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.