lm317 데이터시트, PDF 다운로드

lm317 LM117, LM317A, LM317-N

www.ti.com SNVS774O –MAY 2004–REVISED JANUARY 2014

LM117/LM317A/LM317-N Three-Terminal Adjustable Regulator

Check for Samples: LM117, LM317A, LM317-N

1FEATURES Normally, no capacitors are needed unless the device

is situated more than 6 inches from the input filter

2• Specified 1% Output Voltage Tolerance capacitors in which case an input bypass is needed. (LM317A) An optional output capacitor can be added to improve

• Specified max. 0.01%/V Line Regulation transient response. The adjustment terminal can be

(LM317A) bypassed to achieve very high ripple rejection ratios

which are difficult to achieve with standard 3-terminal • Specified max. 0.3% Load Regulation (LM117) regulators.

• Specified 1.5A Output Current

Besides replacing fixed regulators, the LM117 is • Adjustable Output Down to 1.2V useful in a wide variety of other applications. Since

• Current Limit Constant with Temperature the regulator is “floating” and sees only the input-to-

• P output differential voltage, supplies of several + Product Enhancement tested

hundred volts can be regulated as long as the • 80 dB Ripple Rejection maximum input to output differential is not exceeded,

• Output is Short-Circuit Protected i.e., avoid short-circuiting the output.

DESCRIPTION Also, it makes an especially simple adjustable

switching regulator, a programmable output regulator, The LM117 series of adjustable 3-terminal positive or by connecting a fixed resistor between the voltage regulators is capable of supplying in excess adjustment pin and output, the LM117 can be used of 1.5A over a 1.2V to 37V output range. They are as a precision current regulator. Supplies with exceptionally easy to use and require only two electronic shutdown can be achieved by clamping the external resistors to set the output voltage. Further, adjustment terminal to ground which programs the both line and load regulation are better than standard output to 1.2V where most loads draw little current. fixed regulators. Also, the LM117 is packaged in

standard transistor packages which are easily For applications requiring greater output current, see

mounted and handled. LM150 series (3A) and LM138 series (5A) data

sheets. For the negative complement, see LM137 In addition to higher performance than fixed series data sheet. regulators, the LM117 series offers full overload

protection available only in IC's. Included on the chip

are current limit, thermal overload protection and safe

area protection. All overload protection circuitry

remains fully functional even if the adjustment

terminal is disconnected.

1

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.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date. Copyright © 2004–2014, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.LM117, LM317A, LM317-N

SNVS774O –MAY 2004–REVISED JANUARY 2014 www.ti.com

Typical Applications

Full output current not available at high input-output voltages

*Needed if device is more than 6 inches from filter capacitors.

†Optional—improves transient response. Output capacitors in the range of 1 μF to 1000 μF of aluminum or tantalum

electrolytic are commonly used to provide improved output impedance and rejection of transients.

Figure 1. 1.2V–25V Adjustable Regulator

LM117/LM317A/LM317-N Package Options

Part Number Package Drawing Package Type Output Current

LM117K STEEL

NDS TO-3

LM317K

LM317AT

NDE 1.5A

LM317T TO-220

LM317T/LF01 NDG

LM317S KTT TO-263

LM317AEMP

DCY SOT-223 1.0A

LM317EMP

LM117H

LM317AH NDT TO

LM317H 0.5A

LM317AMDT

NDP TO-252

LM317MDT

NOTE

For part numbers that can be ordered, please see the Package Option Addendum at the

end of the datasheet.

SOT-223 vs. TO-252 Packages

Figure 2. Scale 1:1

2 Submit Documentation Feedback Copyright © 2004–2014, Texas Instruments Incorporated

Product Folder Links: LM117 LM317A LM317-NLM117, LM317A, LM317-N

www.ti.com SNVS774O –MAY 2004–REVISED JANUARY 2014

Connection Diagrams

CASE IS OUTPUT

CASE IS OUTPUT

Figure 3. TO-3 (NDS) Figure 4. TO (NDT)

Metal Can Package Metal Can Package

Bottom View Bottom View

Package Drawing NDS Package Drawing NDT

Figure 5. TO-263 (KTT) Figure 6. TO-220 (NDE)

Surface-Mount Package Plastic Package

Top View Front View

Package Drawing KTT Package Drawing NDE

Figure 7. 4-Lead SOT-223 (DCY) Figure 8. TO-252 (NDP)

Top View Surface-Mount Package Front View Surface Mount Package

Package Number DCY Package Drawing NDP

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Copyright © 2004–2014, Texas Instruments Incorporated Submit Documentation Feedback 3

