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LM317L-N 数据表(PDF) 1 Page - Texas Instruments

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部件名 LM317L-N
功能描述  3-Terminal Adjustable Regulator
Download  37 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM317L-N 数据表(HTML) 1 Page - Texas Instruments

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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.
LM317L-N
SNVS775K – MARCH 2000 – REVISED APRIL 2016
LM317L-N 3-Terminal Adjustable Regulator
1
1 Features
1
Adjustable Output Down to 1.2 V
100-mA Output Current
Line Regulation Typically 0.01% V
Load Regulation Typically 0.1%
Current Limit Constant With Temperature
Eliminates the Need to Stock Many Voltages
Standard 3-Lead Transistor Package
80-dB Ripple Rejection
Available in 3-Pin TO-92, 8-Pin SOIC, or 6-pin
DSBGA Packages
Output is Short-Circuit Protected
See AN-1112 (SNVA009) for DSBGA
Considerations
2 Applications
Automotive LED Lighting
Battery Chargers
Post Regulation for Switching Supplies
Constant-Current Regulators
Microprocessor Supplies
Schematic Diagram
Full output current not available at high
input-output voltages
†Optional—improves transient response
*Needed if device is more than 6 inches
from filter capacitors
3 Description
The LM317L-N is an adjustable 3-terminal positive
voltage regulator capable of supplying 100 mA over a
1.2-V to 37-V output range. The LM317L-N is easy to
use and requires only two external resistors to set the
output voltage. Both line and load regulation are
better than standard fixed regulators. The LM317L-N
is available packaged in a standard, easy-to-use
TO-92 transistor package.
In
addition
to
higher
performance
than
fixed
regulators,
the
LM317L-N
offers
full
overload
protection. 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.
Normally, no capacitors are required unless the
device is situated more than 6 inches from the input
filter capacitors, in which case an input bypass is
required. 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.
Besides replacing fixed regulators, the LM317L-N is
useful in a wide variety of other applications. Because
the regulator is floating and sees only the input-to-
output
differential
voltage,
supplies
of
several
hundred
volts
can
be
regulated,
provided
the
maximum input-to-output differential is not exceeded.
The LM317L-N makes a simple adjustable switching
regulator, a programmable output regulator, or by
connecting a fixed resistor between the adjustment
and output, the LM317L-N can 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 1.2 V, where
most loads draw little current.
The LM317L-N is available in a standard 3-pin TO-92
transistor package, the 8-pin SOIC package, and 6-
pin DSBGA package. The LM317L-N is rated for
operation over a
−40°C to 125°C range.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM317L-N
TO-92 (3)
4.30 mm × 4.30 mm
SOIC (8)
3.91 mm × 4.90 mm
DSBGA (6)
1.68 mm × 1.019 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.


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