Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - DC/DC voltage regulator Boost, Flyback, Forward converter TO 220 7

LM2586

www.ti.com

SNVS121D –MAY 1996–REVISED APRIL 2013

LM2586 SIMPLE SWITCHER

3A Flyback Regulator with Shutdown

Check for Samples: LM2586

FEATURES

DESCRIPTION

The LM2586 series of regulators are monolithic

234

• 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 3.0A, 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

• Adjustable Switching Frequency: 100 kHz to

simple to use. Included in the datasheet are typical

200 kHz

circuits of boost and flyback regulators. Also listed

• External Shutdown Capability

are selector guides for diodes and capacitors and a

• Draws Less Than 60 μA When Shut Down

family of standard inductors and flyback transformers

designed to work with these switching regulators.

• Frequency Synchronization

• Current-mode Operation for Improved

The power switch is a 3.0A NPN device that can

Transient Response, Line Regulation, and

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

Current Limit and thermal limiting circuits, and an undervoltage

lockout circuit. This IC contains an adjustable

• Internal Soft-start Function Reduces In-rush

frequency oscillator that can be programmed up to

Current During Start-up

200 kHz. The oscillator can also be synchronized with

• Output Transistor Protected by Current Limit,

other devices, so that multiple devices can operate at

Under Voltage Lockout, and Thermal

the same switching frequency.

Shutdown

Other features include soft start mode to reduce in-

• System Output Voltage Tolerance of ±4% Max

rush current during start up, and current mode control

Over Line and Load Conditions

for improved rejection of input voltage and output

load transients and cycle-by-cycle current limiting.

TYPICAL APPLICATIONS

The device also has a shutdown pin, so that it can be

turned off externally. An output voltage tolerance of

• Flyback Regulator

±4%, within specified input voltages and output load

• Forward Converter

conditions, is ensured for the power supply system.

• Multiple-output Regulator

• Simple Boost Regulator

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 is a registered trademark of Texas Instruments.

3Switchers Made Simple, Simple Switcher are registered trademarks of dcl_owner.

4All 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 (38 pages)

