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LM117HV

LM317HV

SNVS773D –APRIL 2000–REVISED SEPTEMBER 2015

LMx17HV High Voltage Three-Terminal Adjustable Regulator With Overload Protection

1 Features 3 Description

The LMx17HV is an adjustable 3-terminal positive

1• Up to 60 V Input to Output Differential voltage regulator capable of supplying 1.5 A or more

• 1.5-A Output Current currents over a 1.25-V to 57-V output voltage range.

• Line Regulation 0.01%/V (Typical) It requires only two external resistors to set the output

voltage. The LMx17HV is packaged in standard

• Load Regulation 0.1% (Typical) transistor packages that are easily mounted and

• 80-dB Ripple Rejection (Typical) handled.

• Internal Short-Circuit Current Limiting Protection The LMx17HV offers overload protection like current

• Thermal Overload Protection limit, thermal overload protection and safe area

• –55 to 150°C Operating Temperature Range protection, which make the device blowout proof. The

(LM117HV) overload protection circuitry remains fully functional

even if the adjustment terminal is disconnected.

• 0 to 125°C Operating Temperature Range

(LM317HV) Typically, no capacitors are needed unless the device

is situated more than 6 inches from the input filter

2 Applications capacitors, in which case an input bypass is needed.

An optional output capacitor can be added to improve

• Industrial Power Supplies transient response. The adjustment terminal can be

• PLC Systems bypassed to achieve very high ripple rejection ratios

• Factory Automation Systems which are difficult to achieve with standard 3-terminal

regulators.

• Building Automation Systems

• Battery Charger Since the regulator is floating and sees only the input-

to-output differential voltage, supplies of several

1.2-V to 50-V Adjustable Regulator With High hundred volts can be regulated as long as the

Voltage Input maximum input to output differential is not exceeded,

or in other words, do not short the output to ground.

By connecting a fixed resistor between the

adjustment and output, the LMx17HV can also be

used as a precision current regulator. Supplies with

electronic shutdown can be achieved by clamping the

adjustment terminal to ground, which programs the

output to 1.25 V where most loads draw little current.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)

TO-39 (3) 8.255 mm × 8.255 mm

LM117HV

LM317HV TO-3 (2) 19.507 mm × 19.507 mm

LM317HV TO-220 (3) 14.986 mm × 10.16 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

*Needed if device is more than 6 inches from filter

capacitors. .

†Optional—improves transient response

††

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM117HV

LM317HV

SNVS773D –APRIL 2000–REVISED SEPTEMBER 2015

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Table of Contents

8.3 Feature Description................................................. 10

1 Features.................................................................. 18.4 Device Functional Modes........................................ 10

2 Applications ........................................................... 19 Application and Implementation ........................ 12

3 Description............................................................. 19.1 Application Information............................................ 12

4 Revision History..................................................... 29.2 Typical Applications ............................................... 12

5 Device Comparison Table..................................... 310 Power Supply Recommendations ..................... 21

6 Pin Configuration and Functions......................... 411 Layout................................................................... 21

7 Specifications......................................................... 411.1 Layout Guidelines ................................................. 21

7.1 Absolute Maximum Ratings ...................................... 411.2 Layout Example .................................................... 21

7.2 ESD Ratings.............................................................. 512 Device and Documentation Support................. 22

7.3 Recommended Operating Conditions....................... 512.1 Related Links ........................................................ 22

7.4 Thermal Information.................................................. 512.2 Community Resources.......................................... 22

7.5 Electrical Characteristics........................................... 612.3 Trademarks........................................................... 22

7.6 Typical Characteristics.............................................. 712.4 Electrostatic Discharge Caution............................ 22

8 Detailed Description.............................................. 912.5 Glossary................................................................ 22

8.1 Overview................................................................... 913 Mechanical, Packaging, and Orderable

8.2 Functional Block Diagram......................................... 9Information ........................................................... 22

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision C (April 2013) to Revision D Page

• Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional

Modes,Application and Implementation section, Power Supply Recommendations section, Layout section, Device

and Documentation Support section, and Mechanical, Packaging, and Orderable Information section .............................. 1

Changes from Revision B (November 2004) to Revision C Page

• Changed layout of National Data Sheet to TI format ........................................................................................................... 20

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SNVS773D –APRIL 2000–REVISED SEPTEMBER 2015

5 Device Comparison Table

Table 1. LM317 Family Options

PART / DATASHEET TEMPERATURE DESCRIPTION PRODUCT FOLDER

LM317-N 0 °C to 125 °C 40-V, 1.5-A Catalog device Click here

LM317A −40 °C to 125 °C 40-V, 1.5-A Industrial device Click here

LM317HV 0 °C to 125 °C 60-V, 1.5-A Catalog device Click here

LM317L-N −40 °C to 125 °C 40-V, 0.1-A, Industrial device Click here

LM117 −55 °C to 150 °C 40-V, 1.5-A Extended temperature device Click here

LM117HV −55 °C to 150 °C 60-V, 1.5-A Extended temperature device Click here

LM117HVQML −55 °C to 125 °C 60-V, 1.5-A Military grade device per spec MIL-PRF-38535 Click here

LM117HVQML-SP −55 °C to 125 °C 60V, 1.5-A Space grade device Click here

LM117JAN −55 °C to 125 °C 40-V, 1.5-A Military grade device per spec MIL-PRF-38510 Click here

LM117QML −55 °C to 125 °C 40-V, 1.5-A Military grade device per spec MIL-PRF-38535 Click here

LM117QML-SP −55 °C to 125 °C 40V, 1.5-A Space grade device Click here

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6 Pin Configuration and Functions

Metal Can NDS Package Metal Can NDT Package

2-Pin TO-3 3-pin TO-39

Bottom View Bottom View

NDE Package

3-Pin TO-220

Front View

Pin Functions

NAME I/O DESCRIPTION

TO-220

TO-39 NO. TO-3 NO. NO.

ADJ 2 1 1 — Adjust Pin

VOUT 3, CASE CASE 2, TAB O Output voltage pin for the regulator

VIN 1 2 3 I Input voltage pin for the regulator

7 Specifications

7.1 Absolute Maximum Ratings

See (1).MIN MAX UNIT

Power dissipation Internally limited

Input–output voltage differential −0.3 60 V

Lead temperature (soldering, 10 seconds) 300 °C

Storage temperature, Tstg −65 150 °C

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings

only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended

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

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SNVS773D –APRIL 2000–REVISED SEPTEMBER 2015

7.2 ESD Ratings VALUE UNIT

V(ESD) Electrostatic discharge Human body model (HBM)(1) ±2000 V

(1) Manufacturing with less than 500-V HBM is possible with the necessary precautions.

7.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted) MIN MAX UNIT

LM117HV −55 150 °C

Operating junction temperature LM317HV 0 125 °C

7.4 Thermal Information LM117HV, LM317HV LM317HV

NDT NDS NDE

THERMAL METRIC(1) UNIT

(TO-39) (TO-3) (TO-220)

3 PINS 2 PINS 3 PINS

RθJA Junction-to-ambient thermal resistance 140(2) 35(2) 23.0 °C/W

RθJC(top) Junction-to-case (top) thermal resistance 12 2.3 15.9 °C/W

RθJB Junction-to-board thermal resistance — — 4.6 °C/W

ψJT Junction-to-top characterization parameter — — 2.5 °C/W

ψJB Junction-to-board characterization parameter — — 4.6 °C/W

RθJC(bot) Junction-to-case (bottom) thermal resistance — — 0.9 °C/W

(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report, SPRA953.

