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LM317, NCV317 1.5 A Adjustable Output, Positive Voltage Regulator −terminal

The LM317 is an adjustable 3

positive voltage regulator

capable of supplying in excess of 1.5 A over an output voltage range of 1.2 V to 37 V. This voltage regulator is exceptionally easy to use and

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requires only two external resistors to set the output voltage. Further, it employs internal current limiting, thermal shutdown and safe area compensation, making it essentially blow

−out proof.

The LM317 serves a wide variety of applications including local, on card regulation. This device can also be used to make a programmable output

regulator,

or

by

connecting

a

fixed

resistor

between

the

2

−3

D PAK

D2T SUFFIX

adjustment and output, the LM317 can be used as a precision current regulator.

CASE 936

2

1

3

Features

      

Heatsink surface (shown as terminal 4 in

Output Current in Excess of 1.5 A

case outline drawing) is connected to Pin 2.

Output Adjustable between 1.2 V and 37 V Internal Thermal Overload Protection Internal Short Circuit Current Limiting Constant with Temperature Output Transistor Safe

−Area Compensation −220

TO

Floating Operation for High Voltage Applications 2

Available in Surface Mount D PAK

T SUFFIX

−3, and Standard 3−Lead

CASE 221AB

Transistor Package



1

NCV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC

Pin 1. Adjust 2. Vout 3. Vin

2

−Q100

3

Qualified and PPAP Capable

 

Eliminates Stocking many Fixed Voltages

Heatsink surface connected to Pin 2.

−Free Devices

These are Pb

Vin

Vout

LM317

ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 10 of this data sheet.

R1 240

IAdj

Adjust

Cin* 0.1 mF

+ C ** O 1.0 mF

DEVICE MARKING INFORMATION See

general

marking

information

in

the

device

marking

section on page 10 of this data sheet.

R2

**Cin is required if regulator is located an appreciable distance from power supply filter. **CO is not needed for stability, however, it does improve transient response.

ǒ

Ǔ

R V out  + 1.25V 1 ) 2  ) I AdjR 2 R 1 Since IAdj is controlled to less than 100 mA, the error associated with this term is negligible in most applications. Figure 1. Standard Application



Semiconductor Components Industries, LLC, 2013

April, 2013

− Rev. 13

1

Publication Order Number: LM317/D

LM317, NCV317

MAXIMUM RATINGS Rating Input

Symbol

−Output Voltage Differential

−VO

VI

Value

Unit

−0.3 to 40

Vdc

Power Dissipation Case 221A



TA = +25 C

−to−Ambient Thermal Resistance, Junction−to−Case 2 Case 936 (D PAK−3) TA = +25C Thermal Resistance, Junction−to−Ambient Thermal Resistance, Junction−to−Case Thermal Resistance, Junction

Operating Junction Temperature Range Storage Temperature Range

PD

Internally Limited

W

qJA qJC

65 5.0

C/W C/W

PD

Internally Limited

W

qJA qJC

70 5.0

C/W C/W

TJ

− 55 to +150

C

Tstg

− 65 to +150

C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.

ELECTRICAL CHARACTERISTICS

−VO = 5.0 V; IO = 0.5 A for D2T and T packages; TJ = Tlow to Thigh (Note 1); Imax and Pmax (Note 2); unless otherwise noted.)

(VI

Characteristics



Line Regulation (Note 3), TA = +25 C, 3.0 V



Figure

 VI−VO  40 V

Load Regulation (Note 3), TA = +25 C, 10 mA VO VO

1

 IO  Imax

2

Symbol

Min

Typ

Max

Unit

Regline

−

0.01

0.04

%/V

Regload

 5.0 V  5.0 V

− − 

−

Thermal Regulation, TA = +25 C (Note 4), 20 ms Pulse Adjustment Pin Current Adjustment Pin Current Change, 2.5 V 10 mA

 VI−VO  40 V,

Regtherm

3

IAdj

1, 2

DIAdj

− − −

5.0

25

mV

0.1

0.5

% VO

0.03

0.07

50 0.2

 VI−VO  40 V, 10 mA  IO  Imax, PD  Pmax

Line Regulation (Note 3), 3.0 V

3

Vref

1.2

1.25

1.3

V

 VI−VO  40 V

1

Regline

−

0.02

0.07

% V

 IO  Imax

2

Regload

− −

20

70

mV

0.3

1.5

% VO

Load Regulation (Note 3), 10 mA

฀5.0 V VO  5.0 V VO

 TJ  Thigh)

Temperature Stability (Tlow

−VO = 40 V)

Minimum Load Current to Maintain Regulation (VI Maximum Output Current

3

TS

−

0.7

−

% VO

3

ILmin

−

3.5

10

mA

3

−VO  15 V, PD  Pmax, T Package VI−VO = 40 V, PD  Pmax, TA = +25C, T Package 

RMS Noise, % of VO, TA = +25 C, 10 Hz

A

Imax

VI

1.5 0.15

 f  10 kHz

Ripple Rejection, VO = 10 V, f = 120 Hz (Note 5)

−

N

4

RR

−

2.2 0.4 0.003

−

65

mF

66

80

−

−

3

S

Thermal Shutdown (Note 6)

−Term Stability, TJ = Thigh (Note 7), TA = +25C for

− − −

− −

180 0.3

− − − 1.0

Endpoint Measurements



C %/1.0 kHrs.