PAGE 1
LM2586 www.ti.com SNVS121D – MAY 1996 – REVISED APRIL 2013 LM2586 SIMPLE SWITCHER® 3A Flyback Regulator with Shutdown Check for Samples: LM2586 FEATURES DESCRIPTION • Requires Few External Components • Family of Standard Inductors and Transformers • NPN Output Switches 3.
PAGE 2
LM2586 SNVS121D – MAY 1996 – REVISED APRIL 2013 www.ti.com Connection Diagrams Figure 1. Bent, Staggered Leads 7-Lead TO-220 (NDZ) Top View See Package Number NDZ0007B Figure 2. Bent, Staggered Leads 7-Lead TO-220 (NDZ) Side View Figure 3. 7-Lead DDPAK (KTW) Top View See Package Number KTW0007B Figure 4. 7-Lead DDPAK (KTW) Side View These devices have limited built-in ESD protection.
PAGE 3
LM2586 www.ti.com SNVS121D – MAY 1996 – REVISED APRIL 2013 Operating Ratings 4V ≤ VIN ≤ 40V Supply Voltage 0V ≤ VSW ≤ 60V Output Switch Voltage Output Switch Current ISW ≤ 3.0A Junction Temp. Range −40°C ≤ TJ ≤ +125°C Electrical Characteristics LM2586-3.3 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 3.17/3.14 3.43/3.
PAGE 4
LM2586 SNVS121D – MAY 1996 – REVISED APRIL 2013 www.ti.com LM2586-5.0 (continued) Symbol AVOL (3) Parameters Conditions Error Amp Voltage Gain VCOMP = 0.5V to 1.6V RCOMP = 1.0 MΩ (3) Typical Min 165 99/49 Max Units V/V A 1.0 MΩ resistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL. LM2586-12 Symbol Parameters Conditions SYSTEM PARAMETERS Test Circuit of Figure 21 Typical Min Max Units 12.0 11.52/11.40 12.48/12.
PAGE 5
LM2586 www.ti.com SNVS121D – MAY 1996 – REVISED APRIL 2013 LM2586-ADJ Symbol Parameters Conditions SYSTEM PARAMETERS Test Circuit of Figure 21 Typical Min Max Units 12.0 11.52/11.40 12.48/12.60 V (1) VOUT Output Voltage VIN = 4V to 10V ILOAD = 0.2A to 0.8A ΔVOUT/ ΔVIN Line Regulation VIN = 4V to 10V ILOAD = 0.2A 20 100/200 mV ΔVOUT/ ΔILOAD Load Regulation VIN = 10V ILOAD = 0.2A to 0.8A 20 100/200 mV η Efficiency VIN = 10V, ILOAD = 0.
PAGE 6
LM2586 SNVS121D – MAY 1996 – REVISED APRIL 2013 www.ti.com LM2586-ADJ (continued) Symbol Parameters Typical Min Max Units 4.0 3.0 7.0 A FSYNC = 200 kHz VCOMP = 1V, VIN = 5V 0.75 0.625/0.40 0.875/1.00 V Synchronization Pin Current VIN = 5V VCOMP = 1V, VSYNC = VSTH 100 200 μA VSHTH ON/OFF Pin (Pin 1) Threshold Voltage VCOMP = 1V 1.6 1.0/0.8 2.2/2.
PAGE 7
LM2586 www.ti.com SNVS121D – MAY 1996 – REVISED APRIL 2013 Typical Performance Characteristics Supply Current vs Temperature Reference Voltage vs Temperature Figure 5. Figure 6. ΔReference Voltage vs Supply Voltage Supply Current vs Switch Current Figure 7. Figure 8. Current Limit vs Temperature Feedback Pin Bias Current vs Temperature Figure 9. Figure 10.
PAGE 8
LM2586 SNVS121D – MAY 1996 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 8 Switch Saturation Voltage vs Temperature Switch Transconductance vs Temperature Figure 11. Figure 12. Oscillator Frequency vs Temperature Error Amp Transconductance vs Temperature Figure 13. Figure 14. Error Amp Voltage Gain vs Temperature Short Circuit Frequency vs Temperature Figure 15. Figure 16.
PAGE 9
LM2586 www.ti.com SNVS121D – MAY 1996 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Shutdown Supply Current vs Temperature ON/OFF Pin Current vs Voltage Figure 17. Figure 18. Oscillator Frequency vs Resistance Figure 19.
PAGE 10
LM2586 SNVS121D – MAY 1996 – REVISED APRIL 2013 www.ti.com Flyback Regulator Test Circuits CIN1—100 μF, 25V Aluminum Electrolytic CIN2—0.1 μF Ceramic T—22 μH, 1:1 Schott #67141450 D—1N5820 COUT—680 μF, 16V Aluminum Electrolytic CC—0.47 μF Ceramic RC—2k Figure 20. LM2586-3.3 and LM2586-5.
PAGE 11
