LM2588SX-ADJ/NOPB

Manufacturer Part NumberLM2588SX-ADJ/NOPB
DescriptionIC MULTI CONFIG SYNC ADJ TO263-7
ManufacturerNational Semiconductor
SeriesSIMPLE SWITCHER®
TypeStep-Up (Boost), Flyback, Forward Converter
LM2588SX-ADJ/NOPB datasheet
 


Specifications of LM2588SX-ADJ/NOPB

Internal Switch(s)YesSynchronous RectifierNo
Number Of Outputs1Voltage - OutputAdjustable
Current - Output5AFrequency - Switching100kHz ~ 200kHz
Voltage - Input4 ~ 40 VOperating Temperature-40°C ~ 125°C
Mounting TypeSurface MountPackage / CaseD²Pak, TO-263 (7 leads + tab)
Primary Input Voltage40VNo. Of Outputs1
Output Voltage37VOutput Current5A
No. Of Pins7Operating Temperature Range-40°C To +125°C
MslMSL 3 - 168 HoursFilter TerminalsSMD
Rohs CompliantYesFor Use With551011367-051 - BOARD WEBENCH BUILD IT LM2586/88
Lead Free Status / RoHS StatusLead free / RoHS CompliantPower - Output-
Other names*LM2588SX-ADJ
*LM2588SX-ADJ/NOPB
LM2588SX-ADJ
  
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LM2588
SIMPLE SWITCHER
Shutdown
General 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: 3.3V, 5.0V, 12V, and ad-
justable.
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 regu-
lators. Also listed are selector guides for diodes and capaci-
tors and a family of standard inductors and flyback trans-
formers designed to work with these switching regulators.
The power switch is a 5.0A 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 pro-
grammed up to 200 kHz. The oscillator can also be synchro-
nized with other devices, so that multiple devices can oper-
ate at the same switching frequency.
Other features include soft start mode to reduce in-rush
current during start up, and current mode control for im-
proved 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 volt-
ages and output load conditions, is guaranteed for the power
supply system.
Connection Diagrams
Bent, Staggered Leads
7-Lead TO-220 (T)
Top View
SIMPLE SWITCHER
®
and Switchers Made Simple
®
are registered trademarks of National Semiconductor Corporation.
© 2005 National Semiconductor Corporation
5A Flyback Regulator with
®
Features
n Requires few external components
n Family of standard inductors and transformers
n NPN output switches 5.0A, can stand off 65V
n Wide input voltage range: 4V to 40V
n Adjustable switching frequency: 100 kHz to 200 kHz
n External shutdown capability
n Draws less than 60 µA when shut down
n Frequency synchronization
n Current-mode operation for improved transient
response, line regulation, and current limit
n Internal soft-start function reduces in-rush current during
start-up
n Output transistor protected by current limit, under
voltage lockout, and thermal shutdown
n System output voltage tolerance of
and load conditions
Typical Applications
n Flyback regulator
n Forward converter
n Multiple-output regulator
n Simple boost regulator
01242017
Order Number LM2588T-3.3, LM2588T-5.0,
LM2588T-12 or LM2588T-ADJ
See NS Package Number TA07B
DS012420
July 2005
±
4% max over line
Bent, Staggered Leads
7-Lead TO-220 (T)
Side View
01242018
www.national.com

LM2588SX-ADJ/NOPB Summary of contents

  • Page 1

    ... Bent, Staggered Leads 7-Lead TO-220 (T) Top View SIMPLE SWITCHER ® and Switchers Made Simple ® are registered trademarks of National Semiconductor Corporation. © 2005 National Semiconductor Corporation 5A Flyback Regulator with ® Features n Requires few external components n Family of standard inductors and transformers n NPN output switches 5.0A, can stand off 65V ...

  • Page 2

    ... TO-220 Bent, Staggered Leads 7-Lead TO-263 7-Lead TO-263 Tape and Reel www.national.com (Continued) 01242019 Order Number LM2588S-3.3, LM2588S-5.0, LM2588S-12 or LM2588S-ADJ Tape and Reel Order Number LM2588SX-3.3, LM2588SX-5.0, LM2588SX-12 or LM2588SX-ADJ See NS Package Number TS7B NSC Package Drawing TA07B LM2588T-3.3, LM2588T-5.0, LM2588T-12, LM2588T-ADJ TS7B LM2588S-3 ...

