Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - DC/DC voltage regulator Boost, Flyback, Forward converter TO 263 7

LM2588

www.ti.com

SNVS117D –APRIL 1998–REVISED APRIL 2013

LM2588 SIMPLE SWITCHER

5A Flyback Regulator with Shutdown

Check for Samples: LM2588

FEATURES

DESCRIPTION

The LM2588 series of regulators are monolithic

2345

• 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

• 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 5.0A 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

Connection Diagrams

7-Pin Bent, 7-Pin

Top View Side View

Figure 1. LM2588T-12 or LM2588T-ADJ

See Package Number NDZ0007B

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.

2Switchers Made Simple is a trademark of Texas Instruments.

3SIMPLE SWITCHER is a registered trademark of Texas Instruments.

4Switchers Made Simple is a registered trademark of dcl_owner.

5All 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
LM2588 www.ti.com SNVS117D – APRIL 1998 – REVISED APRIL 2013 LM2588 SIMPLE SWITCHER® 5A Flyback Regulator with Shutdown Check for Samples: LM2588 FEATURES DESCRIPTION • Requires Few External Components • Family of Standard Inductors and Transformers • NPN Output Switches 5.
PAGE 2
LM2588 SNVS117D – APRIL 1998 – REVISED APRIL 2013 www.ti.com 7-Pin Top View 7-Pin Side View Figure 2. LM2588S-12 or LM2588S-ADJ See Package Number KTW0007B These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
PAGE 3
LM2588 www.ti.com SNVS117D – APRIL 1998 – 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 −0.4V ≤ VSH ≤ 6V ON /OFF Pin Voltage −0.
PAGE 4
LM2588 SNVS117D – APRIL 1998 – REVISED APRIL 2013 www.ti.com LM2588-3.3 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 3.17/3.14 3.43/3.46 V SYSTEM PARAMETERS Test Circuit of Figure 18 (1) VOUT Output Voltage VIN = 4V to 12V ILOAD = 400 mA to 1.75A 3.
PAGE 5
LM2588 www.ti.com SNVS117D – APRIL 1998 – REVISED APRIL 2013 LM2588-5.0 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 18 (1) VOUT Output Voltage VIN = 4V to 12V ILOAD = 500 mA to 1.45A 5.
PAGE 6
LM2588 SNVS117D – APRIL 1998 – REVISED APRIL 2013 www.ti.com LM2588-12 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 20 100/200 mV 20 100/200 mV SYSTEM PARAMETERS Test Circuit of Figure 19 (1) VOUT Output Voltage VIN = 4V to 10V ILOAD = 300 mA to 1.
PAGE 7
LM2588 www.ti.com SNVS117D – APRIL 1998 – REVISED APRIL 2013 LM2588-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 19 (1) VOUT Output Voltage VIN = 4V to 10V ILOAD = 300 mA to 1.
PAGE 8
LM2588 SNVS117D – APRIL 1998 – 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. Typical Min Max Units IEAO Symbol Error Amp Output Current (Source or Sink) Parameters See (4) Conditions 165 110/70 260/320 μA ISS Soft Start Current VFEEDBACK = 0.92V VCOMP = 1.0V 11.0 8.0/7.
PAGE 9
LM2588 www.ti.com SNVS117D – APRIL 1998 – REVISED APRIL 2013 Typical Performance Characteristics Supply Current vs Temperature Reference Voltage vs Temperature Figure 3. Figure 4. ΔReference Voltage vs Supply Voltage Supply Current vs Switch Current Figure 5. Figure 6. Current Limit vs Temperature Feedback Pin Bias Current vs Temperature Figure 7. Figure 8.
PAGE 10
LM2588 SNVS117D – APRIL 1998 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 10 Switch Saturation Voltage vs Temperature Switch Transconductance vs Temperature Figure 9. Figure 10. Oscillator Frequency vs Temperature Error Amp Transconductance vs Temperature Figure 11. Figure 12. Error Amp Voltage Gain vs Temperature Short Circuit Frequency vs Temperature Figure 13. Figure 14.
PAGE 11
LM2588 www.ti.com SNVS117D – APRIL 1998 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Shutdown Supply Current vs Temperature ON /OFF Pin Current vs Voltage Figure 15. Figure 16. Oscillator Frequency vs Resistance Figure 17.
PAGE 12