LM2586 www.ti.com SNVS121D – MAY 1996 – REVISED APRIL 2013 CIN1—100 μF, 25V Aluminum Electrolytic CIN2—0.1 μF Ceramic L—15 μH, Renco #RL-5472-5 D—1N5820 COUT—680 μF, 16V Aluminum Electrolytic CC—0.47 μF Ceramic RC—2k For 12V Devices: R1 = Short (0Ω) and 2 = Open For ADJ Devices: R1 = 48.75k, ±0.1% and 2 = 5.62k, ±0.1% Figure 21. LM2586-12 and LM2586-ADJ Block Diagram For Fixed Versions 3.3V, R1 = 3.4k, R2 = 2k 5.0V, R1 = 6.15k, R2 = 2k 12V, R1 = 8.73k, R2 = 1k For Adj.
PAGE 12
LM2586 SNVS121D – MAY 1996 – REVISED APRIL 2013 www.ti.com Flyback Regulator Operation The LM2586 is ideally suited for use in the flyback regulator topology. The flyback regulator can produce a single output voltage, such as the one shown in Figure 22, or multiple output voltages. In Figure 22, the flyback regulator generates an output voltage that is inside the range of the input voltage. This feature is unique to flyback regulators and cannot be duplicated with buck or boost regulators.
PAGE 13
LM2586 www.ti.com SNVS121D – MAY 1996 – REVISED APRIL 2013 Typical Performance Characteristics A: Switch Voltage, 20V/div B: Switch Current, 2A/div C: Output Rectifier Current, 2A/div D: Output Ripple Voltage, 50 mV/div AC-Coupled Figure 23. Switching Waveforms Figure 24. VOUT Response to Load Current Step Typical Flyback Regulator Applications Figure 25 through Figure 30 show six typical flyback applications, varying from single output to triple output.
PAGE 14
LM2586 SNVS121D – MAY 1996 – REVISED APRIL 2013 www.ti.com Figure 25. Single-Output Flyback Regulator Figure 26.
PAGE 15
LM2586 www.ti.com SNVS121D – MAY 1996 – REVISED APRIL 2013 Figure 27. Single-Output Flyback Regulator Figure 28.
PAGE 16
LM2586 SNVS121D – MAY 1996 – REVISED APRIL 2013 www.ti.com Figure 29. Dual-Output Flyback Regulator Figure 30.
PAGE 17
LM2586 www.ti.com SNVS121D – MAY 1996 – REVISED APRIL 2013 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.
PAGE 18
LM2586 SNVS121D – MAY 1996 – REVISED APRIL 2013 www.ti.com TRANSFORMER FOOTPRINTS Figure 31 through Figure 45 show the footprints of each transformer, listed in Table 2. T7 T6 Figure 31. Coilcraft S6000-A (Top View) Figure 32. Coilcraft Q4339-B (Top View) T5 T5 Figure 33. Coilcraft Q4437-B (Surface Mount) (Top View) Figure 34. Coilcraft Q4338-B (Top View) T7 T6 Figure 35. Coilcraft S6057-A (Surface Mount) (Top View) Figure 36. Coilcraft Q4438-B (Surface Mount) (Top View) T7 T6 Figure 37.
PAGE 19
LM2586 www.ti.com SNVS121D – MAY 1996 – REVISED APRIL 2013 T6 T5 Figure 41. Renco RL-5533 (Top View) Figure 42. Renco RL-5532 (Top View) T7 T6 Figure 43. Schott 26606 (Top View) Figure 44. Schott 67140900 (Top View) T5 Figure 45.
PAGE 20
LM2586 SNVS121D – MAY 1996 – REVISED APRIL 2013 www.ti.com Step-Up (Boost) Regulator Operation Figure 46 shows the LM2586 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 the LM2586 Boost Regulator works is as follows (refer to Figure 46). When the NPN switch turns on, the inductor current ramps up at the rate of VIN/L, storing energy in the inductor.
PAGE 21
LM2586 www.ti.com SNVS121D – MAY 1996 – REVISED APRIL 2013 Typical Performance Characteristics A: Switch Voltage,10V/div B: Switch Current, 2A/div C: Inductor Current, 2A/div D: Output Ripple Voltage,100 mV/div, AC-Coupled Figure 47. Switching Waveforms Figure 48. VOUT Response to Load Current Step Typical Boost Regulator Applications Figure 49 through Figure 52 show four typical boost applications—one fixed and three using the adjustable version of the LM2586.
PAGE 22
LM2586 SNVS121D – MAY 1996 – REVISED APRIL 2013 www.ti.com Table 3. Inductor Selection Table Coilcraft Pulse (1) (2) Renco (3) Schott (4) Schott (4) (Surface Mount) DO3316-153 (1) (2) (3) (4) PE-53898 RL-5471-7 67146510 67146540 Coilcraft Inc., Phone: (800) 322-2645 1102 Silver Lake Road, Cary, IL 60013 Fax: (708) 639-1469 European Headquarters, 21 Napier Place Phone: +44 1236 730 595 Wardpark North, Cumbernauld, Scotland G68 0LL Fax: +44 1236 730 627 Pulse Engineering Inc.
