LM5000

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SNVS176D – MAY 2004 – REVISED MARCH 2007

LM5000 High Voltage Switch Mode Regulator

Check for Samples: LM5000

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FEATURES

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Over temperature protection

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External shutdown

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80V internal switch

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Small 16-Lead TSSOP or 16-Lead LLP package

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Operating input voltage range of 3.1V to 40V

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Pin selectable operating frequency

APPLICATIONS

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300kHz/700kHz (-3)

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Flyback Regulator

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600kHz/1.3MHz (-6)

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Forward Regulator

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Adjustable output voltage

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Boost Regulator

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External compensation

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DSL Modems

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Input undervoltage lockout

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Distributed Power Converters

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Softstart

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Current limit

DESCRIPTION

The LM5000 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 compensation allow the user to optimize the frequency compensation.

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 LM5000-3 is pin selectable for

either 300kHz (FS Grounded) or 700kHz (FS Open). The LM5000-6 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

enhanced 16-lead LLP package.

Typical Application Circuit

Figure 1. LM5000 Flyback Converter

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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.