Linear Regulators - Standard

LM317HVT

Manufacturer Part NumberLM317HVT
DescriptionLinear Regulators - Standard
ManufacturerFairchild Semiconductor
LM317HVT datasheet
 


Specifications of LM317HVT

PolarityPositiveNumber Of Outputs1
Output TypeAdjustableOutput Voltage1.2 V to 57 V
Output Current2.2 ALine Regulation0.04 % / V
Load Regulation25 mV % / VMaximum Operating Temperature+ 125 C
Minimum Operating Temperature0 CPackage / CaseTO-220
Mounting StyleThrough HoleReference Voltage1.3 V
Lead Free Status / Rohs StatusLead free / RoHS Compliant  
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LM117HV/LM317HV
3-Terminal Adjustable Regulator
General Description
The LM117HV/LM317HV are adjustable 3-terminal positive
voltage regulators capable of supplying in excess of 1.5A
over a 1.2V to 57V output range. They are exceptionally
easy to use and require only two external resistors to set the
output voltage. Further, both line and load regulation are bet-
ter than standard fixed regulators. Also, the LM117HV is
packaged in standard transistor packages which are easily
mounted and handled.
In addition to higher performance than fixed regulators, the
LM117HV series offers full overload protection available only
in IC’s. Included on the chip are current limit, thermal over-
load protection and safe area protection. All overload protec-
tion circuitry remains fully functional even if the adjustment
terminal is disconnected.
Normally, no capacitors are needed unless the device is situ-
ated 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 rejections ratios which are difficult to achieve with
standard 3-terminal regulators.
Besides replacing fixed regulators, the LM117HV is useful in
a wide variety of other applications. Since the regulator is
“floating” and sees only the input-to-output differential volt-
age, supplies of several hundred volts can be regulated as
long as the maximum input to output differential is not ex-
ceeded, i.e. do not short the output to ground.
Typical Applications
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.
© 2000 National Semiconductor Corporation
Also, it makes an especially simple adjustable switching
regulator, a programmable output regulator, or by connecting
a fixed resistor between the adjustment and output, the
LM117HV can be used as a precision current regulator. Sup-
plies with electronic shutdown can be achieved by clamping
the adjustment terminal to ground which programs the out-
put to 1.2V where most loads draw little current.
The LM117HVK STEEL and LM317HVK STEEL are pack-
aged in standard TO-3 transistor packages, while the
LM117HVH and LM317HVH are packaged in a solid Kovar
base TO-39 transistor package. The LM317HVT uses a TO-
220 plastic package. The LM117HV is rated for operation
from −55˚C to +150˚C, and the LM317HV from 0˚C to
+125˚C.
Features
n Adjustable output down to 1.2V
n Guaranteed 1.5A output current
n Line regulation typically 0.01%/V
n Load regulation typically 0.1%
n Current limit constant with temperature
n 100% electrical burn-in
n Eliminates the need to stock many voltages
n Standard 3-lead transistor package
n 80 dB ripple rejection
n Output is short-circuit protected
+
n P
Product Enhancement tested
1.2V-45V Adjustable Regulator
DS009062-1
DS009062
April 2000
www.national.com

LM317HVT Summary of contents

  • Page 1

    ... TO-3 transistor packages, while the LM117HVH and LM317HVH are packaged in a solid Kovar base TO-39 transistor package. The LM317HVT uses a TO- 220 plastic package. The LM117HV is rated for operation from −55˚C to +150˚C, and the LM317HV from 0˚C to +125˚ ...

  • Page 2

    Typical Applications (Continued) Digitally Selected Outputs *Sets maximum V OUT www.national.com 5V Logic Regulator with Electronic Shutdown *Min. output 1.2V DS009062 DS009062-3 ...

  • Page 3

    Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (Note 4) Power Dissipation Input — Output Voltage Differential Electrical Characteristics Parameter Line Regulation T (Note 3) I Load ...

  • Page 4

    Typical Performance Characteristics Load Regulation DS009062-32 Dropout Voltage DS009062-35 Ripple Rejection DS009062-38 Output Impedance DS009062-41 www.national.com Output capacitor = 0 µF unless otherwise noted. Current Limit DS009062-33 Temperature Stability DS009062-36 Ripple Rejection DS009062-39 Line Transient Response DS009062-42 4 Adjustment Current ...

  • Page 5

    Application Hints In operation, the LM117HV develops a nominal 1.25V refer- ence voltage between the output and adjustment ter- REF minal. The reference voltage is impressed across program resistor R1 and, since the voltage is constant, a constant ...

  • Page 6

    Application Hints (Continued) or less and 10 µF capacitance. Figure 3 shows an LM117HV with protection diodes included for use with outputs greater than 25V and high values of output capacitance. Current Limit Internal current limit will be activated whenever ...

  • Page 7

    Typical Applications (Continued) High Stability 10V Regulator 0 to 30V Regulator DS009062-13 Full output current not available at high input-output voltages High Current Adjustable Regulator DS009062-11 † Solid tantalum *Minimum load current = 30 mA ‡ Optional — improves ripple ...

  • Page 8

    Typical Applications (Continued) † Solid tantalum *Lights in constant current mode 1A Current Regulator www.national.com 5A Constant Voltage/Constant Current Regulator DS009062-16 *Minimum load current 8 DS009062-15 1.2V–20V Regulator with Minimum Program Current DS009062- ...

  • Page 9

    Typical Applications (Continued) High Gain Amplifier DS009062-18 4A Switching Regulator with Overload Protection † Solid tantalum *Core — Arnold A-254168-2 60 turns Low Cost 3A Switching Regulator † Solid tantalum *Core — Arnold A-254168-2 60 turns DS009062-20 9 DS009062-19 www.national.com ...

  • Page 10

    Typical Applications (Continued) Precision Current Limiter * 0.8 R1 120 ± *All outputs within 100 mV † Minimum load — Voltage Regulator www.national.com Tracking Preregulator DS009062-21 Adjustable Multiple On-Card Regulators with Single Control * 12V Battery Charger ...

  • Page 11

    Typical Applications (Continued Constant Current Battery Charger Adjustable 4A Regulator Current Limited 6V Charger DS009062-26 * Sets peak current (0.6A for The 1000 µF is recommended to filter out input transients DS009062-27 11 DS009062-28 www.national.com ...

  • Page 12

    ... See NS Package Number K02A www.national.com (See Physical Dimension section for further information) (TO-39) Metal Can Package DS009062-30 Case is Output Bottom View Order Number LM117HVH, LM117HVH/883 or LM317HVH See NS Package Number H03A 12 (TO-220) Plastic Package DS009062-31 Front View Order Number LM317HVT See NS Package Number T03B ...

  • Page 13

    Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM117HVH, LM117HVH/883, or LM317HVH NS Package Number H03A Metal Can Package (K) Order Number LM317HVK STEEL NS Package Number K02A 13 www.national.com ...

  • Page 14

    ... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) Metal Can Package (K) Mil-Aero Product Order Number LM117HVKSTL/883 NS Package Number K02C Order Number LM317HVT NS Package Number T03B 14 ...

  • Page 15

    LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support ...