(2) No Heat Sink

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7.5 Electrical Characteristics(1)

LM117HV LM317HV

PARAMETER TEST CONDITIONS UNIT

MIN TYP MAX MIN TYP MAX

TJ= 25°C 0.01 0.02 0.01 0.04 %/V

3 V ≤VIN −VOUT ≤

Line Regulation 60 V over full Operating 0.02 0.05 0.02 0.07 %/V

IL= 10 mA(2) Temperature Range

TJ= 25°C 0.1% 0.3% 0.1% 0.5%

10 mA ≤IOUT ≤

Load Regulation over full Operating

IMAX 0.3% 1% 0.3% 1.5%

Temperature Range

Thermal Regulation TJ= 25°C, 20 ms Pulse 0.03 0.07 0.04 0.07 %/W

Adjustment Pin Current 50 100 50 100 μA

Adjustment Pin Current 10 mA ≤IL≤IMAX 0.2 5 0.2 5 μA

Change 3 V ≤(VIN −VOUT)≤60 V

3 V ≤(VIN −VOUT)≤60 V

Reference Voltage 1.2 1.25 1.3 1.2 1.25 1.3 V

10 mA ≤IOUT ≤IMAX, P ≤PMAX

Temperature Stability TMIN ≤TJ≤TMAX 1% 1%

Minimum Load Current (VIN −VOUT) = 60 V 3.5 7 3.5 12 mA

TO-3, TO-220 1.5 2.2 3.5 1.5 2.2 3.7

(VIN −VOUT)≤Packages A

15 V TO-39 Package 0.5 0.8 1.8 0.5 0.8 1.9

Current Limit TO-3, TO-220 0.3 0.3

(VIN −VOUT)≤Packages A

60 V TO-39 Package 0.03 0.03

RMS Output Noise, % of TJ= 25°C, 10 Hz ≤f≤10 kHz 0.003% 0.003%

VOUT VOUT = 10V, f = 120 Hz 65 65 dB

Ripple Rejection Ratio CADJ = 10 μF 66 80 66 80 dB

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

(1) Unless otherwise specified, these specifications apply: −55°C ≤TJ≤+150°C for the LM117HV, and 0°C ≤TJ≤+125°C for the

LM317HV; VIN −VOUT = 5 V and IOUT = 0.1 A for the TO-39 package and IOUT = 0.5 A for the TO-3 and TO-220 packages. Although

power dissipation is internally limited, these specifications are applicable for power dissipations of 2 W for the TO-39 and 20 W for the

TO-3 and TO-220. IMAX is 1.5 A for the TO-3 and TO-220 and 0.5 A for the TO-39 package.

(2) Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects must be taken into account

separately. Pulse testing with low duty cycle is used.

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SNVS773D –APRIL 2000–REVISED SEPTEMBER 2015

7.6 Typical Characteristics

Output capacitor = 0 μF unless otherwise noted.

Figure 1. Load Regulation Figure 2. Current Limit

Figure 4. Dropout Voltage

Figure 3. Adjustment Current

Figure 5. Temperature Stability Figure 6. Minimum Operating Current

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Typical Characteristics (continued)

Output capacitor = 0 μF unless otherwise noted.

Figure 7. Ripple Rejection Figure 8. Ripple Rejection

Figure 9. Ripple Rejection Figure 10. Output Impedance

Figure 11. Line Transient Response Figure 12. Load Transient Response

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8 Detailed Description

8.1 Overview

In operation, the LM317HV develops a nominal 1.25-V 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 I1then flows through the output set resistor R2, giving an output voltage calculated

by Equation 1:

(1)

Figure 13. Adjustable VOUT Through R1 and R2

Because the 100-μA current from the adjustment terminal represents an error term, the LM317HV 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.

8.2 Functional Block Diagram

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8.3 Feature Description

8.3.1 Load Regulation

The LM317HV is capable of providing extremely good load regulation but a few precautions are needed to obtain

maximum performance. The current set resistor, R1, should be connected near the output terminal of the

regulator rather than near the load. If R1 is placed too far from the output terminal, then the increased trace

resistance, RS, will cause an error voltage drop in the adjustment loop and degrade load regulation performance.

Therefore, R1 should be placed as close as possible to the output terminal to minimize RSand maximize load

regulation performance.

