Texas Instruments LM317DCY Schematic [ru]

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OUTPUT

INPUT

KCS (TO-220) P ACKAGE

(TOP VIEW)

ADJUST

OUTPUT

INPUT

KC (TO-220) P ACKAGE

(TOP VIEW)

ADJUST

OUTPUT

DCY (SOT-223) PACKAGE

(TOP VIEW)

INPUT

OUTPUT

ADJUST

OUTPUT

KTE PACKAGE

(TOP VIEW)

INPUT OUTPUT ADJUST

OUTPUT

3-TERMINAL ADJUSTABLE REGULATOR

SLVS044Q – SEPTEMBER 1997 – REVISED OCTOBER 2005

FEATURES

• Output Voltage Range Adjustable From 1.25 V • Thermal Overload Protection

to 37 V

• Output Current Greater Than 1.5 A

• Internal Short-Circuit Current Limiting

• Output Safe-Area Compensation

LM317

DESCRIPTION/ORDERING INFORMATION

The LM317 is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to 37 V. It is exceptionally easy to use and requires only two external resistors to set the output voltage. Furthermore, both line and load regulation are better than standard fixed regulators.

In addition to having higher performance than fixed regulators, this device includes on-chip current limiting, thermal overload protection, and safe operating-area protection. All overload protection remains fully functional, even if the ADJUST terminal is disconnected.

The LM317 is versatile in its applications, including uses in programmable output regulation and local on-card regulation. Or, by connecting a fixed resistor between the ADJUST and OUTPUT terminals, the LM317 can function as a precision current regulator. An optional output capacitor can be added to improve transient response. The ADJUST terminal can be bypassed to achieve very high ripple-rejection ratios, which are difficult to achieve with standard three-terminal regulators.

0 ° C to 125 ° C Reel of 2500 LM317DCYR

(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

PowerFLEX, PowerPAD are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

ORDERING INFORMATION

PowerFLEX™ – KTE Reel of 2000 LM317KTER LM317

SOT-223 – DCY L3

www.ti.com/sc/package.

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.

TO-220 – KC Tube of 50 LM317KC TO-220, short shoulder – KCS Tube of 20 LM317KCS

PACKAGE

(1)

Tube of 80 LM317DCY

ORDERABLE PART NUMBER TOP-SIDE MARKING

LM317

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ADJUST

OUTPUT

INPUT

LM317 3-TERMINAL ADJUSTABLE REGULATOR

SLVS044Q – SEPTEMBER 1997 – REVISED OCTOBER 2005

SCHEMATIC DIAGRAM

Absolute Maximum Ratings

(1)

over virtual junction temperature range (unless otherwise noted)

MIN MAX UNIT

VI– V T

stg

(1) 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.

Package Thermal Data

PowerFLEX™ (KTE) High K, JESD 51-5 23 ° C/W 3 ° C/W

TO-220 (KC/KCS) High K, JESD 51-5 19 ° C/W 17 ° C/W 3 ° C/W

(1) Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient

temperature is PD= (TJ(max) – TA)/ θJA. Operating at the absolute maximum TJof 150 ° C can affect reliability.

(2) For packages with exposed thermal pads, such as QFN, PowerPAD™, or PowerFLEX™, θJPis defined as the thermal resistance

between the die junction and the bottom of the exposed pad.

Input-to-output differential voltage 40 V

Operating virtual junction temperature 150 ° C Lead temperature 1,6 mm (1/16 in) from case for 10 s 260 ° C Storage temperature range –65 150 ° C

(1)

PACKAGE BOARD θ

SOT-223 (DCY) High K, JESD 51-7 53 ° C/W 30.6 ° C/W

(2)

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3-TERMINAL ADJUSTABLE REGULATOR

SLVS044Q – SEPTEMBER 1997 – REVISED OCTOBER 2005

Recommended Operating Conditions

MIN MAX UNIT

VI– V I

Electrical Characteristics

over recommended ranges of operating virtual junction temperature (unless otherwise noted)

Line regulation

Load regulation IO= 10 mA to 1500 mA

Thermal regulation 20-ms pulse, TJ= 25 ° C 0.03 0.07 %V ADJUST terminal current 50 100 µ A Change in

ADJUST terminal current Reference voltage VI– VO= 3 V to 40 V, PD≤ 20 W, IO= 10 mA to 1500 mA 1.2 1.25 1.3 V Output-voltage

temperature stability Minimum load current

to maintain regulation

Maximum output current A

RMS output noise voltage (% of VO)

Ripple rejection VO= 10 V, f = 120 Hz dB

Long-term stability TJ= 25 ° C 0.3 1 %/1k hr

Input-to-output differential voltage 3 40 V

Output current 1.5 A Operating virtual junction temperature 0 125 ° C

PARAMETER TEST CONDITIONS

(2)

VI– VO= 3 V to 40 V %/V

= 10 µ F,

ADJ

TJ= 25 ° C

TJ= 0 ° C to 125 ° C

(1)

MIN TYP MAX UNIT

TJ= 25 ° C 0.01 0.04 TJ= 0 ° C to 125 ° C 0.02 0.07

(3)

VO≤ 5 V 25 mV VO≥ 5 V 0.1 0.5 %V VO≤ 5 V 20 70 mV VO≥ 5 V 0.3 1.5 %V

VI– VO= 2.5 V to 40 V, PD≤ 20 W, IO= 10 mA to 1500 mA 0.2 5 µ A

TJ= 0 ° C to 125 ° C 0.7 %V

VI– VO= 40 V 3.5 10 mA VI– VO≤ 15 V, PD< P

VI– VO≤ 40 V, PD< P

(4)

MAX

(4)

, TJ= 25 ° C 0.15 0.4

MAX

1.5 2.2

f = 10 Hz to 10 kHz, TJ= 25 ° C 0.003 %V

= 0 µ F = 10 µ F

(3)

62 64

ADJ

LM317

(1) Unless otherwise noted, the following test conditions apply: |VI– VO| = 5 V and I

techniques are used to maintain the junction temperature as close to the ambient temperature as possible.

