LM2587SX-3.3 National Semiconductor, LM2587SX-3.3 Datasheet

LM2587SX-3.3

Manufacturer Part Number

LM2587SX-3.3

Description

SIMPLE SWITCHER 5A Flyback Regulator

Manufacturer

National Semiconductor

Datasheet

1.LM2587SX-3.3.pdf (26 pages)

Current page: 1 of 26
Download datasheet (677Kb)

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 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 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

5-Lead TO-220 Bent, Staggered Leads

5-Lead TO-263

5-Lead TO-263 Tape and Reel

SIMPLE SWITCHER

Package Type

and Switchers Made Simple

4%, within specified input volt-

are registered trademarks of National Semiconductor Corporation.

DS012316

NSC Package

5A Flyback Regulator

Drawing

T05D

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

DS012316-1

4% max over line

www.national.com

April 1998

Related parts for LM2587SX-3.3

Related keywords

LM2587SX-3.3 datasheet
LM2587SX-3.3 data sheet
LM2587SX-3.3 pdf datasheet
LM2587SX-3.3 component
LM2587SX-3.3 part
LM2587SX-3.3 distributor
LM2587SX-3.3 RoHS
LM2587SX-3.3 datasheet download