Figure 14 shows the effect of the trace resistance, RS, when R1 is placed far from the output terminal of the

regulator. It is clear that RSwill cause an error voltage drop especially during higher current loads, so it is

important to minimize the RStrace resistance by keeping R1 close to the regulator output terminal.

Figure 14. Regulator With Line Resistance in Output Lead

With the TO-3 package, it is easy to minimize the resistance from the case to the set resistor, by using two

separate leads to the case. However, with the TO-39 package, take care to minimize the wire length of the

output lead. The ground of R2 can be returned near the ground of the load to provide remote ground sensing

and improve load regulation.

8.3.2 Current Limit

Internal current limit will be activated whenever the output current exceeds the limit indicated in Typical

Characteristics. However, if the regulators differential voltage exceeds the absolute maximum rating of 60 V

during a short-circuit condition (for example: VIN ≥60 V, VOUT = 0 V), internal junctions in the regulator may break

down and the device may be damaged or fail. Failure modes range from an apparent open or short from input to

output of the regulator, to a destroyed package (most common with the TO-220 package). To protect the

regulator, the user is advised to be aware of voltages that may be applied to the regulator during fault conditions

and to avoid violating the Absolute Maximum Ratings.

8.4 Device Functional Modes

8.4.1 External Capacitors

An input bypass capacitor is recommended. A 0.1-μF disc or 1-μF 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 LM317HV to improve ripple rejection. This bypass

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

the 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.

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Device Functional Modes (continued)

In general, the best type of capacitors to use are 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 1 μF of 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, a 0.01-μF disc may

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

Although the LM317HV 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 ensures stability. Any increase of

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

8.4.2 Protection Diodes

When external capacitors are used with any IC regulator it is sometimes necessary to add protection diodes to

prevent the capacitors from discharging through low current points into the regulator. Most 10-μF capacitors have

low enough internal series resistance to deliver 20-A spikes when shorted. Although the surge is short, there is

enough energy to damage parts of the IC.

When an output capacitor is connected to a regulator and the input is shorted, the output capacitor will discharge

into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage

of the regulator, and the rate of decrease of VIN. In the LM317HV, this discharge path is through a large junction

that is able to sustain 15-A surge with no problem. This is not true of other types of positive regulators. For

output capacitors of 25 μF or less, there is no need to use diodes.

The bypass capacitor on the adjustment terminal can discharge through a low current junction. Discharge occurs

when either the input or output is shorted. Internal to the LM317HV is a 50-Ωresistor which limits the peak

discharge current. No protection is needed for output voltages of 25 V or less and 10-μF capacitance. Figure 15

shows an LM317HV with protection diodes included for use with outputs greater than 25 V and high values of

output capacitance.

D1 protects against C1

D2 protects against C2

Figure 15. Regulator With Protection Diodes

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9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

The LMx17HV is a high voltage input capable linear regulator with overload protection. Due to its wide input

voltage range, the LMx17HV serves a variety of applications and provides a precise voltage regulation with low

dropout across a wide output voltage and load current range. The device regulates a constant 1.25 V between

VOUT and ADJ, so placing a fixed resistor between these pins provides a constant current regulation. Capacitors

at the input help filter the input power supply, while the output capacitors aid in transient response stability. A

bypass capacitor can be placed between ADJ pin and ground (across R2) to improve ripple rejection.

9.2 Typical Applications

9.2.1 1.25-V to 45-V High Voltage Adjustable Regulator

The LM117HV can be used as an adjustable regulator to allow a variety of output voltages for high voltage

applications. By using an adjustable R2 resistor, a variety of output voltages can be made possible as shown in

Figure 16.

Full output current not available at high input-output voltages

†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.

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

††

Figure 16. 1.25-V to 45-V High Voltage Adjustable Regulator

9.2.1.1 Design Requirements

The device component count is very minimal, employing two resistors as part of a voltage divider circuit and an

output capacitor for load regulation. An input capacitor is needed if the device is more than 6 inches from filter

capacitors. An optional bypass capacitor across R2 can also be used to improve PSRR.

