Texas Instruments | LM317HV-MIL High Voltage Three-Terminal Adjustable Regulator With Overload Protection | Datasheet | Texas Instruments LM317HV-MIL High Voltage Three-Terminal Adjustable Regulator With Overload Protection Datasheet

Texas Instruments LM317HV-MIL High Voltage Three-Terminal Adjustable Regulator With Overload Protection Datasheet
Product
Folder
Order
Now
Technical
Documents
Support &
Community
Tools &
Software
LM317HV-MIL
SNVSAY1 – JUNE 2017
LM317HV-MIL High Voltage Three-Terminal Adjustable Regulator With Overload
Protection
1 Features
3 Description
•
•
•
•
•
•
•
•
The LM317HV-MIL is an adjustable 3-terminal
positive voltage regulator capable of supplying 1.5 A
or more currents over a 1.25-V to 57-V output voltage
range. It requires only two external resistors to set the
output voltage. The LM317HV-MIL is packaged in
standard transistor packages that are easily mounted
and handled.
1
Up to 60 V Input to Output Differential
1.5-A Output Current
Line Regulation 0.01%/V (Typical)
Load Regulation 0.1% (Typical)
80-dB Ripple Rejection (Typical)
Internal Short-Circuit Current Limiting Protection
Thermal Overload Protection
0 to 125°C Operating Temperature Range
2 Applications
•
•
•
•
•
Industrial Power Supplies
PLC Systems
Factory Automation Systems
Building Automation Systems
Battery Charger
1.2-V to 50-V Adjustable Regulator With High
Voltage Input
The LM317HV-MIL offers overload protection like
current limit, thermal overload protection and safe
area protection, which make the device blowout
proof. The overload protection circuitry remains fully
functional even if the adjustment terminal is
disconnected.
Typically, no capacitors are needed unless the device
is situated more than 6 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 rejection ratios
which are difficult to achieve with standard 3-terminal
regulators.
Since the regulator is floating and sees only the inputto-output differential voltage, supplies of several
hundred volts can be regulated as long as the
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 LM317HV-MIL 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)
*Needed if device is more than 6 inches from filter
capacitors. .
†Optional—improves transient response
††
VOUT
æ R2 ö
= 1.25 V ç 1 +
+ I ADJ (R2 )
R1 ÷ø
è
PART NUMBER
LM317HV-MIL
PACKAGE
BODY SIZE (NOM)
TO-39 (3)
8.255 mm × 8.255 mm
TO-3 (2)
19.507 mm × 19.507 mm
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.
1
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.
LM317HV-MIL
SNVSAY1 – JUNE 2017
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
4
6.1
6.2
6.3
6.4
6.5
6.6
4
4
4
4
5
6
Absolute Maximum Ratings ......................................
ESD Ratings..............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics...........................................
Typical Characteristics ..............................................
Detailed Description .............................................. 8
7.1 Overview ................................................................... 8
7.2 Functional Block Diagram ......................................... 8
7.3 Feature Description................................................... 9
7.4 Device Functional Modes.......................................... 9
8
Application and Implementation ........................ 11
8.1 Application Information............................................ 11
8.2 Typical Applications ............................................... 11
9 Power Supply Recommendations...................... 20
10 Layout................................................................... 20
10.1 Layout Guidelines ................................................. 20
10.2 Layout Example .................................................... 20
11 Device and Documentation Support ................. 21
11.1
11.2
11.3
11.4
11.5
Related Links ........................................................
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
21
21
21
21
21
12 Mechanical, Packaging, and Orderable
Information ........................................................... 21
4 Revision History
2
DATE
REVISION
NOTES
June 2017
*
Initial Release
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
LM317HV-MIL
www.ti.com
SNVSAY1 – JUNE 2017
5 Pin Configuration and Functions
Metal Can NDS Package
2-Pin TO-3
Bottom View
Metal Can NDT Package
3-pin TO-39
Bottom View
NDE Package
3-Pin TO-220
Front View
Pin Functions
PIN
NAME
TO-39 NO.
TO-3 NO.
TO-220
NO.