Product Folder Links: LM117 LM317A LM317-NLM117, LM317A, LM317-N

SNVS774O –MAY 2004–REVISED JANUARY 2014 www.ti.com

ABSOLUTE MAXIMUM RATINGS (1)(2)

Power Dissipation Internally Limited

Input-Output Voltage Differential +40V, −0.3V

Storage Temperature −65°C to +150°C

Lead Temperature Metal Package (Soldering, 10 seconds) 300°C

Plastic Package (Soldering, 4 seconds) 260°C

ESD Tolerance (3) 3 kV

(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for

which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and test

conditions, see the Electrical Characteristics. The ensured specifications apply only for the test conditions listed.

(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and

specifications.

(3) Human body model, 100 pF discharged through a 1.5 kΩ resistor.

OPERATING TEMPERATURE RANGE

LM117 −55°C ≤ TJ ≤ +150°C

LM317A −40°C ≤ TJ ≤ +125°C

LM317-N 0°C ≤ TJ ≤ +125°C

Preconditioning

Thermal Limit Burn-In All Devices 100%

4 Submit Documentation Feedback Copyright © 2004–2014, Texas Instruments Incorporated

Product Folder Links: LM117 LM317A LM317-NLM117, LM317A, LM317-N

www.ti.com SNVS774O –MAY 2004–REVISED JANUARY 2014

LM117 ELECTRICAL CHARACTERISTICS(1)

Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating

Temperature Range. Unless otherwise specified, VIN − VOUT = 5V, and IOUT = 10 mA.

LM117 (2)

Parameter Conditions

Min Typ Max Units

3V ≤ (VIN − VOUT) ≤ 40V, Reference Voltage 1.20 1.25 1.30 V

10 mA ≤ IOUT ≤ IMAX

(1)

0.01 0.02 Line Regulation 3V ≤ (VIN − VOUT) ≤ 40V (3) %/V 0.02 0.05

0.1 0.3 Load Regulation 10 mA ≤ IOUT ≤ IMAX

(1) (3) % 0.3 1

Thermal Regulation 20 ms Pulse 0.03 0.07 %/W

Adjustment Pin Current 50 100 μA

10 mA ≤ IOUT ≤ IMAX

(1)

Adjustment Pin Current Change 0.2 5 μA

3V ≤ (VIN − VOUT) ≤ 40V

Temperature Stability TMIN ≤ TJ ≤ TMAX 1 %

Minimum Load Current (VIN − VOUT) = 40V 3.5 5 mA

NDS Package 1.5 2.2 3.4

(VIN − VOUT) ≤ 15V A

NDT Package 0.5 0.8 1.8

Current Limit

NDS Package 0.3 0.4

(VIN − VOUT) = 40V A

NDT Package 0.15 0.20

RMS Output Noise, % of VOUT 10 Hz ≤ f ≤ 10 kHz 0.003 %

VOUT = 10V, f = 120 Hz, CADJ = 0 μF 65 dB

Ripple Rejection Ratio

VOUT = 10V, f = 120 Hz, CADJ = 10 μF 66 80 dB

Long-Term Stability TJ = 125°C, 1000 hrs 0.3 1 %

Thermal Resistance, θ NDS (TO-3) Package 2

JC °C/W Junction-to-Case NDT (TO) Package 21

Thermal Resistance, θJA NDS (TO-3) Package 39

Junction-to-Ambient °C/W

NDT (TO) Package 186 (No Heat Sink)

(1) IMAX = 1.5A for the NDS (TO-3), NDE (TO-220), and KTT (TO-263) packages. IMAX = 1.0A for the DCY (SOT-223) package. IMAX = 0.5A

for the NDT (TO) and NDP (TO-252) packages. Device power dissipation (PD) is limited by ambient temperature (TA), device maximum

junction temperature (TJ

), and package thermal resistance (θJA). The maximum allowable power dissipation at any temperature is :

PD(MAX) = ((TJ(MAX) - TA)/θJA). All Min. and Max. limits are ensured to TI's Average Outgoing Quality Level (AOQL).

(2) Specifications and availability for military and space grades of LM117/883 can be found in the LM117QML datasheet (SNVS356).

Specifications and availability for military and space grades of LM117/JAN can be found in the LM117JAN datasheet (SNVS365).

(3) Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to

heating effects are covered under the specifications for thermal regulation.

