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LM2577S-ADJ

LM2577S-ADJ

  • 厂商:

    BURR-BROWN(德州仪器)

  • 封装:

    TO263-6

  • 描述:

    IC REG MULT CONFG ADJ 3A TO263

  • 数据手册
  • 价格&库存
LM2577S-ADJ 数据手册
LM1577, LM2577 www.ti.com SNOS658C – MAY 2004 – REVISED APRIL 2005 LM1577/LM2577 SIMPLE SWITCHER® Step-Up Voltage Regulator Check for Samples: LM1577, LM2577 FEATURES • • • • • TYPICAL APPLICATIONS 1 23 • • Requires few external components NPN output switches 3.0A, can stand off 65V Wide input voltage range: 3.5V to 40V Current-mode operation for improved transient response, line regulation, and current limit 52 kHz internal oscillator Soft-start function reduces in-rush current during start-up • • • Output switch protected by current limit, under-voltage lockout, and thermal shutdown Simple boost regulator Flyback and forward regulators Multiple-output regulator DESCRIPTION The LM1577/LM2577 are monolithic integrated circuits that provide all of the power and control functions for step-up (boost), flyback, and forward converter switching regulators. The device is available in three different output voltage versions: 12V, 15V, and adjustable. Requiring a minimum number of external components, these regulators are cost effective, and simple to use. Listed in this data sheet are a family of standard inductors and flyback transformers designed to work with these switching regulators. Included on the chip is a 3.0A NPN switch and its associated protection circuitry, consisting of current and thermal limiting, and undervoltage lockout. Other features include a 52 kHz fixed-frequency oscillator that requires no external components, a 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. Connection Diagrams Straight Leads 5-Lead TO-220 (T) Figure 1. Top View Order Number LM2577T-12, LM2577T-15, or LM2577T-ADJ See NS Package Number T05A 1 2 3 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. SIMPLE SWITCHER is a registered trademark of Texas Instruments. All 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. Copyright © 2004–2005, Texas Instruments Incorporated LM1577, LM2577 SNOS658C – MAY 2004 – REVISED APRIL 2005 www.ti.com Bent, Staggered Leads 5-Lead TO-220 (T) Figure 2. Top View Order Number LM2577T-12 Flow LB03, LM2577T-15 Flow LB03, or LM2577T-ADJ Flow LB03 See NS Package Number T05D 16-Lead DIP (N) *No internal Connection Figure 3. Top View Order Number LM2577N-12, LM2577N-15, or LM2577N-ADJ See NS Package Number N16A 24-Lead Surface Mount (M) *No internal Connection Figure 4. Top View Order Number LM2577M-12, LM2577M-15, or LM2577M-ADJ See NS Package Number M24B 2 Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658C – MAY 2004 – REVISED APRIL 2005 TO-263 (S) 5-Lead Surface-Mount Package Figure 5. Top View Figure 6. Side View Order Number LM2577S-12, LM2577S-15, or LM2577S-ADJ See NS Package Number TS5B 4-Lead TO-3 (K) Figure 7. Bottom View Order Number LM1577K-12/883, LM1577K-15/883, or LM1577K-ADJ/883 See NS Package Number K04A Typical Application Note: Pin numbers shown are for TO-220 (T) package. 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. Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 3 LM1577, LM2577 SNOS658C – MAY 2004 – REVISED APRIL 2005 Absolute Maximum Ratings www.ti.com (1) Supply Voltage 45V Output Switch Voltage Output Switch Current 65V (2) 6.0A Power Dissipation Internally Limited Storage Temperature Range −65°C to +150°C Lead Temperature (Soldering, 10 sec.) 260°C Maximum Junction Temperature 150°C Minimum ESD Rating (C = 100 pF, R = 1.5 kΩ) (1) (2) 2 kV Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions the device is intended to be functional, but device parameter specifications may not be guaranteed under these conditions. For guaranteed specifications and test conditions, see the Electrical