LM5000EP

Enhanced Plastic High Voltage Switch Mode Regulator

General Description

The LM5000EP is a monolithic integrated circuit specifically

designed and optimized for flyback, boost or forward power

converter applications. The internal power switch is rated for

a maximum of 80V, with a current limit set to 2A. Protecting

the power switch are current limit and thermal shutdown

circuits. The current mode control scheme provides excellent

rejection of line transients and cycle-by-cycle current limiting.

An external compensation pin and the built-in slope compen-

sation allow the user to optimize the frequency compensa-

tion. Other distinctive features include softstart to reduce

stresses during start-up and an external shutdown pin for

remote ON/OFF control. There are two operating frequency

ranges available. The LM5000-3EP is pin selectable for

either 300kHz (FS Grounded) or 700kHz (FS Open). The

LM5000-6EP is pin selectable for either 600kHz (FS

Grounded) or 1.3MHz (FS Open). The device is available in

a low profile 16-lead TSSOP package or a thermally en-

hanced 16-lead LLP package.

ENHANCED PLASTIC

•

Extended Temperature Performance of −40˚C to +125˚C

•

Baseline Control - Single Fab & Assembly Site

•

Process Change Notification (PCN)

•

Qualification & Reliability Data

•

Solder (PbSn) Lead Finish is standard

•

Enhanced Diminishing Manufacturing Sources (DMS)

Support

Features

n

80V internal switch

n

Operating input voltage range of 3.1V to 40V

n

Pin selectable operating frequency

300kHz/700kHz (-3)

600kHz/1.3MHz (-6)

n

Adjustable output voltage

n

External compensation

n

Input undervoltage lockout

n

Softstart

n

Current limit

n

Over temperature protection

n

External shutdown

n

Small 16-Lead TSSOP or 16-Lead LLP package

Applications

n

Flyback Regulator

n

Forward Regulator

n

Boost Regulator

n

Distributed Power Converters

n

Selected Military Applications

n

Selected Avionics Applications

Ordering Information

PART NUMBER

VID PART NUMBER

NS PACKAGE NUMBER (Note 3)

LM5000-3MTCEP

V62/04632-01

MTC16

(Notes 1, 2)

TBD

TBD

Note 1: For the following (Enhanced Plastic) version, check for availability: LM5000-3MTCXEP, LM5000SD-3EP, LM5000SD-6EP, LM5000SDX-3EP,

LM5000SDX-6EP. Parts listed with an "X" are provided in Tape & Reel and parts without an "X" are in Rails.

Note 2: FOR ADDITIONAL ORDERING AND PRODUCT INFORMATION, PLEASE VISIT THE ENHANCED PLASTIC WEB SITE AT: www.national.com/

mil

Note 3: Refer to package details under Physical Dimensions

May 2004

© 2004 National Semiconductor Corporation

DS200983

www.national.com