Copyright © 2004–2014, Texas Instruments Incorporated Submit Documentation Feedback 5

Product Folder Links: LM117 LM317A LM317-NLM117, LM317A, LM317-N

SNVS774O –MAY 2004–REVISED JANUARY 2014 www.ti.com

LM317A and LM317-N ELECTRICAL CHARACTERISTICS(1)

Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating

Temperature Range. Unless otherwise specified, VIN − VOUT = 5V, and IOUT = 10 mA.

LM317A LM317-N

Parameter Conditions Unit Min Typ Max Min Typ Max

s

1.238 1.250 1.262 - 1.25 - V

Reference Voltage 3V ≤ (VIN − VOUT) ≤ 40V, 1.225 1.250 1.270 1.20 1.25 1.30 V

10 mA ≤ IOUT ≤ IMAX

(1)

0.005 0.01 0.01 0.04 Line Regulation 3V ≤ (VIN − VOUT) ≤ 40V (2) %/V 0.01 0.02 0.02 0.07

0.1 0.5 0.1 0.5 Load Regulation 10 mA ≤ IOUT ≤ IMAX

(1) (2) % 0.3 1 0.3 1.5

Thermal Regulation 20 ms Pulse 0.04 0.07 0.04 0.07 %/W

Adjustment Pin Current 50 100 50 100 μA

Adjustment Pin Current 10 mA ≤ IOUT ≤ IMAX

(1)

0.2 5 0.2 5 μA

Change 3V ≤ (VIN − VOUT) ≤ 40V

Temperature Stability TMIN ≤ TJ ≤ TMAX 1 1 %

Minimum Load Current (VIN − VOUT) = 40V 3.5 10 3.5 10 mA

NDS, KTT Packages - - - 1.5 2.2 3.4

(VIN − VOUT) ≤ 15V DCY, NDE Packages 1.5 2.2 3.4 1.5 2.2 3.4 A

NDT Package 0.5 0.8 1.8 0.5 0.8 1.8

Current Limit

NDS, KTT Packages - - 0.15 0.40

(VIN − VOUT) = 40V DCY, NDE Packages 0.15 0.40 0.15 0.40 A

NDT Package 0.075 0.20 0.075 0.20

RMS Output Noise, % of 10 Hz ≤ f ≤ 10 kHz 0.003 0.003 % VOUT

VOUT = 10V, f = 120 Hz, CADJ = 0 μF 65 65 dB

Ripple Rejection Ratio

VOUT = 10V, f = 120 Hz, CADJ = 10 μF 66 80 66 80 dB

Long-Term Stability TJ = 125°C, 1000 hrs 0.3 1 0.3 1 %

NDS (TO-3) Package - 2

NDE (TO-220) Package 4 4

Thermal Resistance, θ KTT (TO-263) Package - 4

JC °C/W Junction-to-Case DCY (SOT-223) Package 23.5 23.5

NDT (TO) Package 21 21

NDP (TO-252) Package 12 12

NDS (TO-3) Package - 39

NDE (TO-220) Package 50 50

Thermal Resistance, θJA KTT (TO-263) Package (3)

- 50 Junction-to-Ambient °C/W

DCY (SOT-223) Package (3) (No Heat Sink) 140 140

NDT (TO) Package 186 186

NDP (TO-252) Package (3) 103 103

(1) IMAX = 1.5A for the NDS (TO-3), NDE (TO-220), and KTT (TO-263) packages. IMAX = 1.0A for the DCY (SOT-223) package. IMAX = 0.5A

for the NDT (TO) and NDP (TO-252) packages. Device power dissipation (PD) is limited by ambient temperature (TA), device maximum

junction temperature (TJ

), and package thermal resistance (θJA). The maximum allowable power dissipation at any temperature is :

PD(MAX) = ((TJ(MAX) - TA)/θJA). All Min. and Max. limits are ensured to TI's Average Outgoing Quality Level (AOQL).

(2) Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to

heating effects are covered under the specifications for thermal regulation.

(3) When surface mount packages are used (TO-263, SOT-223, TO-252), the junction to ambient thermal resistance can be reduced by

increasing the PC board copper area that is thermally connected to the package. See the APPLICATION HINTS section for heatsink

techniques.

6 Submit Documentation Feedback Copyright © 2004–2014, Texas Instruments Incorporated

Product Folder Links: LM117 LM317A LM317-NLM117, LM317A, LM317-N

www.ti.com SNVS774O –MAY 2004–REVISED JANUARY 2014

TYPICAL PERFORMANCE CHARACTERISTICS

Output Capacitor = 0 μF unless otherwise noted

Load Regulation Current Limit

Figure 9. Figure 10.

