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LM338KSTEEL Folha de dados(PDF) 1 Page - Texas Instruments

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Nome de Peças LM338KSTEEL
Descrição Electrónicos  LM138/LM338 5-Amp Adjustable Regulators
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
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LM338KSTEEL Folha de dados(HTML) 1 Page - Texas Instruments

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LM138, LM338
www.ti.com
SNVS771B – MAY 1998 – REVISED APRIL 2013
LM138/LM338 5-Amp Adjustable Regulators
Check for Samples: LM138, LM338
A unique feature of the LM138 family is time-
1
FEATURES
dependent current limiting. The current limit circuitry
2
Specified 7A Peak Output Current
allows peak currents of up to 12A to be drawn from
Specified 5A Output Current
the regulator for short periods of time. This allows the
LM138 to be used with heavy transient loads and
Adjustable Output Down to 1.2V
speeds start-up under full-load conditions. Under
Specified Thermal Regulation
sustained
loading
conditions,
the
current
limit
Current Limit Constant with Temperature
decreases to a safe value protecting the regulator.
Also included on the chip are thermal overload
P+ Product Enhancement Tested
protection and safe area protection for the power
Output is Short-Circuit Protected
transistor. Overload protection remains functional
even
if
the
adjustment
pin
is
accidentally
APPLICATIONS
disconnected.
Adjustable Power Supplies
Normally, no capacitors are needed unless the device
Constant Current Regulators
is situated more than 6 inches from the input filter
capacitors in which case an input bypass is needed.
Battery Chargers
An output capacitor can be added to improve
transient response, while bypassing the adjustment
DESCRIPTION
pin will increase the regulator's ripple rejection.
The LM138 series of adjustable 3-terminal positive
voltage regulators is capable of supplying in excess
Besides
replacing
fixed
regulators
or
discrete
of 5A over a 1.2V to 32V output range. They are
designs, the LM138 is useful in a wide variety of
exceptionally easy to use and require only 2 resistors
other applications. Since the regulator is “floating”
to set the output voltage. Careful circuit design has
and sees only the input-to-output differential voltage,
resulted
in
outstanding
load
and
line
supplies of several hundred volts can be regulated as
regulation—comparable to many commercial power
long as the maximum input to output differential is not
supplies. The LM138 family is supplied in a standard
exceeded, i.e., do not short-circuit output to ground.
3-lead transistor package.
The part numbers in the LM138 series which have a
K suffix are packaged in a standard Steel TO-3
package, while those with a T suffix are packaged in
a TO-220 plastic package. The LM138 is rated for
−55°C ≤ TJ ≤ +150°C, and the LM338 is rated for 0°C
≤ TJ ≤ +125°C.
Connection Diagram
Connection Diagrams
Figure 1. (TO-3) Metal Can Package
Figure 2. (TO-220) Plastic Package
Bottom View
Front View
See Package Number NDS0002A
See Package Number NDE0003B
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 1998–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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