LM5000_15 Datasheet, PDF (1/24 Pages) Texas Instruments – High Voltage Switch Mode Regulator

LM5000
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SNVS176D – MAY 2004 – REVISED MARCH 2007
LM5000 High Voltage Switch Mode Regulator
Check for Samples: LM5000
FEATURES
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•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.
Typical Application Circuit
Figure 1. LM5000 Flyback Converter
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2007, Texas Instruments Incorporated