LM2588 SNVS117D – APRIL 1998 – REVISED APRIL 2013 www.ti.com Flyback Regulator Test Circuits CIN1—100 μF, 25V Aluminum ElectrolyticCIN2—0.1 μF CeramicT—22 μH, 1:1 Schott #67141450D—1N5820COUT—680 μF, 16V Aluminum ElectrolyticCC—0.47 μF CeramicRC—2k Figure 18. LM2588-3.3 and LM2588-5.
PAGE 13
LM2588 www.ti.com SNVS117D – APRIL 1998 – REVISED APRIL 2013 CIN1—100 μF, 25V Aluminum ElectrolyticCIN2—0.1 μF CeramicL—15 μH, Renco #RL-5472-5D—1N5820COUT—680 μF, 16V Aluminum ElectrolyticCC—0.47 μF CeramicRC—2kFor 12V Devices: R1 = Short (0Ω) andR2 = OpenFor ADJ Devices: R1 = 48.75k, ±0.1% andR2 = 5.62k, ±0.1% Figure 19. LM2588-12 and LM2588-ADJ Block Diagram For Fixed Versions 3.3V, R1 = 3.4k, R2 = 2k5.0V, R1 = 6.15k, R2 = 2k12V, R1 = 8.73k, R2 = 1kFor Adj.
PAGE 14
LM2588 SNVS117D – APRIL 1998 – REVISED APRIL 2013 www.ti.com The operation of a flyback regulator is as follows (refer to Figure 20): when the switch is on, current flows through the primary winding of the transformer, T1, storing energy in the magnetic field of the transformer. Note that the primary and secondary windings are out of phase, so no current flows through the secondary when current flows through the primary.
PAGE 15
LM2588 www.ti.com SNVS117D – APRIL 1998 – REVISED APRIL 2013 Typical Performance Characteristics A: Switch Voltage, 10V/div B: Switch Current, 5A/div C: Output Rectifier Current, 5A/div D: Output Ripple Voltage, 100 mV/div AC-Coupled Figure 21. Switching Waveforms Figure 22.
PAGE 16
LM2588 SNVS117D – APRIL 1998 – REVISED APRIL 2013 www.ti.com Typical Flyback Regulator Applications Figure 23 through 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 Table 1.
PAGE 17
LM2588 www.ti.com SNVS117D – APRIL 1998 – REVISED APRIL 2013 Figure 25. Single-Output Flyback Regulator Figure 26.
PAGE 18
LM2588 SNVS117D – APRIL 1998 – REVISED APRIL 2013 www.ti.com Figure 27. Dual-Output Flyback Regulator Figure 28. 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.
PAGE 19
LM2588 www.ti.com SNVS117D – APRIL 1998 – REVISED APRIL 2013 Table 1. Transformer Selection Table Applications Figure 23 Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 Transformers T1 T1 T1 T2 T3 T4 18V–36V VIN 4V–6V 4V–6V 8V–16V 4V–6V 18V–36V VOUT1 3.3V 5V 12V 12V 12V 5V IOUT1 (Max) 1.8A 1.4A 1.2A 0.3A 1A 2.5A 1 1 1 2.5 0.8 0.35 VOUT2 −12V −12V 12V IOUT2 (Max) 0.3A 1A 0.5A 2.5 0.8 0.8 N1 N2 VOUT3 −12V IOUT3 (Max) 0.5A N3 0.8 Table 2.
PAGE 20
LM2588 SNVS117D – APRIL 1998 – REVISED APRIL 2013 20 www.ti.com Figure 33. T1 - Top View Coilcraft Q4435-B (Surface Mount) Figure 34. T2 - Top View Coilcraft Q4436-B (Surface Mount) Figure 35. T1 - Top View Pulse PE-68411 (Surface Mount) Figure 36. T2 - Top View Pulse PE-68412 (Surface Mount) Figure 37. T3 - Top View Pulse PE-68421 (Surface Mount) Figure 38. T4 - Top View Pulse PE-68422 (Surface Mount) Figure 39. T1 - Top View Renco RL-5530 Figure 40. T2 - Top View Renco RL-5531 Figure 41.
PAGE 21
LM2588 www.ti.com SNVS117D – APRIL 1998 – REVISED APRIL 2013 Figure 43. T1 - Top View Schott 67141450 Figure 44. T2 - Top View Schott 67140860 Figure 45. T3 - Top View Schott 67140920 Figure 46. T4 - Top View Schott 67140930 Step-Up (Boost) Regulator Operation Figure 47 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.
PAGE 22
LM2588 SNVS117D – APRIL 1998 – REVISED APRIL 2013 www.ti.com 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 48. Switching Waveforms Figure 49.
PAGE 23
LM2588 www.ti.com SNVS117D – APRIL 1998 – REVISED APRIL 2013 TYPICAL BOOST REGULATOR APPLICATIONS Figure 50 and Figure 51 through Figure 53 show four typical boost applications—one fixed and three using the adjustable version of the LM2588. Each drawing contains the part number(s) and manufacturer(s) for every component. For the fixed 12V output application, the part numbers and manufacturers' names for the inductor are listed in a table in Table 3.
PAGE 24