I/O
ADJ
2
1
1
—
Adjust Pin
VOUT
3, CASE
CASE
2, TAB
O
Output voltage pin for the regulator
1
2
3
I
Input voltage pin for the regulator
VIN
DESCRIPTION
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
3
LM317HV-MIL
SNVSAY1 – JUNE 2017
www.ti.com
6 Specifications
6.1 Absolute Maximum Ratings
(1)
See
.
MIN
Power dissipation
MAX
−0.3
Input–output voltage differential
Lead temperature (soldering, 10 seconds)
−65
Storage temperature, Tstg
(1)
UNIT
Internally limited
60
V
300
°C
150
°C
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.
6.2 ESD Ratings
V(ESD)
(1)
Electrostatic discharge
Human body model (HBM) (1)
VALUE
UNIT
±2000
V
Manufacturing with less than 500-V HBM is possible with the necessary precautions.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
Operating junction temperature
MIN
MAX
UNIT
0
125
°C
6.4 Thermal Information
LM317HV
THERMAL METRIC (1)
NDT
(TO-39)
NDS
(TO-3)
NDE
(TO-220)
3 PINS
2 PINS
3 PINS
Junction-to-ambient thermal resistance
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
(2)
4
35
(2)
RθJA
(1)
140
(2)
UNIT
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
No Heat Sink
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
LM317HV-MIL
www.ti.com
SNVSAY1 – JUNE 2017
6.5 Electrical Characteristics (1)
PARAMETER
TEST CONDITIONS
Line Regulation
3 V ≤ VIN − VOUT ≤ 60 V
IL = 10 mA (2)
Load Regulation
10 mA ≤ IOUT ≤ IMAX
Thermal Regulation
TJ = 25°C, 20 ms Pulse
TYP
MAX
UNIT
TJ = 25°C
MIN
0.01
0.04
%/V
over full Operating
Temperature Range
0.02
0.07
%/V
TJ = 25°C
0.1%
0.5%
over full Operating
Temperature Range
0.3%
1.5%
0.04
0.07
%/W
50
100
μA
0.2
5
μA
1.25
1.3
V
mA
Adjustment Pin Current
Adjustment Pin Current Change
10 mA ≤ IL ≤ IMAX
3 V ≤ (VIN − VOUT) ≤ 60 V
Reference Voltage
3 V ≤ (VIN − VOUT) ≤ 60 V
10 mA ≤ IOUT ≤ IMAX, P ≤ PMAX
Temperature Stability
TMIN ≤ TJ ≤ TMAX
Minimum Load Current
(VIN − VOUT) = 60 V
Ripple Rejection Ratio
Long-Term Stability
(1)
(2)
1%
3.5
12
(VIN − VOUT) ≤ 15
V
TO-3, TO-220 Packages
1.5
2.2
3.7
TO-39 Package
0.5
0.8
1.9
(VIN − VOUT) ≤ 60
V
TO-3, TO-220 Packages
Current Limit
RMS Output Noise, % of VOUT
1.2
0.3
TO-39 Package
0.003%
VOUT = 10V, f = 120 Hz
CADJ = 10 μF
65
66
TJ = 125°C
A
0.03
TJ = 25°C, 10 Hz ≤ f ≤ 10 kHz
A
dB
80
0.3%
dB
1%
Unless otherwise specified, these specifications apply: 0°C ≤ TJ ≤ +125°C; 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.
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.
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
5
LM317HV-MIL
SNVSAY1 – JUNE 2017
www.ti.com
6.6 Typical Characteristics
Output capacitor = 0 μF unless otherwise noted.
6
Figure 1. Load Regulation
Figure 2. Current Limit
Figure 3. Adjustment Current
Figure 4. Dropout Voltage
Figure 5. Temperature Stability
Figure 6. Minimum Operating Current
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
LM317HV-MIL
www.ti.com
SNVSAY1 – JUNE 2017
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
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
7
LM317HV-MIL
SNVSAY1 – JUNE 2017
www.ti.com
7 Detailed Description
7.1 Overview
In operation, the LM317HV-MIL 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 I1 then flows through the output set resistor R2, giving an output voltage calculated
by Equation 1:
æ R2 ö
VOUT = VREF ç 1 +
+ I ADJ (R2 )
R1 ÷ø
è
(1)
Figure 13. Adjustable VOUT Through R1 and R2
Because the 100-μA current from the adjustment terminal represents an error term, the LM317HV-MIL 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.