  • Page 3

    ... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage Switch Voltage Switch Current (Note 2) Compensation Pin Voltage Feedback Pin Voltage ON /OFF Pin Voltage Sync Pin Voltage Power Dissipation (Note 3) Storage Temperature Range LM2588-3 ...

  • Page 4

    LM2588-5.0 Electrical Characteristics Specifications with standard type face are for T Range. Unless otherwise specified, V Symbol Parameters V Output Reference Measured at Feedback Pin REF Voltage V ∆V Reference Voltage V REF Line Regulation G Error Amp I M ...

  • Page 5

    LM2588-ADJ Electrical Characteristics Specifications with standard type face are for T Range. Unless otherwise specified, V Symbol Parameters UNIQUE DEVICE PARAMETERS (Note 5) V Output Reference Measured at Feedback Pin REF Voltage V COMP ∆V Reference Voltage V REF IN ...

  • Page 6

    All Output Voltage Versions Electrical Characteristics Specifications with standard type face are for T Range. Unless otherwise specified, V Symbol Parameters I NPN Switch Current CL Limit V Synchronization F STH Threshold Voltage V I Synchronization V SYNC Pin Current ...

  • Page 7

    Typical Performance Characteristics Supply Current vs Temperature ∆Reference Voltage vs Supply Voltage Current Limit vs Temperature 01242002 01242004 01242006 7 Reference Voltage vs Temperature 01242003 Supply Current vs Switch Current 01242005 Feedback Pin Bias Current vs Temperature 01242007 www.national.com ...

  • Page 8

    Typical Performance Characteristics Switch Saturation Voltage vs Temperature Oscillator Frequency vs Temperature Error Amp Voltage Gain vs Temperature www.national.com (Continued) Switch Transconductance 01242008 Error Amp Transconductance 01242010 Short Circuit Frequency 01242012 8 vs Temperature 01242009 vs Temperature 01242011 vs Temperature ...

  • Page 9

    Typical Performance Characteristics Shutdown Supply Current vs Temperature Oscillator Frequency vs Resistance Flyback Regulator (Continued) 01242014 01242016 9 ON /OFF Pin Current vs Voltage 01242015 01242001 www.national.com ...

  • Page 10

    Test Circuits C — 100 µF, 25V Aluminum ElectrolyticC IN1 IN2 ElectrolyticC — 0.47 µF CeramicR — — 100 µF, 25V Aluminum ElectrolyticC IN1 IN2 ElectrolyticC — 0.47 µF CeramicR — 2kFor 12V Devices ...

  • Page 11

    Block Diagram For Fixed Versions 3.3V 3.4k 2k5.0V 6.15k 2k12V 8.73k 1kFor Adj. VersionR1 = Short (0Ω), R2 = Open Flyback Regulator Operation The LM2588 is ideally suited ...

  • Page 12

    Flyback Regulator Operation As shown in Figure 4, the LM2588 can be used as a flyback regulator by using a minimum number of external components. The switching waveforms of this regulator are shown in Figure 5. Typical Performance Characteristics observed ...

  • Page 13

    Typical Performance Characteristics FIGURE 6. V Typical Flyback Regulator Applications Figure 7 through 12 show six typical flyback applications, varying from single output to triple output. Each drawing contains the part number(s) and manufacturer(s) for every (Continued) Response to Load ...

  • Page 14

    Typical Flyback Regulator Applications www.national.com (Continued) FIGURE 8. Single-Output Flyback Regulator FIGURE 9. Single-Output Flyback Regulator 14 01242026 01242027 ...

  • Page 15

    Typical Flyback Regulator Applications (Continued) FIGURE 10. Dual-Output Flyback Regulator FIGURE 11. Dual-Output Flyback Regulator 15 01242028 01242029 www.national.com ...

  • Page 16

    Typical Flyback Regulator Applications TRANSFORMER SELECTION (T) Figure 13 lists the standard transformers available for fly- back regulator applications. Included in the table are the turns ratio(s) for each transformer, as well as the output voltages, input voltage ranges, and ...