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Typical Applications (continued)

9.2.1.2 Detailed Design Procedure

The output voltage is set based on the selection of the two resistors, R1 and R2, as shown in Figure 16. For

details on capacitor selection, refer to External Capacitors.

9.2.1.3 Application Curve

As shown in Figure 17, the maximum output current capability is limited by the input-output voltage differential,

package type, and junction temperature.

Figure 17. Current Limit

9.2.2 Digitally Selected Outputs

Figure 18 shows a digitally selectable output voltage. In its default state, all transistors are off and the output

voltage is set based on R1 and R2. By driving certain transistors, the associated resistor is connected in parallel

to R2, modifying the output voltage of the regulator.

*Sets maximum VOUT

Figure 18. Digitally Selected Outputs

9.2.3 Logic Regulator (5-V) With Electronic Shutdown

A variation of the 5-V output regulator application uses the LM117HV along with an NPN transistor to provide

shutdown control. The NPN will either block or sink the current from the ADJ pin by responding to the TTL pin

logic. When TTL is pulled high, the NPN is on and pulls the ADJ pin to GND, and the LM117HV outputs about

1.25 V. When TTL is pulled low, the NPN is off and the regulator outputs according to the programmed

adjustable voltage.

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NOTE: *Min. output ≈1.2 V

Figure 19. Logic Regulator (5-V) With Electronic Shutdown

9.2.4 Slow Turnon 15-V Regulator

An application of LM117HV includes a PNP transistor with a capacitor to implement slow turnon functionality. As

VIN rises, the PNP sinks current from the ADJ rail. The output voltage at start-up is the addition of the 1.25-V

reference plus the drop across the base to emitter. While this is happening, the capacitor begins to charge and

eventually opens the PNP. At this point, the device functions normally, regulating the output at 15 V. A diode is

placed between C1 and VOUT to provide a path for the capacitor to discharge. Such controlled turnon is useful for

limiting the in-rush current.

Figure 20. Slow Turnon 15-V Regulator

9.2.5 Adjustable Regulator With Improved Ripple Rejection

To improve ripple rejection, a capacitor is used to bypass the ADJ pin to GND. This is used to smooth output

ripple by cleaning the feedback path and stopping unnecessary noise from being fed back into the device,

propagating the noise.

†Solid tantalum

*Discharges C1 if output is shorted to ground

Figure 21. Adjustable Regulator With Improved Ripple Rejection

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9.2.6 High Stability 10-V Regulator

Using a high-stability shunt voltage reference in the feedback path, such as the LM329, provides damping

necessary for a stable, low noise output.

Figure 22. High Stability 10-V Regulator

9.2.7 High Current Adjustable Regulator

Using the LM195 power transistor in parallel with the LM117HV can increase the maximum possible output load

current. Sense resistor R1 provides the 0.6 V across base to emitter to turn on the PNP. This on switch allows

current to flow, and the voltage drop across R3 drives three LM195 power transistors designed to carry an

excess of 1 A each. Note the selection of R1 determines a minimum load current for the PNP to turn on. The

higher the resistor value, the lower the load current must be before the transistors turn on.

†Solid tantalum

*Minimum load current = 30 mA

‡Optional—improves ripple rejection

Figure 23. High Current Adjustable Regulator

9.2.8 Emitter Follower Current Amplifier

The LM117HV is used as a constant current source in this emitter follower circuit. The LM195 power transistor is

being used as a current gain amplifier, boosting the INPUT current. The LM117HV provides a stable current bias

than just using a resistor.

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Figure 24. Emitter Follower Current Amplifier

9.2.9 1-A Current Regulator

A simple, fixed-current regulator can be made by placing a resistor between the VOUT and ADJ pins of the

LM317HV. By regulating a constant 1.25 V between these two terminals, a constant current is delivered to the

load.