LM2588 SNVS117D – APRIL 1998 – REVISED APRIL 2013 www.ti.com Figure 52. +24V to +36V Boost Regulator *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 heat sink needed, see the HEAT SINK/THERMAL CONSIDERATIONS section in the Application Hints. Figure 53. +24V to +48V Boost Regulator Application Hints LM2588 SPECIAL FEATURES Figure 54.
PAGE 25
LM2588 www.ti.com SNVS117D – APRIL 1998 – REVISED APRIL 2013 The device will shut down when 3V or greater is applied on the ON /OFF pin, sourcing current into pin 1. In shut down mode, the device will draw typically 56 μA of supply current (16 μA to VIN and 40 μA to the ON /OFF pin). To turn the device back on, leave pin 1 floating, using an (isolation) diode, as shown in Figure 54 (for normal operation, do not source or sink current to or from this pin—see the next section).
PAGE 26
LM2588 SNVS117D – APRIL 1998 – REVISED APRIL 2013 www.ti.com Figure 56. Waveforms of a Synchronized 12V Boost Regulator The scope photo in Figure 56 shows a LM2588 12V Boost Regulator synchronized to a 200 kHz signal. There is a 700 ns delay between the falling edge of the sync signal and the turning on of the switch.
PAGE 27
LM2588 www.ti.com SNVS117D – APRIL 1998 – REVISED APRIL 2013 Figure 57. Boost Regulator Figure 58. Flyback Regulator 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 58). Both are required due to the inherent operation of a flyback regulator.
PAGE 28
LM2588 SNVS117D – APRIL 1998 – REVISED APRIL 2013 www.ti.com where VF is the forward biased voltage of the output diode, and is typically 0.5V for Schottky diodes and 0.8V for ultra-fast recovery diodes. In certain circuits, there exists a voltage spike, VLL, superimposed on top of the steady-state voltage (see Figure 21, waveform A). Usually, this voltage spike is caused by the transformer leakage inductance and/or the output rectifier recovery time.
PAGE 29
LM2588 www.ti.com SNVS117D – APRIL 1998 – REVISED APRIL 2013 NOISY INPUT LINE CONDITION A small, low-pass RC filter should be used at the input pin of the LM2588 if the input voltage has an unusually large amount of transient noise, such as with an input switch that bounces. The circuit in Figure 59 demonstrates the layout of the filter, with the capacitor placed from the input pin to ground and the resistor placed between the input supply and the input pin.
PAGE 30
LM2588 SNVS117D – APRIL 1998 – REVISED APRIL 2013 www.ti.com (7) VIN is the minimum input voltage, VOUT is the output voltage, N is the transformer turns ratio, D is the duty cycle, and ILOAD is the maximum load current (and ∑ILOAD is the sum of the maximum load currents for multiple-output flyback regulators). The duty cycle is given by: Boost: (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.
PAGE 31
LM2588 www.ti.com SNVS117D – APRIL 1998 – 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) LM2588S-12/NOPB ACTIVE DDPAK/ TO-263 KTW 7 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2588S -12 P+ LM2588S-3.3/NOPB ACTIVE DDPAK/ TO-263 KTW 7 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2588S -3.
PAGE 33
PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 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. (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.
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 LM2588SX-12/NOPB DDPAK/ TO-263 KTW 7 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM2588SX-3.3/NOPB DDPAK/ TO-263 KTW 7 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM2588SX-5.0 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) LM2588SX-12/NOPB DDPAK/TO-263 KTW 7 500 367.0 367.0 45.0 LM2588SX-3.3/NOPB DDPAK/TO-263 KTW 7 500 367.0 367.0 45.0 LM2588SX-5.0 DDPAK/TO-263 KTW 7 500 367.0 367.0 45.0 LM2588SX-5.0/NOPB DDPAK/TO-263 KTW 7 500 367.0 367.0 45.0 LM2588SX-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.