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LM2587

www.ti.com

SNVS115D –APRIL 2000–REVISED APRIL 2013

LM2587 SIMPLE SWITCHER

5A Flyback Regulator

Check for Samples: LM2587

FEATURES

DESCRIPTION

The LM2587 series of regulators are monolithic

• Requires Few External Components

integrated circuits specifically designed for flyback,

• Family of Standard Inductors and

step-up (boost), and forward converter applications.

Transformers

The device is available in 4 different output voltage

• NPN Output Switches 5.0A, can Stand Off 65V

versions: 3.3V, 5.0V, 12V, and adjustable.

• Wide Input Voltage Range: 4V to 40V

Requiring a minimum number of external

components, these regulators are cost effective, and

• Current-Mode Operation for Improved

simple to use. Included in the datasheet are typical

Transient Response, Line Regulation, and

circuits of boost and flyback regulators. Also listed

Current Limit

are selector guides for diodes and capacitors and a

• 100 kHz Switching Frequency

family of standard inductors and flyback transformers

• Internal Soft-Start Function Reduces In-Rush

designed to work with these switching regulators.

Current During Start-Up

The power switch is a 5.0A NPN device that can

• Output Transistor Protected by Current Limit,

stand-off 65V. Protecting the power switch are current

Under Voltage Lockout, and Thermal

and thermal limiting circuits, and an undervoltage

Shutdown

lockout circuit. This IC contains a 100 kHz fixed-

frequency internal oscillator that permits the use of

• System Output Voltage Tolerance of ±4% Max

small magnetics. Other features include soft start

Over Line and Load Conditions

mode to reduce in-rush current during start up,

current mode control for improved rejection of input

TYPICAL APPLICATIONS

voltage and output load transients and cycle-by-cycle

• Flyback Regulator

current limiting. An output voltage tolerance of ±4%,

within specified input voltages and output load

• Multiple-Output Regulator

conditions, is ensured for the power supply system.

• Simple Boost Regulator

• Forward Converter

Flyback Regulator

Figure 1.

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.

2SIMPLE SWITCHER, Switchers Made Simple are registered trademarks of Texas Instruments.

3All 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.

Summary of content (32 pages)