7.2 Functional Block Diagram
8
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
LM317HV-MIL
www.ti.com
SNVSAY1 – JUNE 2017
7.3 Feature Description
7.3.1 Load Regulation
The LM317HV-MIL 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 RS and 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 RS will cause an error voltage drop especially during higher current loads, so it is
important to minimize the RS trace 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.
7.3.2 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.
7.4 Device Functional Modes
7.4.1 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-MIL 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.
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
9
LM317HV-MIL
SNVSAY1 – JUNE 2017
www.ti.com
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-MIL 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.
7.4.2 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-MIL, 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-MIL is a 50-Ω resistor 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-MIL with protection diodes included for use with outputs greater than 25 V and high values
of output capacitance.
æ R2 ö
VOUT = 1.25 V ç 1 +
+ I ADJ (R2 )
R1 ÷ø
è
D1 protects against C1
D2 protects against C2
Figure 15. Regulator With Protection Diodes
10
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
LM317HV-MIL
www.ti.com
SNVSAY1 – JUNE 2017
8 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.
8.1 Application Information
The LM317HV-MIL is a high voltage input capable linear regulator with overload protection. Due to its wide input
voltage range, the LM317HV-MIL 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.
8.2 Typical Applications
8.2.1 1.25-V to 45-V High Voltage Adjustable Regulator
The device 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.
æ R2 ö
VOUT = 1.25 V ç 1 +
+ I ADJ (R2 )
R1 ÷ø
è
††
Figure 16. 1.25-V to 45-V High Voltage Adjustable Regulator
8.2.1.1 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.
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
11
LM317HV-MIL
SNVSAY1 – JUNE 2017
www.ti.com
Typical Applications (continued)
8.2.1.2 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.
8.2.1.3 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
8.2.2 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
8.2.3 Logic Regulator (5-V) With Electronic Shutdown
A variation of the 5-V output regulator application uses the LM317HV-MIL 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 device outputs
about 1.25 V. When TTL is pulled low, the NPN is off and the regulator outputs according to the programmed
adjustable voltage.
12
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
LM317HV-MIL
www.ti.com
SNVSAY1 – JUNE 2017
NOTE: *Min. output ≈ 1.2 V
Figure 19. Logic Regulator (5-V) With Electronic Shutdown
8.2.4 Slow Turnon 15-V Regulator
An application of LM317HV-MIL 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
8.2.5 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
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
13
LM317HV-MIL
SNVSAY1 – JUNE 2017
www.ti.com
8.2.6 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
8.2.7 High Current Adjustable Regulator
Using the LM195 power transistor in parallel with the LM317HV-MIL 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
8.2.8 Emitter Follower Current Amplifier
The device 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 device provides a stable current bias
than just using a resistor.
14
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
LM317HV-MIL
www.ti.com
SNVSAY1 – JUNE 2017
Figure 24. Emitter Follower Current Amplifier
8.2.9 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-MIL. 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
8.2.10 Common Emitter Amplifier
Sometimes it is necessary to use a power transistor for high current gain. In this case, the LM317HV-MIL
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-Ω resistor, providing about 500-mA constant bias current
into the collector of the LM195.
Figure 26. Common Emitter Amplifier
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
15
LM317HV-MIL
SNVSAY1 – JUNE 2017
www.ti.com
8.2.11 Low-Cost, 3-A Switching Regulator
The LM317HV-MIL 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-MIL.
†Solid tantalum
*Core—Arnold A-254168-2 60 turns
Figure 27. Low-Cost, 3-A Switching Regulator
8.2.12 Adjustable Multiple On-Card Regulators With Single Control
This application shows how multiple LM317HV-MIL 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 affect all regulators.
