LM5000

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SNVS176D – MAY 2004 – REVISED MARCH 2007

LM5000 High Voltage Switch Mode Regulator

Check for Samples: LM5000

1

FEATURES

DESCRIPTION

The

LM5000

is

a

monolithic

integrated

circuit

2

•

80V Internal Switch

specifically designed and optimized for flyback, boost

•

Operating Input Voltage Range of 3.1V to 40V

or forward power converter applications. The internal

•

Pin Selectable Operating Frequency

power switch is rated for a maximum of 80V, with a

current limit set to 2A. Protecting the power switch

–

300kHz/700kHz (-3)

are current limit and thermal shutdown circuits. The

–

600kHz/1.3MHz (-6)

current mode control scheme provides excellent

•

Adjustable Output Voltage

rejection of line transients and cycle-by-cycle current

limiting. An external compensation pin and the built-in

•

External Compensation

slope compensation allow the user to optimize the

•

Input Undervoltage Lockout

frequency compensation. Other distinctive features

•

Softstart

include softstart to reduce stresses during start-up

and an external shutdown pin for remote ON/OFF

•

Current Limit

control. There are two operating frequency ranges

•

Over Temperature Protection

available. The LM5000-3 is pin selectable for either

•

External Shutdown

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

•

Small 16-Lead TSSOP or 16-Lead WSON

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

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

Package

available in a low profile 16-lead TSSOP package or

a thermally enhanced 16-lead WSON package.

APPLICATIONS

•

Flyback Regulator

•

Forward Regulator

•

Boost Regulator

•

DSL Modems

•

Distributed Power Converters

Typical Application Circuit

Figure 1. LM5000 Flyback Converter

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004–2007, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.