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LM2587 www.ti.com SNVS115D – APRIL 2000 – REVISED APRIL 2013 LM2587 SIMPLE SWITCHER® 5A Flyback Regulator Check for Samples: LM2587 FEATURES DESCRIPTION • • The LM2587 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 adjustable.
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LM2587 SNVS115D – APRIL 2000 – REVISED APRIL 2013 www.ti.com Connection Diagrams Figure 2. Bent, Staggered Leads 5-Lead TO-220 (NDH) Top View Figure 3. Bent, Staggered Leads 5-Lead TO-220 (NDH) Side View Figure 4. 5-Lead TO-263 (KTT) Top View Figure 5. 5-Lead TO-263 (KTT) Side View For Fixed Versions 3.3V, R1 = 3.4k, R2 = 2k5V, R1 = 6.15k, R2 = 2k12V, R1 = 8.73k, R2 = 1kFor Adj. VersionR1 = Short (0Ω), R2 = Open Figure 6.
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LM2587 www.ti.com SNVS115D – APRIL 2000 – REVISED APRIL 2013 Test Circuits CIN1—100 μF, 25V Aluminum Electrolytic CIN2—0.1 μF CeramicT—22 μH, 1:1 Schott #67141450D—1N5820COUT—680 μF, 16V Aluminum Electrolytic CC—0.47 μF Ceramic RC—2k Figure 7. LM2587-3.3 and LM2587-5.0 Test Circuit CIN1—100 μF, 25V Aluminum Electrolytic CIN2—0.1 μF CeramicL—15 μH, Renco #RL-5472-5D—1N5820COUT—680 μF, 16V Aluminum Electrolytic CC—0.
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LM2587 SNVS115D – APRIL 2000 – REVISED APRIL 2013 www.ti.com As shown in Figure 9, the LM2587 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 22. Typical Performance Characteristics observed during the operation of this circuit are shown in Figure 23. Figure 9. 12V Flyback Regulator Design Example These devices have limited built-in ESD protection.
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LM2587 www.ti.com SNVS115D – APRIL 2000 – REVISED APRIL 2013 Absolute Maximum Ratings (1) (2) −0.4V ≤ VIN ≤ 45V Input Voltage −0.4V ≤ VSW ≤ 65V Switch Voltage Switch Current (3) Internally Limited Compensation Pin Voltage −0.4V ≤ VCOMP ≤ 2.4V Feedback Pin Voltage −0.4V ≤ VFB ≤ 2 VOUT −65°C to +150°C Storage Temperature Range Lead Temperature (Soldering, 10 sec.
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LM2587 SNVS115D – APRIL 2000 – REVISED APRIL 2013 www.ti.com LM2587-5.0 Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V. Symbol Parameters Conditions Typical Min Max Units 4.80/4.75 5.20/5.25 V SYSTEM PARAMETERS Test Circuit of Figure 7 (1) VOUT Output Voltage VIN = 4V to 12V ILOAD = 500 mA to 1.45A 5.
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LM2587 www.ti.com SNVS115D – APRIL 2000 – REVISED APRIL 2013 LM2587-ADJ Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V. Symbol Parameters Conditions Typical Min Max Units 12.0 11.52/11.40 12.48/12.60 V SYSTEM PARAMETERS Test Circuit of Figure 8 (1) VOUT Output Voltage VIN = 4V to 10V ILOAD = 300 mA to 1.
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LM2587 SNVS115D – APRIL 2000 – REVISED APRIL 2013 www.ti.com All Output Voltage Versions Electrical Characteristics(1) (continued) Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V. Symbol Parameters Conditions Typical Min Max Units 11.0 8.0/7.0 17.0/19.
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LM2587 www.ti.com SNVS115D – APRIL 2000 – REVISED APRIL 2013 Typical Performance Characteristics Supply Current vs Temperature Reference Voltage vs Temperature Figure 10. Figure 11. ΔReference Voltage vs Supply Voltage Supply Current vs Switch Current Figure 12. Figure 13. Current Limit vs Temperature Feedback Pin Bias Current vs Temperature Figure 14. Figure 15.
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LM2587 SNVS115D – APRIL 2000 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 10 Switch Saturation Voltage vs Temperature Switch Transconductance vs Temperature Figure 16. Figure 17. Oscillator Frequency vs Temperature Error Amp Transconductance vs Temperature Figure 18. Figure 19. Error Amp Voltage Gain vs Temperature Short Circuit Frequency vs Temperature Figure 20. Figure 21.
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LM2587 www.ti.com SNVS115D – APRIL 2000 – REVISED APRIL 2013 Performance Characteristics A: Switch Voltage, 10 V/divB: Switch Current, 5 A/divC: Output Rectifier Current, 5 A/divD: Output Ripple Voltage, 100 mV/div AC-Coupled Horizontal: 2 μs/div Figure 22. Switching Waveforms Figure 23.
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LM2587 SNVS115D – APRIL 2000 – REVISED APRIL 2013 www.ti.com TYPICAL FLYBACK REGULATOR APPLICATIONS Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 show six typical flyback applications, varying from single output to triple output. Each drawing contains the part number(s) and manufacturer(s) for every component except the transformer. For the transformer part numbers and manufacturers names, see the table in TRANSFORMER SELECTION (T).
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LM2587 www.ti.com SNVS115D – APRIL 2000 – REVISED APRIL 2013 Figure 25. Single-Output Flyback Regulator Figure 26.
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LM2587 SNVS115D – APRIL 2000 – REVISED APRIL 2013 www.ti.com Figure 27. Dual-Output Flyback Regulator Figure 28.
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LM2587 www.ti.com SNVS115D – APRIL 2000 – REVISED APRIL 2013 Figure 29. Triple-Output Flyback Regulator TRANSFORMER SELECTION (T) Table 1 lists the standard transformers available for flyback regulator applications. Included in the table are the turns ratio(s) for each transformer, as well as the output voltages, input voltage ranges, and the maximum load currents for each circuit. Table 1.
