LM2586
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SNVS121D –MAY 1996–REVISED APRIL 2013
®
LM2586 SIMPLE SWITCHER 3A Flyback Regulator with Shutdown
Check for Samples: LM2586
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FEATURES
DESCRIPTION
The LM2586 series of regulators are monolithic
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Requires Few External Components
integrated circuits specifically designed for flyback,
step-up (boost), and forward converter applications.
The device is available in 4 different output voltage
versions: 3.3V, 5.0V, 12V, and adjustable.
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Family of Standard Inductors and
Transformers
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NPN Output Switches 3.0A, Can Stand Off 65V
Wide Input Voltage Range: 4V to 40V
Requiring
a
minimum number of external
components, these regulators are cost effective, and
simple to use. Included in the datasheet are typical
circuits of boost and flyback regulators. Also listed
are selector guides for diodes and capacitors and a
family of standard inductors and flyback transformers
designed to work with these switching regulators.
Adjustable Switching Frequency: 100 kHz to
200 kHz
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External Shutdown Capability
Draws Less Than 60 μA When Shut Down
Frequency Synchronization
Current-mode Operation for Improved
Transient Response, Line Regulation, and
Current Limit
The power switch is a 3.0A NPN device that can
stand-off 65V. Protecting the power switch are current
and thermal limiting circuits, and an undervoltage
lockout circuit. This IC contains an adjustable
frequency oscillator that can be programmed up to
200 kHz. The oscillator can also be synchronized with
other devices, so that multiple devices can operate at
the same switching frequency.
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Internal Soft-start Function Reduces In-rush
Current During Start-up
Output Transistor Protected by Current Limit,
Under Voltage Lockout, and Thermal
Shutdown
Other features include soft start mode to reduce in-
rush current during start up, and current mode control
for improved rejection of input voltage and output
load transients and cycle-by-cycle current limiting.
The device also has a shutdown pin, so that it can be
turned off externally. An output voltage tolerance of
±4%, within specified input voltages and output load
conditions, is ensured for the power supply system.
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System Output Voltage Tolerance of ±4% Max
Over Line and Load Conditions
TYPICAL APPLICATIONS
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Flyback Regulator
Forward Converter
Multiple-output Regulator
Simple Boost Regulator
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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SIMPLE SWITCHER is a registered trademark of Texas Instruments.
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All other trademarks are the property of their respective owners.
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 © 1996–2013, Texas Instruments Incorporated