1FEATURES

2• 80V Internal Switch

• Operating Input Voltage Range of 3.1V to 40V

• Pin Selectable Operating Frequency

– 300kHz/700kHz (-3)

– 600kHz/1.3MHz (-6)

• Adjustable Output Voltage

• External Compensation

• Input Undervoltage Lockout

• Softstart

• Current Limit

• Over Temperature Protection

• External Shutdown

• Small 16-Lead TSSOP or 16-Lead WSON

Package

APPLICATIONS

• Flyback Regulator

• Forward Regulator

• Boost Regulator

• DSL Modems

• Distributed Power Converters

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 WSON package.