Characteristics. Due to timing considerations of the LM1577/LM2577 current limit circuit, output current cannot be internally limited when the LM1577/LM2577 is used as a step-up regulator. To prevent damage to the switch, its current must be externally limited to 6.0A. However, output current is internally limited when the LM1577/LM2577 is used as a flyback or forward converter regulator in accordance to the Application Hints. Operating Ratings 3.5V ≤ VIN ≤ 40V Supply Voltage Output Switch Voltage 0V ≤ VSWITCH ≤ 60V Output Switch Current ISWITCH ≤ 3.0A Junction Temperature Range 4 LM1577 −55°C ≤ TJ ≤ +150°C LM2577 −40°C ≤ TJ ≤ +125°C Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658C – MAY 2004 – REVISED APRIL 2005 Electrical Characteristics—LM1577-12, LM2577-12 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, and ISWITCH = 0. Symbol Parameter Conditions Typical LM1577-12 LM2577-12 Units Limit Limit (Limits) (1) (2) (3) SYSTEM PARAMETERS Circuit of Figure 8 VOUT Output Voltage (4) VIN = 5V to 10V 12.0 ILOAD = 100 mA to 800 mA (1) Line Regulation VIN = 3.5V to 10V V 11.60/11.40 11.60/11.40 V(min) 12.40/12.60 12.40/12.60 V(max) 50/100 50/100 mV(max) 20 ILOAD = 300 mA mV (1) Load Regulation VIN = 5V 20 ILOAD = 100 mA to 800 mA mV 50/100 50/100 mV(max) (2) η Efficiency VIN = 5V, ILOAD = 800 mA 80 VFEEDBACK = 14V (Switch Off) 7.5 % DEVICE PARAMETERS IS Input Supply Current ISWITCH = 2.0A Input Supply ISWITCH = 100 mA Oscillator Frequency Measured at Switch Pin Output Reference Measured at Feedback Pin Voltage VIN = 3.5V to 40V VIN = 3.5V to 40V 50/85 mA(max) 2.70/2.65 2.70/2.65 V(min) 3.10/3.15 3.10/3.15 V(max) 48/42 48/42 kHz(min) 56/62 56/62 kHz(max) 11.76/11.64 11.76/11.64 V(min) 12.24/12.36 12.24/12.36 V(max) mA V kHz V 12 VCOMP = 1.0V Output Reference 50/85 52 ISWITCH = 100 mA VREF mA(max) 2.90 Undervoltage Lockout fO 10.0/14.0 25 VCOMP = 2.0V (Max Duty Cycle) VUV mA 10.0/14.0 7 mV 9.7 kΩ 370 μmho Voltage Line Regulator (3) RFB Feedback Pin Input Resistance GM (1) (2) (3) (4) Error Amp ICOMP = −30 μA to +30 μA Transconductance VCOMP = 1.0V 225/145 225/145 μmho(min) 515/615 515/615 μmho(max) All limits guaranteed at room temperature (standard type face) and at temperature extremes (boldface type). All limits are used to calculate Outgoing Quality Level, and are 100% production tested. A military RETS electrical test specification is available on request. At the time of printing, the LM1577K-12/883, LM1577K-15/883, and LM1577K-ADJ/883 RETS specifications complied fully with the boldface limits in these columns. The LM1577K-12/883, LM1577K15/883, and LM1577K-ADJ/883 may also be procured to Standard Military Drawing specifications. All limits guaranteed at room temperature (standard type face) and at temperature extremes (boldface type). All room temperature limits are 100% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the LM1577/LM2577 is used as shown in the Test Circuit, system performance will be as specified by the system parameters. Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 5 LM1577, LM2577 SNOS658C – MAY 2004 – REVISED APRIL 2005 www.ti.com Electrical Characteristics—LM1577-12, LM2577-12 (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, and ISWITCH = 0. Symbol Parameter Conditions Typical LM1577-12 LM2577-12 Units Limit Limit (Limits) (1) (2) (3) AVOL Error Amp VCOMP = 1.1V to 1.9V Voltage Gain RCOMP = 1.0 MΩ 80 V/V 50/25 50/25 V/V(min) 2.2/2.0 2.2/2.0 V(min) (5) Error Amplifier Upper Limit Output Swing VFEEDBACK = 10.0V Lower Limit 2.4 0.3 VFEEDBACK = 15.0V ISS Error Amplifier VFEEDBACK = 10.0V to 15.0V Output Current VCOMP = 1.0V Soft Start Current VFEEDBACK = 10.0V Maximum Duty Cycle VCOMP = 1.5V 0.40/0.55 0.40/0.55 V(max) ±130/±90 ±130/±90 μA(min) ±300/±400 ±300/±400 μA(max) 2.5/1.5 2.5/1.5 μA(min) 7.5/9.5 