAGE

(TOP VIEW)

INPUT

OUTPUT

ADJUSTMENT

OUTPUT

Output Current Capability of 100 mA

Input Regulation Typically 0.01% Per

Input-Voltage Change

Output Regulation Typically 0.5%

Ripple Rejection Typically 80 dB

NC – No internal connection

OUTPUT terminals are all internally connected.

description

LP PACKAGE

(TOP VIEW)

The TL317 is an adjustable three-terminal

positive-voltage regulator capable of supplying

100 mA over an output-voltage range of 1.2 V to

32 V. It is exceptionally easy to use and requires

only two external resistors to set the output

voltage.

INPUT

OUTPUT

ADJUSTMENT

In addition to higher performance than fixed

regulators, this regulator offers full overload

protection available only in integrated circuits. Included on the chip are current-limiting and thermal-overload

protection. All overload-protection circuitry remains fully functional, even when ADJUSTMENT is disconnected.

Normally, no capacitors are needed unless the device is situated far from the input filter capacitors, in which

case an input bypass is needed. An optional output capacitor can be added to improve transient response.

ADJUSTMENT can be bypassed to achieve very high ripple rejection, which is difficult to achieve with standard

three-terminal regulators.

In addition to replacing fixed regulators, the TL317 regulator is useful in a wide variety of other applications.

Since the regulator is floating and sees only the input-to-output differential voltage, supplies of several hundred

volts can be regulated as long as the maximum input-to-output differential is not exceeded. Its primary

application is that of a programmable output regulator, but by connecting a fixed resistor between

ADJUSTMENT and OUTPUT, this device can be used as a precision current regulator. Supplies with electronic

shutdown can be achieved by clamping ADJUSTMENT to ground, programming the output to 1.2 V, where most

loads draw little current.

The TL317C is characterized for operation over the virtual junction temperature range of 0

C to 125

AVAILABLE OPTIONS

PACKAGED DEVICES

T J

SMALL

OUTLINE

(D)

PLASTIC

(LP)

PLASTIC

THIN SHRINK

SMALL OUTLINE

(PW)

C TL317CD TL317CLP TL317CPW

The D and LP packages are available taped and reeled. Add the suffix

R to device type (e.g., TL317CDR). The PW package is only available

taped and reeled.

C to 125

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

2002, Texas Instruments Incorporated

POST OFFICE BOX 655303

DALLAS, TEXAS 75265

TL317

3-TERMINAL ADJUSTABLE REGULATOR

SLVS004D – APRIL 1979 – REVISED JANUARY 2002

schematic

INPUT

310 Ω

310

190 Ω

251

5.6 k

2.1 k

360

200 k

124

11.5 k

1.4

2.12 k

195

5.3 k

5.7 k

5.1 k

10.8 k

670 Ω

OUTPUT

ADJUSTMENT

NOTE A: All component values shown are nominal.

absolute maximum ratings over operating temperature range (unless otherwise noted) †

Input-to-output differential voltage, V l – V O

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

35 V

Package thermal impedance,

JA (see Notes 1 and 2): D package

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

C/W

LP package

. . . . . . . . . . . . . . . . . . . . . . . . . .

156

C/W

PW package

. . . . . . . . . . . . . . . . . . . . . . . . .

149

C/W

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

260

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. Maximum power dissipation is a function of T J (max),

Storage temperature range, T stg

–65

C to 150

ambient temperature is P D = (T J (max) – T A )/

JA . Operating at the absolute maximum T J of 150 °

JA , and T A . The maximum allowable power dissipation at any allowable

C can affect reliability.

2. The package thermal impedance is calculated in accordance with JESD 51-7.

recommended operating conditions

MIN MAX UNIT

V I – V O

Input-to-output voltage differential

I O

Output current

2.5

100

T J

Operating virtual-junction temperature

TL317C

125

POST OFFICE BOX 655303

DALLAS, TEXAS 75265

TL317

3-TERMINAL ADJUSTABLE REGULATOR

SLVS004D – APRIL 1979 – REVISED JANUARY 2002

electrical characteristics over recommended operating virtual-junction temperature range (unless

otherwise noted)

TL317C

PARAMETER

TEST CONDITIONS †

UNIT

PARAMETER

UNIT

MIN

TYP MAX

Input voltage regulation (see Note 3)

