LM2587T-ADJ National Semiconductor, LM2587T-ADJ Datasheet

DC/DC Converter IC

LM2587T-ADJ

Manufacturer Part Number
LM2587T-ADJ
Description
DC/DC Converter IC
Manufacturer
National Semiconductor
Datasheets

Specifications of LM2587T-ADJ

Input Voltage
40V
Output Voltage
37V
No. Of Pins
5
Termination Type
Through Hole
Mounting Type
Through Hole
Output Current Max
5A
Peak Reflow Compatible (260 C)
No
Supply Voltage Max
40V
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

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LM2587T-ADJ
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© 2004 National Semiconductor Corporation
Ordering Information
5-Lead TO-220 Bent, Staggered Leads
5-Lead TO-263
5-Lead TO-263 Tape and Reel
LM2587
SIMPLE SWITCHER
General Description
The LM2587 series of regulators are monolithic integrated
circuits specifically designed for flyback, step-up (boost), and
forward converter applications. The device is available in 4
different output voltage versions: 3.3V, 5.0V, 12V, and ad-
justable.
Requiring a minimum number of external components, these
regulators are cost effective, and simple to use. Included in
the datasheet are typical circuits of boost and flyback regu-
lators. Also listed are selector guides for diodes and capaci-
tors and a family of standard inductors and flyback trans-
formers designed to work with these switching regulators.
The power switch is a 5.0A NPN device that can stand-off
65V. Protecting the power switch are current and thermal
limiting circuits, and an undervoltage lockout circuit. This IC
contains a 100 kHz fixed-frequency internal oscillator that
permits the use of small magnetics. Other features include
soft start mode to reduce in-rush current during start up,
current mode control for improved rejection of input voltage
and output load transients and cycle-by-cycle current limit-
ing. An output voltage tolerance of
input voltages and output load conditions, is guaranteed for
the power supply system.
Flyback Regulator
SIMPLE SWITCHER
Package Type
®
and Switchers Made Simple
®
are registered trademarks of National Semiconductor Corporation.
±
4%, within specified
DS012316
®
NSC Package
5A Flyback Regulator
Drawing
T05D
TS5B
TS5B
LM2587T-3.3, LM2587T-5.0, LM2587T-12, LM2587T-ADJ
LM2587S-3.3, LM2587S-5.0, LM2587S-12, LM2587S-ADJ
LM2587SX-3.3, LM2587SX-5.0, LM2587SX-12,
LM2587SX-ADJ
Features
n Requires few external components
n Family of standard inductors and transformers
n NPN output switches 5.0A, can stand off 65V
n Wide input voltage range: 4V to 40V
n Current-mode operation for improved transient
n 100 kHz switching frequency
n Internal soft-start function reduces in-rush current during
n Output transistor protected by current limit, under
n System Output Voltage Tolerance of
Typical Applications
n Flyback regulator
n Multiple-output regulator
n Simple boost regulator
n Forward converter
response, line regulation, and current limit
start-up
voltage lockout, and thermal shutdown
and load conditions
Order Number
01231601
±
4% max over line
February 2004
www.national.com

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