LM2585SX-ADJ National Semiconductor, LM2585SX-ADJ Datasheet

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LM2585SX-ADJ

Manufacturer Part Number
LM2585SX-ADJ
Description
IC,SMPS CONTROLLER,CURRENT-MODE,BIPOLAR,SIP,5PIN,PLASTIC
Manufacturer
National Semiconductor
Datasheets

Specifications of LM2585SX-ADJ

Rohs Compliant
NO

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© 1999 National Semiconductor Corporation
5-Lead TO-220 Bent, Staggered Leads
5-Lead TO-263
5-Lead TO-263 Tape and Reel
LM2585
SIMPLE SWITCHER
General Description
The LM2585 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 adjust-
able.
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 regula-
tors. Also listed are selector guides for diodes and capacitors
and a family of standard inductors and flyback transformers
designed to work with these switching regulators.
The power switch is a 3.0A 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, cur-
rent mode control for improved rejection of input voltage and
output load transients and cycle-by-cycle current limiting. An
output voltage tolerance of
ages and output load conditions, is guaranteed for the power
supply system.
Flyback Regulator
Ordering Information
SIMPLE SWITCHER and Switchers Made Simple
Package Type
±
4%, within specified input volt-
are registered trademarks of National Semiconductor Corporation.
DS012515
®
NSC Package
3A Flyback Regulator
Drawing
TS5B
TS5B
T05D
LM2585T-3.3, LM2585T-5.0, LM2585T-12, LM2585T-ADJ
LM2585S-3.3, LM2585S-5.0, LM2585S-12, LM2585S-ADJ
LM2585SX-3.3, LM2585SX-5.0, LM2585SX-12,
LM2585SX-ADJ
Features
n Requires few external components
n Family of standard inductors and transformers
n NPN output switches 3.0A, 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
DS012515-1
±
4% max over line
www.national.com
March 1998

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