V I – V O = 5 V to 35 V

T J = 25 °

0.01

0.02

V I V O =5Vto35V

I O = 2.5 mA to 100 mA

0.02

0.05

V O = 10 V,

f = 120 Hz

Ripple regulation

V O = 10 V,

10- µ

F capacitor between ADJUSTMENT and ground

V I = 5 V to 35 V,

I O 2 5 mA to 100 mA

V O ≤

5 V

I O = 2.5 mA to 100 mA,

T J = 25 °

Output voltage regulation

V O

5 V

mV/V

V I = 5 V to 35 V,

V O ≤

5 V

I ,

I O = 2.5 mA to 100 mA

V O ≥

5 V

mV/V

Output voltage change with temperature

T J = 0 °

C to 125 °

mV/V

Output voltage long-term drift

After 1000 hours at T J = 125 °

C and V I – V O = 35 V

10 mV/V

Output noise voltage

f = 10 Hz to 10 kHz,

T J = 25 °

V/V

Minimum output current to maintain regulation

V I – V O = 35 V

1.5

2.5

Peak output current

V I – V O ≤

35 V

100

200

ADJUSTMENT current

100

Change in ADJUSTMENT current

V I – V O = 2.5 V to 35 V,

I O = 2.5 mA to 100 mA

0.2

µ A

Reference voltage (output to ADJUSTMENT)

V I – V O = 5 V to 35 V,

I O = 2.5 mA to 100 mA,

1.2

1.25

1.3

† Unless otherwise noted, these specifications apply for the following test conditions: V I – V O = 5 V and I O = 40 mA. Pulse-testing techniques must

be used that maintain the junction temperature as close to the ambient temperature as possible. All characteristics are measured with a 0.1- µ

capacitor across the input and a 1- µ F capacitor across the output.

NOTE 3: Input voltage regulation is expressed here as the percentage change in output voltage per 1-V change at the input.

POST OFFICE BOX 655303

DALLAS, TEXAS 75265

TEST CONDITIONS †

Input voltage regulation (see Note 3)

Out ut voltage regulation

rated dissipation

TL317

3-TERMINAL ADJUSTABLE REGULATOR

SLVS004D – APRIL 1979 – REVISED JANUARY 2002

APPLICATION INFORMATION

TL317

V I

Input

Output

V O

(see Note B)

TL317

V O

(see Note A)

Adjustment

35 V

Input

Output

470 Ω

Adjustment

(see Note A)

C1 = 0.1

(see Note C)

R1 = 120

C1 = 0.1 µ

–10 V

R3 =

820 Ω

R2 = 3 k

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:

1N4002

V O V ref 1 R R1

NOTE A: Output voltage is calculated from the equation:

where: V ref equals the difference between OUTPUT and

ADJUSTMENT voltages (

V O V ref 1 R2 R3

R1 10 V

1.25 V).

C. Use of an output capacitor improves transient response

but is optional.

where: V ref equals the difference between OUTPUT

and ADJUSTMENT voltages ( ≈

1.25 V).

Figure 1. Adjustable Voltage Regulator

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

TL317

V I

Input

Output

V O

(see Note A)

D1 †

1N4002

Adjustment

R1 =

470 Ω

C1 =

0.1 µ

R2 =

10 k Ω

–

C3 = 1 µ

C2 = 10

–

TL317

† D1 discharges C2 if output is shorted to ground.

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

optional.

V I

Input

Output

I limit 1.25

Adjustment

Figure 3. Regulator Circuit

With Improved Ripple Rejection

Figure 4. Precision Current-Limiter Circuit

POST OFFICE BOX 655303

DALLAS, TEXAS 75265

C2 = 1

TL317

3-TERMINAL ADJUSTABLE REGULATOR

SLVS004D – APRIL 1979 – REVISED JANUARY 2002

APPLICATION INFORMATION

R2 = 1.5 k Ω

TL317

R1 = 470 Ω

V I

Input

Output

V O = 15 V

Adjustment

R1 =

470

V I

Input

Output

TL317

1N4002

TL317

Input

Output

V O

R3 = 50 k

C1 = 0.1

Adjustment

R3 =

240

C2 = 1

R2 = 5.1 k Ω

Output

Adjust

R4 =

2 k

2N2905

C1 = 25

Figure 5. Tracking Preregulator Circuit

Figure 6. Slow Turnon 15-V Regulator Circuit

TL317

V I

Input

Output

Adjustment

240

TL317

24 Ω

1.1 k Ω

I CHG

V I

Input

Output

Adjustment

V BE

I CHG

Figure 7. 50-mA Constant-Current

Battery-Charger Circuit

V–

Figure 8. Current-Limited 6-V Charger

POST OFFICE BOX 655303

DALLAS, TEXAS 75265

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