PAGE 23
LM2586 www.ti.com SNVS121D – MAY 1996 – REVISED APRIL 2013 Figure 52. +24V to +48V Boost Regulator (1) The LM2586 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 the Application Hints.
PAGE 24
LM2586 SNVS121D – MAY 1996 – REVISED APRIL 2013 www.ti.com APPLICATION HINTS LM2586 SPECIAL FEATURES Figure 53. Shutdown Operation SHUTDOWN CONTROL A feature of the LM2586 is its ability to be shut down using the ON /OFF pin (pin 1). This feature conserves input power by turning off the device when it is not in use. For proper operation, an isolation diode is required (as shown in Figure 53). The device will shut down when 3V or greater is applied on the ON /OFF pin, sourcing current into pin 1.
PAGE 25
LM2586 www.ti.com SNVS121D – MAY 1996 – REVISED APRIL 2013 FREQUENCY SYNCHRONIZATION Another feature of the LM2586 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 output power. A negative falling pulse applied to the sync pin will synchronize the LM2586 to an external oscillator (see Figure 54 and Figure 55).
PAGE 26
LM2586 SNVS121D – MAY 1996 – REVISED APRIL 2013 www.ti.com PROGRAMMING OUTPUT VOLTAGE (SELECTING R1 AND R2) Referring to the adjustable regulator in Figure 56, the output voltage is programmed by the resistors R1 and R2 by the following formula: VOUT = VREF (1 + R1/R2) where • VREF = 1.23V (1) Resistors R1 and R2 divide the output voltage down so that it can be compared with the 1.23V internal reference. With R2 between 1k and 5k, R1 is: R1 = R2 (VOUT/VREF − 1) where • VREF = 1.
PAGE 27
LM2586 www.ti.com SNVS121D – MAY 1996 – REVISED APRIL 2013 Figure 57. Flyback Regulator In addition, a small bypass capacitor is required due to the noise generated by the input current pulses. To eliminate the noise, insert a 1.0 μF ceramic capacitor between VIN and ground as close as possible to the device.
PAGE 28
LM2586 SNVS121D – MAY 1996 – REVISED APRIL 2013 www.ti.com Figure 58. Input Line Filter OUTPUT VOLTAGE LIMITATIONS The maximum output voltage of a boost regulator is the maximum switch voltage minus a diode drop.
PAGE 29
LM2586 www.ti.com SNVS121D – MAY 1996 – REVISED APRIL 2013 Figure 59. 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.
PAGE 30
LM2586 SNVS121D – MAY 1996 – REVISED APRIL 2013 www.ti.com 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 (8) 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.
PAGE 31
LM2586 www.ti.com SNVS121D – MAY 1996 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision C (April 2013) to Revision D • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
PAGE 32
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) LM2586S-12/NOPB ACTIVE DDPAK/ TO-263 KTW 7 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2586S -12 P+ LM2586S-3.3/NOPB ACTIVE DDPAK/ TO-263 KTW 7 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2586S -3.
PAGE 33
PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined.
PAGE 34
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 LM2586SX-3.3/NOPB DDPAK/ TO-263 KTW 7 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM2586SX-5.0/NOPB DDPAK/ TO-263 KTW 7 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM2586SX-ADJ DDPAK/ TO-263 KTW 7 500 330.0 24.4 10.75 14.
PAGE 35
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) LM2586SX-3.3/NOPB DDPAK/TO-263 KTW 7 500 367.0 367.0 45.0 LM2586SX-5.0/NOPB DDPAK/TO-263 KTW 7 500 367.0 367.0 45.0 LM2586SX-ADJ DDPAK/TO-263 KTW 7 500 367.0 367.0 45.0 LM2586SX-ADJ/NOPB DDPAK/TO-263 KTW 7 500 367.0 367.0 45.
PAGE 36
MECHANICAL DATA NDZ0007B TA07B (Rev E) www.ti.
PAGE 37
MECHANICAL DATA KTW0007B TS7B (Rev E) BOTTOM SIDE OF PACKAGE www.ti.
PAGE 38
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.