= 1.5 A, TJ= 0 ° C to 125 ° C. Pulse testing

OMAX

(2) Line regulation is expressed here as the percentage change in output voltage per 1-V change at the input. (3) C (4) Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient

is connected between the ADJUST terminal and GND.

ADJ

temperature is PD= (TJ(max) – TA)/ θJA. Operating at the absolute maximum TJof 150 ° C can affect reliability.

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9.98

9.985

9.99

9.995

10.005

10.01

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.911.1

1.2

1.3

1.4

1.5

OUT

– A

OUT

– V

T = 25°C

T = –40°C

T = 125°C

V = 10 V Nom

OUT

-0.4

-0.2

0.2

0.4

0.6

0.8

1.2

1.4

0.2

0.4

0.6

0.811.2

1.4

1.6

1.822.2

2.4

2.6

2.833.2

3.4

OUT

– A

OUT

– V

T = 125°C

T = 25°C

T = –40°C

V = V

OUT REF

-5

-4.5

-4

-3.5

-3

-2.5

-2

-1.5

-1

-0.5

-30

-20

-10

Tim e – µs

Load Current – A

9.2

9.4

9.6

9.8

10.2

10.4

10.6

10.8

OUT

C = 10 µF

ADJ

-5

-4.5

-4

-3.5

-3

-2.5

-2

-1.5

-1

-0.5

-30

-20

-10

Tim e – µs

Load Current – A

9.2

9.4

9.6

9.8

10.2

10.4

10.6

10.8

OUT

Deviation – V

OUT

C = 0 µF

ADJ

LM317 3-TERMINAL ADJUSTABLE REGULATOR

SLVS044Q – SEPTEMBER 1997 – REVISED OCTOBER 2005

LOAD REGULATION LOAD REGULATION

TYPICAL CHARACTERISTICS

LOAD TRANSIENT RESPONSE LOAD TRANSIENT RESPONSE

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1.24

1.245

1.25

1.255

1.26

1.265

1.27

1.275

1.28

1.285

VIN– V

OUT

– V

T = 125°C

T = 25°C

T = –40°C

-25

-15

-5

Tim e – µs

Change – V

9.98

10.00

10.02

10.04

10.06

10.08

10.10

OUT

– V

OUT

C = 0 µF

ADJ

-25

-15

-5

Tim e – µs

Change – V

9.98

10.00

10.02

10.04

10.06

10.08

10.10

10.12

OUT

– V

OUT

C = 10 µF

ADJ

-90

-80

-70

-60

-50

-40

-30

-20

-10

100 1000 10000 100000 1000000

Frequency – Hz

Ripple Rejection – dB

VIN= 15 V

OUT

= 10 V

OUT

= 500 mA

TA= 25°C

100

10k 100k

C = 0 µF

ADJ

C = 10 µF

ADJ

TYPICAL CHARACTERISTICS (continued)

LM317

3-TERMINAL ADJUSTABLE REGULATOR

SLVS044Q – SEPTEMBER 1997 – REVISED OCTOBER 2005

LINE REGULATION LINE TRANSIENT RESPONSE

LINE TRANSIENT RESPONSE RIPPLE REJECTION

FREQUENCY

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-68

-66

-64

-62

-60

-58

-56

-54

-52

-50

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.911.1

1.2

1.3

1.4

1.5

OUT

– A

Ripple Rejection – dB

VIN= 15 V

OUT

= 10 V

f = 120 Hz

TA= 25°C

-75

-70

-65

-60

-55

-50

-45

-40

-35

5 10 15 20 25 30 35

OUT

– V

Ripple Rejection – dB

VIN– V

OUT

= 15 V

OUT

= 500 mA

f = 120 Hz

TA= 25°C

LM317 3-TERMINAL ADJUSTABLE REGULATOR

SLVS044Q – SEPTEMBER 1997 – REVISED OCTOBER 2005

TYPICAL CHARACTERISTICS (continued)

RIPPLE REJECTION RIPPLE REJECTION

vs vs

OUTPUT CURRENT OUTPUT VOLTAGE

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LM317

240 Ω

Adj

Adjust

(Note A)

0.1 µF

(Note B)

1.0 µF

(Note C)

NOTES: A. Ci is not required, but is recommended, particularly if the regulator is not in close proximity to the power-supply filter

capacitors. A 0.1-µF disc or 1-µF tantalum provides sufficient bypassing for most applications, especially when adjustment

and output capacitors are used. B. CO improves transient response, but is not needed for stability. C. VO is calculated as shown:

Because I

Adj

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

D. C

ADJ

is used to improve ripple rejection; it prevents amplification of the ripple as the output voltage is adjusted higher. If

ADJ

is used, it is best to include protection diodes.

E. If the input is shorted to ground during a fault condition, protection diodes provide measures to prevent the possibility of

external capacitors discharging through low-impedance paths in the IC. By providing low-impedance discharge paths for

and C

ADJ

, respectively, D1 and D2 prevent the capacitors from discharging into the output of the regulator.

OutputInput

ref

= 1.25 V

VO V

ref



1 



 (I

Adj

 R2)

D1 (Note E) 1N4002

D2 (Note E) 1N4002

ADJ

(Note D)

LM317

3-TERMINAL ADJUSTABLE REGULATOR

SLVS044Q – SEPTEMBER 1997 – REVISED OCTOBER 2005

APPLICATION INFORMATION

Figure 1. Adjustable Voltage Regulator

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