Thermal Resistance Junction Tlow to Thigh = 0

% VO dB

Without CAdj CAdj = 10

1.

mA mA

 IL  Imax, PD  Pmax

Reference Voltage, 3.0 V

Long

100 5.0

% VO/W

−to−Case, T Package



to +125 C, for LM317T, D2T. Tlow to Thigh =

− 40

− 

RqJC

−

5.0

to +125 C, for LM317BT, BD2T, Tlow to Thigh =

− − 55

C/W 

to +150 C, for

NCV317BT, BD2T. 2.

Imax = 1.5 A, Pmax = 20 W

3.

Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.

4.

Power dissipation within an IC voltage regulator produces a temperature gradient on the die, affecting individual IC components on the die. These effects can be minimized by proper integrated circuit design and layout techniques. Thermal Regulation is the effect of these temperature gradients on the output voltage and is expressed in percentage of output change per watt of power change in a specified time.

5.

CAdj, when used, is connected between the adjustment pin and ground.

6.

Thermal characteristics are not subject to production test.

7.

Since Long

−Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average

stability from lot to lot.

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LM317, NCV317

Vin 310

310

230

5.6 k

120

6.3 V 170 12 k

6.7 k 12.4 k

125 k

160 13 k

5.0 pF

135

6.8 k

510

200 6.3 V

30pF

30pF

2.4 k

105

6.3 V 190

3.6 k 5.8 k 110

5.1 k

4.0

12.5 k 0.1

Vout Adjust This device contains 29 active transistors.

Figure 2. Representative Schematic Diagram

VCC VIH VIL

*

LineRegulation(%ńV) +

|V OH–V OL| |V OL|

VOH

x100

VOL

Vout

Vin LM317 *Pulse testing required. *1% Duty Cycle *is suggested.

Adjust Cin

0.1 mF

IAdj

R1

240 1%

+ CO

1.0 mF

R2 1%

Figure 3. Line Regulation and

DIAdj/Line Test Circuit

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RL

LM317, NCV317

VI

Vin

Vout

IL

LM317

Adjust Cin

0.1 mF

RL (max Load)

240 1%

R1

* + CO

IAdj

*Pulse testing required. *1% Duty Cycle is suggested.

Load Regulation (mV) = VO (min Load) - VO (max Load)

Load Regulation (% VO) =

Figure 4. Load Regulation and

VO (min Load)

x 100

DIAdj/Load Test Circuit

IL

Adjust R1 IAdj Cin

VO (min Load) - VO (max Load)

Vout

LM317

VI

RL (min Load)

1.0 mF

R2 1%

Vin

VO (min Load) VO (max Load)

240 1%

RL

Vref + CO

0.1 mF

1.0 mF

VO

ISET R2 1%

To Calculate R2: Vout = ISET R2 + 1.250 V To Calculate R2: Assume ISET = 5.25 mA

* Pulse testing required. * 1% Duty Cycle is suggested.

Figure 5. Standard Test Circuit

24 V Vout

Vin

14 V f = 120 Hz

LM317

Adjust Cin

R1

240 1%

D1* 1N4002

0.1 mF

CO

R2

RL +

1.0 mF

+

1.65 k 1%

CAdj

10 mF

*D1 Discharges CAdj if output is shorted to Ground. Figure 6. Ripple Rejection Test Circuit

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Vout = 10 V VO

4.0 0.4 I out , OUTPUT CURRENT (A)

Vout, OUTPUT VOLTAGE CHANGE (%)

LM317, NCV317

0.2 IL = 0.5 A

0 -0.2

IL = 1.5 A

-0.4 Vin = 15 V Vout = 10 V

-0.6 -0.8 -1.0

-50

-25 0 25 50 75 100 T J, JUNCTION TEMPERATURE (C)

125

3.0 T J = 25C 2.0 150C

0

150

-55C

1.0

0

10 20 30 40 Vin-Vout , INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc)

Figure 7. Load Regulation

Figure 8. Current Limit

V in -Vout, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc)

I Adj, ADJUSTMENT PIN CURRENT ( A)

3.0 70 65 60 55 50 45 40 35

-50

-25

0

25

50

75

100

125

150

1.0 A

2.0

500 mA 1.5

200 mA 20 mA -50

-25

0

25

50

75

100

T J, JUNCTION TEMPERATURE (C)

T J, JUNCTION TEMPERATURE (C)

Figure 9. Adjustment Pin Current

Figure 10. Dropout Voltage

125

150

5.0 IB, QUIESCENT CURRENT (mA)

V ref, REFERENCE VOLTAGE (V)