NOTE: *All
†Minimum load—10 mA
outputs
within
±100
mV
Figure 28. Adjustable Multiple On-Card Regulators With Single Control
16
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
LM317HV-MIL
www.ti.com
SNVSAY1 – JUNE 2017
8.2.13 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-MIL regulates +6 V at the output. When the input falls below –6
V minus the dropout voltage, only the bottom LM317HV-MIL 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
8.2.14 12-V Battery Charger
The LM317HV-MIL 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 RS
approaches zero, reducing the current and maintaining the fixed voltage of the battery.
æ R2 ö
RS sets output impedance of charger ZOUT = RS ç 1 +
R1 ÷ø
è
Use of RS allows low charging rates with fully charged battery.
**The 1000 μF is recommended to filter out input transients
Figure 30. 12-V Battery Charger
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
17
LM317HV-MIL
SNVSAY1 – JUNE 2017
www.ti.com
8.2.15 Adjustable 4-A Regulator
Using three LM317HV-MIL 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-Ω resistor. 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
8.2.16 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-Ω resistor 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 Ω provides enough voltage to turn the transistor on, pulling ADJ
close to ground. This results in limiting the maximum current to the battery.
18
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
LM317HV-MIL
www.ti.com
SNVSAY1 – JUNE 2017
*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
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
19
LM317HV-MIL
SNVSAY1 – JUNE 2017
www.ti.com
9 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.
10 Layout
10.1 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 V2 to 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.
10.2 Layout Example
Figure 33. Layout Example (TO-220 Package)
20
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
LM317HV-MIL
www.ti.com
SNVSAY1 – JUNE 2017
11 Device and Documentation Support
11.1 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 1. Related Links
PARTS
PRODUCT FOLDER
SAMPLE & BUY
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
LM317HV-MIL
Click here
Click here
Click here
Click here
Click here
11.2 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.
11.3 Trademarks
E2E is a trademark of Texas Instruments.
11.4 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.
11.5 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 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.
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: LM317HV-MIL
21
PACKAGE OPTION ADDENDUM
www.ti.com
15-Oct-2019
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
LM317HVH
ACTIVE
TO
NDT
3
500
Green (RoHS
& no Sb/Br)
AU
Level-1-NA-UNLIM
0 to 0
( LM317HVHP+, LM31
7HVHP+)
LM317HVH/NOPB
ACTIVE
TO
NDT
3
500
Green (RoHS
& no Sb/Br)
AU
Level-1-NA-UNLIM
0 to 0
( LM317HVHP+, LM31
7HVHP+)
LM317HVK STEEL
ACTIVE
TO-3
NDS
2
50
TBD
Call TI
Call TI
0 to 0
LM317HVK
STEELP+
LM317HVK STEEL/NOPB
ACTIVE
TO-3
NDS
2
50
Green (RoHS
& no Sb/Br)
Call TI
Level-1-NA-UNLIM
0 to 0
LM317HVK
STEELP+
(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
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
15-Oct-2019
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.
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.
Addendum-Page 2
MECHANICAL DATA
NDS0002A
www.ti.com
MECHANICAL DATA
NDT0003A
H03A (Rev D)
www.ti.com
IMPORTANT NOTICE AND DISCLAIMER
TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATASHEETS), DESIGN RESOURCES (INCLUDING REFERENCE
DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS”
AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY
IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD
PARTY INTELLECTUAL PROPERTY RIGHTS.
These resources are intended for skilled developers designing with TI products. You are solely responsible for (1) selecting the appropriate
TI products for your application, (2) designing, validating and testing your application, and (3) ensuring your application meets applicable
standards, and any other safety, security, or other requirements. These resources are subject to change without notice. TI grants you
permission to use these resources only for development of an application that uses the TI products described in the resource. Other
reproduction and display of these resources is prohibited. No license is granted to any other TI intellectual property right or to any third
party intellectual property right. TI disclaims responsibility for, and you will fully indemnify TI and its representatives against, any claims,
damages, costs, losses, and liabilities arising out of your use of these resources.
TI’s products are provided subject to TI’s Terms of Sale (www.ti.com/legal/termsofsale.html) or other applicable terms available either on
ti.com or provided in conjunction with such TI products. TI’s provision of these resources does not expand or otherwise alter TI’s applicable
warranties or warranty disclaimers for TI products.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2019, Texas Instruments Incorporated
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising