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LM317L 데이터시트 PDF




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부품번호 LM317L 기능
기능 3-Terminal Adjustable Regulator
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LM317L 데이터시트, 핀배열, 회로
March 2000
LM317L
3-Terminal Adjustable Regulator
General Description
The LM317L is an adjustable 3-terminal positive voltage
regulator capable of supplying 100mA over a 1.2V to 37V
output range. It is exceptionally easy to use and requires
only two external resistors to set the output voltage. Further,
both line and load regulation are better than standard fixed
regulators. Also, the LM317L is available packaged in a stan-
dard TO-92 transistor package which is easy to use.
In addition to higher performance than fixed regulators, the
LM317L offers full overload protection. Included on the chip
are current limit, thermal overload protection and safe area
protection. All overload protection circuitry remains fully func-
tional 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 rejection ratios which are difficult to achieve with stan-
dard 3-terminal regulators.
Besides replacing fixed regulators, the LM317L 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.
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
LM317L 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 LM317L is available in a standard TO-92 transistor
package, the SO-8 package, and 6-Bump micro SMD pack-
age. The LM317L is rated for operation over a −25˚C to
125˚C range.
Features
n Adjustable output down to 1.2V
n Guaranteed 100 mA output current
n Line regulation typically 0.01%V
n Load regulation typically 0.1%
n Current limit constant with temperature
n Eliminates the need to stock many voltages
n Standard 3-lead transistor package
n 80 dB ripple rejection
n Available in TO-92, SO-8, or 6-Bump micro SMD
package
n Output is short circuit protected
n See AN-1112 for micro SMD considerations
Connection Diagrams
TO-92 Plastic package
8-Pin SOIC
DS009064-4
DS009064-5
Top View
© 2000 National Semiconductor Corporation DS009064
www.national.com




LM317L pdf, 반도체, 판매, 대치품
Typical Performance Characteristics (Output capacitor = 0µF unless otherwise noted.)
Load Regulation
Current Limit
Adjustment Current
DS009064-34
Dropout Voltage
DS009064-35
Reference Voltage
Temperature Stability
DS009064-36
DS009064-37
Minimum Operating Current
DS009064-38
www.national.com
4
DS009064-39

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LM317L 전자부품, 판매, 대치품
Application Hints (Continued)
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 10µF capacitors have low enough in-
ternal series resistance to deliver 20A spikes when shorted.
Although the surge is short, there is enough energy to dam-
age 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 regu-
lator, and the rate of decrease of VIN. In the LM317L, this dis-
charge path is through a large junction that is able to sustain
a 2A surge with no problem. This is not true of other types of
positive regulators. For output capacitors of 25 µF or less,
the LM317L’s ballast resistors and output structure limit the
peak current to a low enough level so that there is no need
to use a protection diode.
The bypass capacitor on the adjustment terminal can dis-
charge through a low current junction. Discharge occurs
when either the input or output is shorted. Internal to the
LM317L is a 50resistor which limits the peak discharge
current. No protection is needed for output voltages of 25V
or less and 10µF capacitance. Figure 3 shows an LM317L
with protection diodes included for use with outputs greater
than 25V and high values of output capacitance.
DS009064-9
D1 protects against C1
D2 protects against C2
FIGURE 3. Regulator with Protection Diodes
LM317L micro SMD Light Sensitivity
Exposing the LM317L micro SMD package to bright sunlight
may cause the VREF to drop. In a normal office environment
of fluorescent lighting the output is not affected. The LM317
micro SMD does not sustain permanent damage from light
exposure. Removing the light source will cause LM317L’s
VREF to recover to the proper value.
7 www.national.com

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