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LM2587 SNVS115D – APRIL 2000 – REVISED APRIL 2013 www.ti.com Table 2.
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LM2587 www.ti.com SNVS115D – APRIL 2000 – REVISED APRIL 2013 T3 T4 Figure 38. Pulse PE-68421 (Surface Mount) (Top View) Figure 39. Pulse PE-68422 (Surface Mount) (Top View) T1 T2 Figure 40. Renco RL-5530 (Top View) Figure 41. Renco RL-5531 (Top View) T3 T4 Figure 42. Renco RL-5534 (Top View) Figure 43. Renco RL-5535 (Top View) T1 T2 Figure 44. Schott 67141450 (Top View) Figure 45. Schott 67140860 (Top View) T3 T4 Figure 46. Schott 67140920 (Top View) Figure 47.
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LM2587 SNVS115D – APRIL 2000 – REVISED APRIL 2013 www.ti.com A brief explanation of how the LM2587 Boost Regulator works is as follows (refer to Figure 48). When the NPN switch turns on, the inductor current ramps up at the rate of VIN/L, storing energy in the inductor. When the switch turns off, the lower end of the inductor flies above VIN, discharging its current through diode (D) into the output capacitor (COUT) at a rate of (VOUT − VIN)/L.
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LM2587 www.ti.com SNVS115D – APRIL 2000 – REVISED APRIL 2013 Figure 51. +5V to +12V Boost Regulator Table 3 contains a table of standard inductors, by part number and corresponding manufacturer, for the fixed output regulator of Figure 51. Table 3. Inductor Selection Table Coilcraft (1) Pulse R4793-A (1) (2) (3) (4) (2) PE-53900 Renco (3) Schott (4) RL-5472-5 67146520 Coilcraft Inc.,: Phone: (800) 322-26451102 Silver Lake Road, Cary, IL 60013: Fax: (708) 639-1469 Pulse Engineering Inc.
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LM2587 SNVS115D – APRIL 2000 – REVISED APRIL 2013 www.ti.com *The LM2587 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 heat sink needed, see the “Heat Sink/Thermal Considerations” section in Application Hints. Figure 54. +24V to +48V Boost Regulator Application Hints Figure 55.
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LM2587 www.ti.com SNVS115D – APRIL 2000 – REVISED APRIL 2013 FLYBACK REGULATOR INPUT CAPACITORS A flyback regulator draws discontinuous pulses of current from the input supply. Therefore, there are two input capacitors needed in a flyback regulator; one for energy storage and one for filtering (see Figure 56). Both are required due to the inherent operation of a flyback regulator. To keep a stable or constant voltage supply to the LM2587, a storage capacitor (≥100 μF) is required.
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LM2587 SNVS115D – APRIL 2000 – REVISED APRIL 2013 www.ti.com The other method to reduce or eliminate the “ringing” is to insert a Schottky diode clamp between pins 4 and 3 (ground), also shown in Figure 56. This prevents the voltage at pin 4 from dropping below −0.4V. The reverse voltage rating of the diode must be greater than the switch off voltage. Figure 57. Input Line Filter OUTPUT VOLTAGE LIMITATIONS The maximum output voltage of a boost regulator is the maximum switch voltage minus a diode drop.
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LM2587 www.ti.com SNVS115D – APRIL 2000 – REVISED APRIL 2013 Figure 58. Circuit Board Layout CIRCUIT LAYOUT GUIDELINES As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring inductance generate voltage transients which can cause problems. For minimal inductance and ground loops, keep the length of the leads and traces as short as possible. Use single point grounding or ground plane construction for best results.
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LM2587 SNVS115D – APRIL 2000 – REVISED APRIL 2013 www.ti.com (8) where VF is the forward biased voltage of the diode and is typically 0.5V for Schottky diodes and 0.8V for fast recovery diodes. VSAT is the switch saturation voltage and can be found in the Characteristic Curves. When no heat sink is used, the junction temperature rise is: ΔTJ = PD × θJA. (9) Adding the junction temperature rise to the maximum ambient temperature gives the actual operating junction temperature: TJ = ΔTJ + TA.
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LM2587 www.ti.com SNVS115D – APRIL 2000 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision C (April 2013) to Revision D • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM2587S-12/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2587S -12 P+ LM2587S-3.3/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2587S -3.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LM2587SX-12/NOPB DDPAK/ TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM2587SX-5.0/NOPB DDPAK/ TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM2587SX-ADJ DDPAK/ TO-263 KTT 5 500 330.0 24.4 10.75 14.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2587SX-12/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2587SX-5.0/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2587SX-ADJ DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2587SX-ADJ/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.
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MECHANICAL DATA NDH0005D www.ti.
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MECHANICAL DATA KTT0005B TS5B (Rev D) BOTTOM SIDE OF PACKAGE www.ti.
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