  • Page 17

    Typical Flyback Regulator Applications Transformer Type Coilcraft (Note 16) T1 Q4434-B T2 Q4337-B T3 Q4343-B T4 Q4344-B Note 16: Coilcraft Inc.,: Phone: (800) 322-2645 1102 Silver Lake Road, Cary, IL 60013: Fax: (708) 639-1469 European Headquarters, 21 Napier Place: Phone: ...

  • Page 18

    Typical Flyback Regulator Applications (Continued) T1 Top View FIGURE 19. Coilcraft Q4435-B (Surface Mount) T2 Top View FIGURE 20. Coilcraft Q4436-B (Surface Mount) T1 Top View FIGURE 21. Pulse PE-68411 (Surface Mount) www.national.com 01242035 FIGURE 22. Pulse PE-68412 (Surface Mount) ...

  • Page 19

    Typical Flyback Regulator Applications (Continued) T1 Top View FIGURE 25. Renco RL-5530 T2 Top View FIGURE 26. Renco RL-5531 T3 Top View FIGURE 27. Renco RL-5534 T4 Top View FIGURE 28. Renco RL-5535 FIGURE 29. Schott 67141450 01242041 FIGURE 30. ...

  • Page 20

    Typical Flyback Regulator Applications Step-Up (Boost) Regulator Operation Figure 33 shows the LM2588 used as a step-up (boost) regulator. This is a switching regulator that produces an output voltage greater than the input supply voltage. A brief explanation of how ...

  • Page 21

    Typical Performance Characteristics A: Switch Voltage,10V/div B: Switch Current, 5A/div C: Inductor Current, 5A/div D: Output Ripple Voltage, 100 mV/div, AC-Coupled FIGURE 35. V Typical Boost Regulator Applications Figure 36 and 38 through 40 show four typical boost applications — ...

  • Page 22

    Typical Boost Regulator Applications Figure 37 contains a table of standard inductors, by part number and corresponding manufacturer, for the fixed out- put regulator of Figure 36. Coilcraft (Note 20) R4793-A Note 20: Coilcraft Inc.,: Phone: (800) 322-2645 1102 Silver ...

  • Page 23

    Typical Boost Regulator Applications (Continued) FIGURE 38. +12V to +24V Boost Regulator FIGURE 39. +24V to +36V Boost Regulator 23 01242051 01242052 www.national.com ...

  • Page 24

    Typical Boost Regulator Applications *The LM2588 will require a heat sink in these applications. The size of the heat sink will depend on the maximum ambient temperature. To calculate the thermal resistance of the IC and the size of the ...

  • Page 25

    Application Hints (Continued) FREQUENCY SYNCHRONIZATION Another feature of the LM2588 is the ability to synchronize the switching frequency to an external source, using the sync pin (pin 6). This feature allows the user to parallel multiple devices to deliver more ...

  • Page 26

    Application Hints (Continued) FLYBACK REGULATOR INPUT CAPACITORS A flyback regulator draws discontinuous pulses of current from the input supply. Therefore, there are two input capaci- tors needed in a flyback regulator — one for energy storage and one for filtering ...

  • Page 27

    Application Hints (Continued) FIGURE 47. Input Line Filter OUTPUT VOLTAGE LIMITATIONS The maximum output voltage of a boost regulator is the maximum switch voltage minus a diode drop flyback regulator, the maximum output voltage is determined by the ...

  • Page 28

    ... To further simplify the flyback regulator design procedure, National Semiconductor is making available computer de- sign software Switchers Made Simple. Software is available ⁄ National Semiconductor sales office in your area or the National (1-800-272-9959). is the output voltage, LOAD I is the sum of the LOAD ...

  • Page 29

    ... Physical Dimensions inches (millimeters) unless otherwise noted LM2588SX-5.0, LM2588SX-12 or LM2588SX-ADJ Order Number LM2588T-3.3, LM2588T-5.0, LM2588T-12 or LM2588T-ADJ NS Package Number TA07B Order Number LM2588S-3.3, LM2588S-5.0, LM2588S-12 or LM2588S-ADJ Tape and Reel Order Number LM2588SX-3.3, NS Package Number TS7B 29 www.national.com ...

  • Page 30

    ... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...