Figure 25. 1-A Current Regulator

9.2.10 Common Emitter Amplifier

Sometimes it is necessary to use a power transistor for high current gain. In this case, the LM117HV provides

constant current at the collector of the LM195 in this common emitter application. The 1.25-V reference between

VOUT and ADJ is maintained across the 2.4-Ωresistor, providing about 500-mA constant bias current into the

collector of the LM195.

Figure 26. Common Emitter Amplifier

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9.2.11 Low-Cost, 3-A Switching Regulator

The LM317HV can be used in a switching buck regulator application in cost-sensitive applications that require

high efficiency. The switch node above D1 oscillates between ground and VIN, as the voltage across sense

resistor R1 drives the power transistor on and off. This circuit exhibits self-oscillating behavior by negative

feedback through R6 and C3 to the ADJ pin of the LM317HV.

†Solid tantalum

*Core—Arnold A-254168-2 60 turns

Figure 27. Low-Cost, 3-A Switching Regulator

9.2.12 Adjustable Multiple On-Card Regulators With Single Control

This application shows how multiple LM117HV regulators can be controlled by setting one resistor. Because

each device maintains the reference voltage of about 1.25 V between its VOUT and ADJ pins, we can connect

each ADJ rail to a single resistor, setting the same output voltage across all devices. This allows for independent

outputs, each responding to its corresponding input only. Designers must also consider that by the nature of the

circuit, changes to R1 and R2 will affect all regulators.

NOTE: *All outputs within ±100 mV

†Minimum load—10 mA

Figure 28. Adjustable Multiple On-Card Regulators With Single Control

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9.2.13 AC Voltage Regulator

In Figure 29, the top regulator is +6 V above the bottom regulator. It is clear that when the input rises above +6 V

plus the dropout voltage, only the top LM317HV regulates +6 V at the output. When the input falls below –6 V

minus the dropout voltage, only the bottom LM317HV regulates –6 V at the output. For regions where the output

is not clipped, there is no regulation taking place, so we see the output follow the input.

Figure 29. AC Voltage Regulator

9.2.14 12-V Battery Charger

The LM317HV can be used in a battery charger application, where the device maintains either constant voltage

or constant current mode depending on the current charge of the battery. To do this, the part senses the voltage

drop across the battery and delivers the maximum charging current necessary to charge the battery. When the

battery charge is low, there exists a voltage drop across the sense resistor RS, providing constant current to the

battery at that instant. As the battery approaches full charge, the potential drop across RSapproaches zero,

reducing the current and maintaining the fixed voltage of the battery.

Use of RSallows low charging rates with fully charged battery.

**The 1000 μF is recommended to filter out input transients

Figure 30. 12-V Battery Charger

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9.2.15 Adjustable 4-A Regulator

Using three LM317HV devices in parallel increases load current capability. Output voltage is set by the variable

resistor tied to the non-inverting terminal of the op amp, and reference current to the transistor is developed

across the 100-Ωresistor. When output voltage rises, the op amp corrects by drawing current from the base,

closing the transistor. This effectively pulls ADJ down and lowers the output voltage through negative feedback.

Figure 31. Adjustable 4-A Regulator

9.2.16 Current Limited 6-V Charger

The current in a battery charger application is limited by switching between constant current and constant voltage

states. When the battery pulls low current, the drop across the 1-Ωresistor is not substantial and the NPN

remains off. A constant voltage is seen across the battery, as regulated by the resistor divider. When current

through the battery rises past peak current, the 1 Ωprovides enough voltage to turn the transistor on, pulling ADJ

close to ground. This results in limiting the maximum current to the battery.

Product Folder Links: LM117HV LM317HV

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LM317HV

SNVS773D –APRIL 2000–REVISED SEPTEMBER 2015

www.ti.com

*Sets peak current (0.6 A for 1 Ω)

**The 1000 μF is recommended to filter out input transients

Figure 32. Current Limited 6-V Charger

Product Folder Links: LM117HV LM317HV

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LM317HV

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SNVS773D –APRIL 2000–REVISED SEPTEMBER 2015

10 Power Supply Recommendations

Normally, no capacitors are needed unless the device is situated more than six inches from the input filter

capacitors, in which case an input bypass is needed. An optional output capacitor can be added to improve

transient response. The adjustment terminal can be bypassed to achieve very high ripple rejections ratios, which

are difficult to achieve with standard 3-terminal regulators. For information regarding capacitor selection, refer to

External Capacitors.

