LM2588S-3.3 National Semiconductor, LM2588S-3.3 Datasheet

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LM2588S-3.3

Manufacturer Part Number
LM2588S-3.3
Description
SIMPLE SWITCHER 5A Flyback Regulator with
Manufacturer
National Semiconductor
Datasheet

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LM2588S-3.3
Manufacturer:
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© 1999 National Semiconductor Corporation
LM2588
SIMPLE SWITCHER
Shutdown
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 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 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 cur-
rent during start up, and current mode control for improved
rejection of input voltage and output load transients and
cycle-by-cycle current limiting. The device also has a shut-
down pin, so that it can be turned off externally. An output
voltage tolerance of
output load conditions, is guaranteed for the power supply
system.
Flyback Regulator
SIMPLE SWITCHER
®
and Switchers Made Simple
±
4%, within specified input voltages and
®
are registered trademarks of National Semiconductor Corporation.
DS012420
®
5A Flyback Regulator with
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 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
start-up
voltage lockout, and thermal shutdown
and load conditions
DS012420-1
±
4% max over line
www.national.com
April 1998

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