Adjustment Current Dropout Voltage

Figure 11. Figure 12.

VOUT vs VIN, VOUT = VREF VOUT vs VIN, VOUT = 5V

Figure 13. Figure 14.

Copyright © 2004–2014, Texas Instruments Incorporated Submit Documentation Feedback 7

Product Folder Links: LM117 LM317A LM317-NLM117, LM317A, LM317-N

SNVS774O –MAY 2004–REVISED JANUARY 2014 www.ti.com

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

Output Capacitor = 0 μF unless otherwise noted

Temperature Stability Minimum Operating Current

Figure 15. Figure 16.

Ripple Rejection Ripple Rejection

Figure 17. Figure 18.

Ripple Rejection Output Impedance

Figure 19. Figure 20.

8 Submit Documentation Feedback Copyright © 2004–2014, Texas Instruments Incorporated

Product Folder Links: LM117 LM317A LM317-NLM117, LM317A, LM317-N

www.ti.com SNVS774O –MAY 2004–REVISED JANUARY 2014

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

Output Capacitor = 0 μF unless otherwise noted

Line Transient Response Load Transient Response

Figure 21. Figure 22.

Copyright © 2004–2014, Texas Instruments Incorporated Submit Documentation Feedback 9

Product Folder Links: LM117 LM317A LM317-NLM117, LM317A, LM317-N

SNVS774O –MAY 2004–REVISED JANUARY 2014 www.ti.com

APPLICATION HINTS

In operation, the LM117 develops a nominal 1.25V reference voltage, VREF, between the output and adjustment

terminal. The reference voltage is impressed across program resistor R1 and, since the voltage is constant, a

constant current I1

then flows through the output set resistor R2, giving an output voltage of

(1)

Since the 100 μA current from the adjustment terminal represents an error term, the LM117 was designed to

minimize IADJ and make it very constant with line and load changes. To do this, all quiescent operating current is

returned to the output establishing a minimum load current requirement. If there is insufficient load on the output,

the output will rise.

External Capacitors

An input bypass capacitor is recommended. A 0.1 μF disc or 1μF solid tantalum on the input is suitable input

bypassing for almost all applications. The device is more sensitive to the absence of input bypassing when

adjustment or output capacitors are used but the above values will eliminate the possibility of problems.

The adjustment terminal can be bypassed to ground on the LM117 to improve ripple rejection. This bypass

capacitor prevents ripple from being amplified as the output voltage is increased. With a 10 μF bypass capacitor

80 dB ripple rejection is obtainable at any output level. Increases over 10 μF do not appreciably improve the

ripple rejection at frequencies above 120 Hz. If the bypass capacitor is used, it is sometimes necessary to

include protection diodes to prevent the capacitor from discharging through internal low current paths and

damaging the device.

In general, the best type of capacitors to use is solid tantalum. Solid tantalum capacitors have low impedance

even at high frequencies. Depending upon capacitor construction, it takes about 25 μF in aluminum electrolytic to

equal 1μF solid tantalum at high frequencies. Ceramic capacitors are also good at high frequencies; but some

types have a large decrease in capacitance at frequencies around 0.5 MHz. For this reason, 0.01 μF disc may

seem to work better than a 0.1 μF disc as a bypass.

Although the LM117 is stable with no output capacitors, like any feedback circuit, certain values of external

capacitance can cause excessive ringing. This occurs with values between 500 pF and 5000 pF. A 1 μF solid

tantalum (or 25 μF aluminum electrolytic) on the output swamps this effect and insures stability. Any increase of

the load capacitance larger than 10 μF will merely improve the loop stability and output impedance.

Load Regulation

The LM117 is capable of providing extremely good load regulation but a few precautions are needed to obtain

maximum performance. The current set resistor connected between the adjustment terminal and the output

terminal (usually 240Ω) should be tied directly to the output (case) of the regulator rather than near the load. This

eliminates line drops from appearing effectively in series with the reference and degrading regulation. For

example, a 15V regulator with 0.05Ω resistance between the regulator and load will have a load regulation due to

line resistance of 0.05Ω × IL

. If the set resistor is connected near the load the effective line resistance will be

0.05Ω (1 + R2/R1) or in this case, 11.5 times worse.

Figure 23 shows the effect of resistance between the regulator and 240Ω set resistor.

10 Submit Documentation Feedback Copyright © 2004–2014

 

lm317.pdf