11 Layout

11.1 Layout Guidelines

Some layout guidelines should be followed to ensure proper regulation of the output voltage with minimum noise.

Traces carrying the load current should be wide to reduce the amount of parasitic trace inductance and the

feedback loop from V2to ADJ should be kept as short as possible. To improve PSRR, a bypass capacitor can be

placed at the ADJ pin and should be located as close as possible to the IC. In cases when VIN shorts to ground,

an external diode should be placed from VOUT to VIN to divert the surge current from the output capacitor and

protect the IC. Similarly, in cases when a large bypass capacitor is placed at the ADJ pin and VOUT shorts to

ground, an external diode should be placed from ADJ to VOUT to provide a path for the bypass capacitor to

discharge. These diodes should be placed close to the corresponding IC pins to increase their effectiveness.

11.2 Layout Example

Figure 33. Layout Example (TO-220 Package)

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12 Device and Documentation Support

12.1 Related Links

The table below lists quick access links. Categories include technical documents, support and community

resources, tools and software, and quick access to sample or buy.

Table 2. Related Links

TECHNICAL TOOLS & SUPPORT &

PARTS PRODUCT FOLDER SAMPLE & BUY DOCUMENTS SOFTWARE COMMUNITY

LM117HV Click here Click here Click here Click here Click here

LM317HV Click here Click here Click here Click here Click here

12.2 Community Resources

The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective

contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of

Use.

TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration

among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help

solve problems with fellow engineers.

Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and

contact information for technical support.

12.3 Trademarks

E2E is a trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

12.4 Electrostatic Discharge Caution

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.

12.5 Glossary

SLYZ022 —TI Glossary.

This glossary lists and explains terms, acronyms, and definitions.

13 Mechanical, Packaging, and Orderable Information

The following pages include mechanical, packaging, and orderable information. This information is the most

current data available for the designated devices. This data is subject to change without notice and revision of

this document. For browser-based versions of this data sheet, refer to the left-hand navigation.

Product Folder Links: LM117HV LM317HV

PACKAGE OPTION ADDENDUM

www.ti.com 18-Oct-2017

Addendum-Page 1

PACKAGING INFORMATION

Orderable Device Status

(1)

Package Type Package

Drawing Pins Package

Qty Eco Plan

(2)

Lead/Ball Finish

(6)

MSL Peak Temp

(3)

Op Temp (°C) Device Marking

(4/5)

Samples

LM117HVH ACTIVE TO NDT 3 500 Green (RoHS

& no Sb/Br) AU | Call TI Level-1-NA-UNLIM -55 to 125 ( LM117HVHP+, LM11

7HVHP+)

LM117HVH/NOPB ACTIVE TO NDT 3 500 Green (RoHS

& no Sb/Br) AU | Call TI Level-1-NA-UNLIM -55 to 125 ( LM117HVHP+, LM11

7HVHP+)

LM317HVT/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS

& no Sb/Br) CU SN Level-1-NA-UNLIM 0 to 125 LM317

HVT P+

(1) The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance

do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may

reference these types of products as "Pb-Free".

RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.

Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based

flame retardants must also meet the <=1000ppm threshold requirement.

(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.

(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation

of the previous line and the two combined represent the entire Device Marking for that device.

(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish

value exceeds the maximum column width.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information

provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and

continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.

TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

PACKAGE OPTION ADDENDUM

www.ti.com 18-Oct-2017

Addendum-Page 2

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

MECHANICAL DATA

NDE0003B

www.ti.com

MECHANICAL DATA

NDT0003A

www.ti.com

H03A (Rev D)

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