Flyback Regulator. LM2588 Datasheet

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LM2588 Datasheet
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Part LM2588
Description 5-A Flyback Regulator
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LM2588
SNVS117E – APRIL 1998 – REVISED JUNE 2019
LM2588 5-A Flyback Regulator With Shutdown
1 Features
1 Requires Few External Components
• Family of Standard Inductors and Transformers
• NPN Output Switches 5 A, Can Stand Off 65 V
• Wide Input Voltage Range: 4 V to 40 V
• Adjustable Switching Frequency: 100 kHz to 200
kHz
• 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
• 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% Max
Over Line and Load Conditions
• Create a Custom Design Using the LM2588With
the WEBENCH® Power Designer
2 Typical Applications
• Flyback Regulator
• Forward Converter
• Multiple-output Regulator
• Simple Boost Regulator
3 Description
The LM2588 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 this data sheet 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 5-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 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.
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.
PART NUMBER
LM2588
Device Information(1)
PACKAGE
BODY SIZE (NOM)
TO-220 (7)
10.1 mm × 8.89 mm
DDPAK /TO-263 (7) 14.986 mm × 10.16 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Flyback Regulator
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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LM2588
SNVS117E – APRIL 1998 – REVISED JUNE 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Typical 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 Electrical Characteristics: 3.3 V ................................ 5
6.5 Electrical Characteristics: 5 V ................................... 5
6.6 Electrical Characteristics: 12 V ................................. 6
6.7 Electrical Characteristics: Adjustable ........................ 6
6.8 Electrical Characteristics: All Output Voltage Versions
................................................................................... 7
6.9 Typical Characteristics .............................................. 9
7 Detailed Description ............................................ 12
7.1 Overview ................................................................. 12
7.2 Functional Block Diagram ....................................... 12
7.3 Feature Description................................................. 12
8 Application and Implementation ........................ 18
8.1 Application Information............................................ 18
8.2 Typical Applications ............................................... 18
8.3 System Examples ................................................... 28
9 Layout ................................................................... 29
9.1 Layout Guidelines ................................................... 29
9.2 Layout Example ...................................................... 29
9.3 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 ............................ 32
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 D (April 2013) to Revision E
Page
• Editorial changes only; no technical revisions ....................................................................................................................... 1
• Added links for WEBENCH ................................................................................................................................................... 1
Changes from Revision C (April 2013) to Revision D
Page
• Changed layout of National Semiconductor data sheet to TI format .................................................................................... 1
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Product Folder Links: LM2588
Copyright © 1998–2019, Texas Instruments Incorporated



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5 Pin Configurations
LM2588
SNVS117E – APRIL 1998 – REVISED JUNE 2019
NDZ Package
7-Pin TO-220
Top View, Bent, Staggered Leads
KTW Package
7-Pin DDPAK/TO-263
Top View
NDZ Package
7-Pin TO-220
Side View; Bent, Staggered Leads
KTW Package
7-Pin DDPAK/TO-263
Side View
Copyright © 1998–2019, Texas Instruments Incorporated
Product Folder Links: LM2588
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