IL = 1.5 A

2.5

1.0

1.26

1.25

1.24

1.23

1.22

DVout = 100 mV

-50

-25 0 25 50 75 100 125 T J, JUNCTION TEMPERATURE (C)

4.5

+25C

3.5

+150C

3.0 2.5 2.0 1.5 1.0 0.5 0

150

T J = -55C

4.0

0

Figure 11. Temperature Stability

10 20 30 40 Vin-Vout , INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc) Figure 12. Minimum Operating Current

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LM317, NCV317

100 120 RR, RIPPLE REJECTION (dB)

RR, RIPPLE REJECTION (dB)

CAdj = 10 mF 80 Without CAdj

60 40 Vin - Vout = 5 V IL = 500 mA f = 120 Hz T J = 25C

20 0

0

5.0

10

15

20

25

30

100 CAdj = 10 mF

80

Without CAdj

60 40 20 0 0.01

35

Vin = 15 V Vout = 10 V f = 120 Hz T J = 25C 0.1

Vout , OUTPUT VOLTAGE (V)

Figure 14. Ripple Rejection versus

Voltage

Output Current

101 Z O, OUTPUT IMPEDANCE () 

RR, RIPPLE REJECTION (dB)

80

IL = 500 mA Vin = 15 V Vout = 10 V T J = 25C

60 40 20

CAdj = 10 mF Without CAdj 100

1.0 k 10 k

100 k

10-1

Without CAdj 10-2 CAdj = 10 mF 10-3

1.0 M 10 M

Vin = 15 V Vout = 10 V IL = 500 mA T J = 25C

100

10

100

1.0 k

f, FREQUENCY (Hz)

V in , INPUT VOTLAGE CHANGE (V)

V out , OUTPUT VOLTAGE DEVIATION (V)

0 Vout = 10 V IL = 50 mA T J = 25C

-1.0 -1.5 1.0

Vin

0.5 0

10

20

1.0 M

3.0 2.0 1.0 0

CL = 1.0 mF; CAdj = 10 mF

-1.0 -2.0

30

40

Vin = 15 V Vout = 10 V INL = 50 mA T J = 25C

CL = 0; Without CAdj

-3.0 CL = 0; Without CAdj

IL , LOAD CURRENT (A)

Vout , OUTPUT VOLTAGE DEVIATION (V)

CL = 1.0 mF; CAdj = 10 mF

-0.5

100 k

Figure 16. Output Impedance

1.5 1.0 0.5

10 k

f, FREQUENCY (Hz)

Figure 15. Ripple Rejection versus Frequency

0

10

Figure 13. Ripple Rejection versus Output

100

0 10

1.0

IO, OUTPUT CURRENT (A)

1.5 1.0

IL

0.5 0 0

t, TIME (ms)

10

20

30

t, TIME (ms)

Figure 17. Line Transient Response

Figure 18. Load Transient Response

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40

LM317, NCV317

APPLICATIONS INFORMATION External Capacitors

Basic Circuit Operation The

LM317

is

a

−terminal

3

floating

regulator.

A 0.1

In

mF disc or 1.0 mF tantalum input bypass capacitor

operation, the LM317 develops and maintains a nominal

(Cin) is recommended to reduce the sensitivity to input line

1.25 V reference (Vref) between its output and adjustment

impedance.

a

The adjustment terminal may be bypassed to ground to

programming current (IPROG) by R1 (see Figure 17), and this

improve ripple rejection. This capacitor (CAdj) prevents

constant current flows through R2 to ground.

ripple

terminals.

This

reference

voltage

is

converted

to

ǒ

Ǔ

do

this,

returned

to

the

all

quiescent

output

terminal.

mA

This

amplified

mF

as

the

capacitor

output

should

current

imposes

feedback can

circuit,

cause

certain

excessive

capacitance (CO) in the form of a 1.0

voltage

improve

is

ripple

values

of

ringing.

external

An

output

mF tantalum or 25 mF

aluminum electrolytic capacitor on the output swamps this

and keep it

operating

any

capacitance

represents an error term in the equation, the LM317 was

To

10

Although the LM317 is stable with no output capacitance, like

Since the current from the adjustment terminal (IAdj)

constant.

being

A

rejection about 15 dB at 120 Hz in a 10 V application.

R V out  + V  1 ) 2  ) I R Adj 2 ref R1

designed to control IAdj to less than 100

from

increased.

The regulated output voltage is given by:

effect and insures stability.

is

the

Protection Diodes

requirement for a minimum load current. If the load current

When external capacitors are used with any IC regulator

is less than this minimum, the output voltage will rise.

it is sometimes necessary to add protection diodes to prevent

Since the LM317 is a floating regulator, it is only the

the capacitors from discharging through low current points

voltage differential across the circuit which is important to

into the regulator.

performance, and operation at high voltages with respect to

Figure

ground is possible.

18

shows

the

LM317

with

the

recommended

protection diodes for output voltages in excess of 25 V or

Vin

high capacitance values (CO > 25

Vout

L...