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LM2585 Datasheet

3-A Step-Up Wide Vin Flyback Converter

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LM2585
SNVS120G – APRIL 2000 – REVISED MAY 2019
LM2585 4-V to 40-V, 3-A Step-Up Wide VIN Flyback Converter
1 Features
1 Requires Few External Components
• Family of Standard Inductors and Transformers
• NPN Output Switches 3 A, Can Stand Off 65 V
• Wide Input Voltage Range: 4 V to 40 V
• Current-mode Operation for Improved Transient
Response, Line Regulation, and Current Limit
• 100-kHz Switching Frequency
• Internal Soft-Start Function Reduces In-rush
Current During Start-up
• Output Transistor Protected by Current Limit,
Undervoltage Lockout, and Thermal Shutdown
• System Output Voltage Tolerance of ±4%
Maximum Over Line and Load Conditions
• Create a Custom Design Using the LM2585 With
the WEBENCH® Power Designer
2 Applications
• Flyback Regulator
• Multiple-output Regulator
• Simple Boost Regulator
• Forward Converter
3 Description
The LM2585 series of regulators are monolithic
integrated circuits specifically designed for flyback,
step-up (boost), and forward converter applications.
The device is available in 4 different output voltage
versions: 3.3 V, 5 V, 12 V, and adjustable.
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.
The power switch is a 3-A NPN device that can stand
off 65 V. Protecting the power switch are current and
thermal limiting circuits, and an undervoltage lockout
circuit. This IC contains a 100-kHz fixed-frequency
internal oscillator that permits the use of small
magnetics. Other features include soft start mode to
reduce in-rush current during start-up, current mode
control for improved rejection of input voltage and
output load transients and cycle-by-cycle current
limiting. An output voltage tolerance of ±4%, within
specified input voltages and output load conditions, is
specified for the power supply system.
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE (NOM)
LM2585
DDPAK/ TO-263 (5) 10.16 mm × 8.42 mm
TO-220 (5)
14.986 mm × 10.16 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
12-V Flyback Regulator Design Example
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




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LM2585 Datasheet Preview

LM2585 Datasheet

3-A Step-Up Wide Vin Flyback Converter

No Preview Available !

LM2585
SNVS120G – APRIL 2000 – REVISED MAY 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configurations................................................. 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ..................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Ratings............................ 4
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics: 3.3 V ............................... 5
6.6 Electrical Characteristics: 5 V .................................. 6
6.7 Electrical Characteristics: 12-V ................................ 6
6.8 Electrical Characteristics: Adjustable ........................ 7
6.9 Electrical Characteristics: All Versions ..................... 8
6.10 Typical Characteristics ............................................ 9
7 Detailed Description ............................................ 11
7.1 Overview ................................................................. 11
7.2 Functional Block Diagram ....................................... 13
7.3 Feature Description................................................. 13
8 Application and Implementation ........................ 15
8.1 Application Information............................................ 15
8.2 Typical Applications ................................................ 15
8.3 Additional Application Examples............................. 27
9 Layout ................................................................... 29
9.1 Layout Guidelines ................................................... 29
9.2 Heat Sink/Thermal Considerations ......................... 29
10 Device and Documentation Support ................. 31
10.1 Device Support...................................................... 31
10.2 Receiving Notification of Documentation Updates 31
10.3 Community Resources.......................................... 31
10.4 Trademarks ........................................................... 31
10.5 Electrostatic Discharge Caution ............................ 31
10.6 Glossary ................................................................ 32
11 Mechanical, Packaging, and Orderable
Information ........................................................... 32
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision F (April 2013) to Revision G
Page
• Editorial changes only, no technical revisions; add links for WEBENCH .............................................................................. 1
Changes from Revision E (April 2013) to Revision F
Page
• Changed layout of National Semiconductor data sheet to TI format.................................................................................... 30
2 Submit Documentation Feedback
Product Folder Links: LM2585
Copyright © 2000–2019, Texas Instruments Incorporated


Part Number LM2585
Description 3-A Step-Up Wide Vin Flyback Converter
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