lm2588sx-adj National Semiconductor Corporation, lm2588sx-adj Datasheet



Manufacturer Part Number
Simple Switcher 5a Flyback Regulator With
National Semiconductor Corporation
© 2005 National Semiconductor Corporation
General Description
The LM2588 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-
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 an adjustable frequency oscillator that can be pro-
grammed up to 200 kHz. The oscillator can also be synchro-
nized with other devices, so that multiple devices can oper-
ate at the same switching frequency.
Other features include soft start mode to reduce in-rush
current during start up, and current mode control for im-
proved rejection of input voltage and output load transients
and cycle-by-cycle current limiting. The device also has a
shutdown pin, so that it can be turned off externally. An
output voltage tolerance of
ages and output load conditions, is guaranteed for the power
supply system.
Connection Diagrams
and Switchers Made Simple
Bent, Staggered Leads
7-Lead TO-220 (T)
Top View
4%, within specified input volt-
are registered trademarks of National Semiconductor Corporation.
Order Number LM2588T-3.3, LM2588T-5.0,
See NS Package Number TA07B
LM2588T-12 or LM2588T-ADJ
5A Flyback Regulator with
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 Adjustable switching frequency: 100 kHz to 200 kHz
n External shutdown capability
n Draws less than 60 µA when shut down
n Frequency synchronization
n Current-mode operation for improved transient
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 Forward converter
n Multiple-output regulator
n Simple boost regulator
response, line regulation, and current limit
voltage lockout, and thermal shutdown
and load conditions
Bent, Staggered Leads
7-Lead TO-220 (T)
Side View
4% max over line
July 2005

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