7.5/9.5 μA(max) 93/90 93/90 %(min) μA μA 5.0 95 ISWITCH = 100 mA Switch Transconductance V ±200 VCOMP = 0V D V % 12.5 A/V (4) IL VSAT Switch Leakage VSWITCH = 65V Current VFEEDBACK = 15V (Switch Off) Switch Saturation ISWITCH = 2.0A Voltage VCOMP = 2.0V (Max Duty Cycle) NPN Switch 6 300/600 300/600 μA(max) 0.7/0.9 0.7/0.9 V(max) 3.7/3.0 3.7/3.0 A(min) 5.3/6.0 5.3/6.0 A(max) 0.5 V 4.5 Current Limit (5) μA 10 A A 1.0 MΩ resistor is connected to the compensation pin (which is the error amplifier's output) to ensure accuracy in measuring AVOL. In actual applications, this pin's load resistance should be ≥10 MΩ, resulting in AVOL that is typically twice the guaranteed minimum limit. Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658C – MAY 2004 – REVISED APRIL 2005 Electrical Characteristics—LM1577-15, LM2577-15 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, and ISWITCH = 0. Symbol Parameter Conditions Typical LM1577-15 LM2577-15 Units Limit Limit (Limits) (1) (2) (3) SYSTEM PARAMETERS Circuit of Figure 9 VOUT Output Voltage (4) VIN = 5V to 12V 15.0 ILOAD = 100 mA to 600 mA (1) Line Regulation 20 ILOAD = 300 mA (5) Load Regulation VIN = 5V 20 ILOAD = 100 mA to 600 mA (6) η VIN = 3.5V to 12V Efficiency VIN = 5V, ILOAD = 600 mA 80 VFEEDBACK = 18.0V 7.5 V 14.50/14.25 14.50/14.25 V(min) 15.50/15.75 15.50/15.75 V(max) 50/100 50/100 50/100 50/100 mV mV(max) mV mV(max) % DEVICE PARAMETERS IS Input Supply Current (Switch Off) ISWITCH = 2.0A mA 10.0/14.0 10.0/14.0 mA(max) 50/85 50/85 mA(max) 2.70/2.65 2.70/2.65 V(min) 3.10/3.15 3.10/3.15 V(max) 48/42 48/42 kHz(min) 56/62 56/62 kHz(max) 14.70/14.55 14.70/14.55 V(min) 15.30/15.45 15.30/15.45 V(max) 25 VCOMP = 2.0V mA (Max Duty Cycle) VUV Input Supply ISWITCH = 100 mA 2.90 Undervoltage Lockout fO Oscillator Frequency Measured at Switch Pin 52 ISWITCH = 100 mA VREF Output Reference Measured at Feedback Pin Voltage VIN = 3.5V to 40V VIN = 3.5V to 40V kHz V 15 VCOMP = 1.0V Output Reference V 10 mV 12.2 kΩ Voltage Line Regulation RFB Feedback Pin Input Voltage Line Regulator GM AVOL Error Amp ICOMP = −30 μA to +30 μA Transconductance VCOMP = 1.0V Error Amp VCOMP = 1.1V to 1.9V Voltage Gain RCOMP = 1.0 MΩ μmho 300 170/110 170/110 μmho(min) 420/500 420/500 μmho(max) 40/20 40/20 V/V(min) 65 V/V (5) (1) (2) (3) (4) (5) All limits guaranteed at room temperature (standard type face) and at temperature extremes (boldface type). All limits are used to calculate Outgoing Quality Level, and are 100% production tested. A military RETS electrical test specification is available on request. At the time of printing, the LM1577K-12/883, LM1577K-15/883, and LM1577K-ADJ/883 RETS specifications complied fully with the boldface limits in these columns. The LM1577K-12/883, LM1577K15/883, and LM1577K-ADJ/883 may also be procured to Standard Military Drawing specifications. All limits guaranteed at room temperature (standard type face) and at temperature extremes (boldface type). All room temperature limits are 100% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the LM1577/LM2577 is used as shown in the Test Circuit, system performance will be as specified by the system parameters. A 1.0 MΩ resistor is connected to the compensation pin (which is the error amplifier's output) to ensure accuracy in measuring AVOL. In actual applications, this pin's load resistance should be ≥10 MΩ, resulting in AVOL that is typically twice the guaranteed minimum limit. Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 7 LM1577, LM2577 SNOS658C – MAY 2004 – REVISED APRIL 2005 www.ti.com Electrical Characteristics—LM1577-15, LM2577-15 (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, and ISWITCH = 0. Symbol Parameter Conditions Typical LM1577-15 LM2577-15 Units Limit Limit (Limits) (1) (2) (3) Error Amplifier Upper Limit Output Swing VFEEDBACK = 12.0V Lower Limit 2.4 ISS VFEEDBACK = 12.0V to 18.0V Output Current VCOMP = 1.0V Soft Start Current VFEEDBACK = 12.0V Maximum Duty VCOMP = 1.5V Cycle ISWITCH = 100 mA Switch Transconductance V(min) V 0.4/0.55 0.40/0.55 V(max) ±130/±90 ±130/±90 μA(min) ±300/±400 ±300/±400 μA(max) 2.5/1.5 2.5/1.5 μA(min) 7.5/9.5 7.5/9.5 μA(max) 93/90 93/90 %(min) μA ±200 μA 5.0 VCOMP = 0V D 2.2/2.0 0.3 VFEEDBACK = 18.0V Error Amp V 2.2/2.0 95 % 12.5 A/V (7) IL Switch Leakage VSWITCH = 65V Current VFEEDBACK = 18.0V μA 10 300/600 300/600 μA(max) 0.7/0.9 0.7/0.9 V(max) 3.7/3.0 3.7/3.0 A(min) 5.3/6.0 5.3/6.0 A(max) (Switch Off) VSAT Switch Saturation ISWITCH = 2.0A Voltage VCOMP = 2.0V 0.5 V (Max Duty Cycle) NPN Switch VCOMP = 2.0V 4.3 Current Limit 8 Submit Documentation Feedback A Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658C – MAY 2004 – REVISED APRIL 2005 Electrical Characteristics—LM1577-ADJ, LM2577-ADJ 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, VFEEDBACK = VREF, and ISWITCH = 0. Symbol Parameter Conditions Typical LM1577-ADJ LM2577-ADJ Units Limit Limit (Limits) (1) (2) (3) SYSTEM PARAMETERS Circuit of Figure 10 VOUT Output Voltage (4) VIN = 5V to 10V 12.0 ILOAD = 100 mA to 800 mA (1) ΔVOUT/ Line Regulation ΔVIN ΔVOUT/ Load Regulation VIN = 5V V(min) 12.40/12.60 12.40/12.60 V(max) 50/100 50/100 mV(max) 50/100 50/100 mV(max) mV 20 ILOAD = 100 mA to 800 mA Efficiency 11.60/11.40 20 ILOAD = 300 mA ΔILOAD η VIN = 3.5V to 10V V 11.60/11.40 VIN = 5V, ILOAD = 800 mA 80 VFEEDBACK = 1.5V (Switch Off) 7.5 mV % DEVICE PARAMETERS IS Input Supply Current mA 10.0/14.0 ISWITCH = 2.0A 25 VCOMP = 2.0V (Max Duty Cycle) VUV Input Supply ISWITCH = 100 mA Oscillator Frequency Measured at Switch Pin VREF Reference Measured at Feedback Pin Voltage VIN = 3.5V to 40V Reference Voltage ΔVIN Line Regulation IB Error Amp AVOL (1) (2) (3) (4) (5) mA(max) 2.70/2.65 2.70/2.65 V(min) 3.10/3.15 3.10/3.15 V(max) 48/42 48/42 kHz(min) 56/62 56/62 kHz(max) 1.214/1.206 1.214/1.206 V(min) 1.246/1.254 1.246/1.254 V(max) V kHz VIN = 3.5V to 40V 0.5 mV VCOMP = 1.0V 100 nA Error Amp ICOMP = −30 μA to +30 μA 3700 Transconductance VCOMP = 1.0V Error Amp VCOMP = 1.1V to 1.9V Voltage Gain RCOMP = 1.0 MΩ Input Bias Current GM 50/85 V 1.230 VCOMP = 1.0V ΔVREF/ 50/85 52 ISWITCH = 100 mA mA(max) mA 2.90 Undervoltage Lockout fO 10.0/14.0 300/800 300/800 nA(max) 2400/1600 2400/1600 μmho(min) 4800/5800 4800/5800 μmho(max) 500/250 500/250 V/V(min) μmho 800 (5) V/V All limits guaranteed at room temperature (standard type face) and at temperature extremes (boldface type). All limits are used to calculate Outgoing Quality Level, and are 100% production tested. A military RETS electrical test specification is available on request. At the time of printing, the LM1577K-12/883, LM1577K-15/883, and LM1577K-ADJ/883 RETS specifications complied fully with the boldface limits in these columns. The LM1577K-12/883, LM1577K15/883, and LM1577K-ADJ/883 may also be procured to Standard Military Drawing specifications. All limits guaranteed at room temperature (standard type face) and at temperature extremes (boldface type). All room temperature limits are 100% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the LM1577/LM2577 is used as shown in the Test Circuit, system performance will be as specified by the system parameters. A 1.0 MΩ resistor is connected to the compensation pin (which is the error amplifier's output) to ensure accuracy in measuring AVOL. In actual applications, this pin's load resistance should be ≥10 MΩ, resulting in AVOL that is typically twice the guaranteed minimum limit. Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 9 LM1577, LM2577 SNOS658C – MAY 2004 – REVISED APRIL 2005 www.ti.com Electrical Characteristics—LM1577-ADJ, LM2577-ADJ (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, VFEEDBACK = VREF, and ISWITCH = 0. Symbol Parameter Conditions Typical LM1577-ADJ LM2577-ADJ Units Limit Limit (Limits) (1) (2) (3) Error Amplifier Upper Limit Output Swing VFEEDBACK = 1.0V 2.4 Lower Limit Error Amp VFEEDBACK = 1.0V to 1.5V Output Current VCOMP = 1.0V Soft Start Current VFEEDBACK = 1.0V Maximum Duty Cycle VCOMP = 1.5V ΔISWITCH/ Switch ΔVCOMP Transconductance IL Switch Leakage VSWITCH = 65V Current VFEEDBACK = 1.5V (Switch Off) Switch Saturation ISWITCH = 2.0A Voltage VCOMP = 2.0V (Max Duty Cycle) NPN Switch VCOMP = 2.0V VSAT 0.40/0.55 0.40/0.55 V(max) ±130/±90 ±130/±90 μA(min) ±300/±400 ±300/±400 μA(max) 2.5/1.5 2.5/1.5 μA(min) 7.5/9.5 7.5/9.5 μA(max) 93/90 93/90 %(min) μA μA 5.0 95 ISWITCH = 100 mA % 12.5 A/V μA 10 300/600 300/600 μA(max) 0.7/0.9 0.7/0.9 V(max) 0.5 V 4.3 Current Limit V(min) V ±200 VCOMP = 0V D 2.2/2.0 0.3 VFEEDBACK = 1.5V ISS V 2.2/2.0 A 3.7/3.0 3.7/3.0 A(min) 5.3/6.0 5.3/6.0 A(max) THERMAL PARAMETERS (All Versions) θJA Thermal Resistance K Package, Junction to Ambient 35 θJC K Package, Junction to Case 1.5 θJA T Package, Junction to Ambient 65 θJC T Package, Junction to Case 2 θJA N Package, Junction to 85 Ambient θJA (6) M Package, Junction to Ambient θJA (6) (7) 10 100 (6) S Package, Junction to Ambient °C/W 37 (7) Junction to ambient thermal resistance with approximately 1 square inch of pc board copper surrounding the leads. Additional copper area will lower thermal resistance further. See thermal model in “Switchers Made Simple” software. If the TO-263 package is used, the thermal resistance can be reduced by increasing the PC board copper area thermally connected to the package. Using 0.5 square inches of copper area, θJA is 50°C/W; with 1 square inch of copper area, θJA is 37°C/W; and with 1.6 or more square inches of copper area, θJA is 32°C/W. Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658C – MAY 2004 – REVISED APRIL 2005 Typical Performance Characteristics Reference Voltage vs Temperature Reference Voltage vs Temperature Reference Voltage vs Temperature Δ Reference Voltage vs Supply Voltage Δ Reference Voltage vs Supply Voltage Δ Reference Voltage vs Supply Voltage Error Amp Transconductance vs Temperature Error Amp Transconductance vs Temperature Error Amp Transconductance vs Temperature Error Amp Voltage Gain vs Temperature Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 11 LM1577, LM2577 SNOS658C – MAY 2004 – REVISED APRIL 2005 www.ti.com Typical Performance Characteristics (continued) 12 Error Amp Voltage Gain vs Temperature Error Amp Voltage Gain vs Temperature Quiescent Current vs Temperature Quiescent Current vs Switch Current Current Limit vs Temperature Current Limit Response Time vs Overdrive Switch Saturation Voltage vs Switch Current Switch Transconductance vs Temperature Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658C – MAY 2004 – REVISED APRIL 2005 Typical Performance Characteristics (continued) Feedback Pin Bias Current vs Temperature Oscillator Frequency vs Temperature Maximum Power Dissipation (TO-263) (1) LM1577-12, LM2577-12 Test Circuit L = 415-0930 (AIE) D = any manufacturer COUT = Sprague Type 673D Electrolytic 680 μF, 20V Note: Pin numbers shown are for TO-220 (T) package Figure 8. Circuit Used to Specify System Parameters for 12V Versions (1) If the TO-263 package is used, the thermal resistance can be reduced by increasing the PC board copper area thermally connected to the package. Using 0.5 square inches of copper area, θJA is 50°C/W; with 1 square inch of copper area, θJA is 37°C/W; and with 1.6 or more square inches of copper area, θJA is 32°C/W. Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 13 LM1577, LM2577 SNOS658C – MAY 2004 – REVISED APRIL 2005 www.ti.com LM1577-15, LM2577-15 Test Circuit L = 415-0930 (AIE) D = any manufacturer COUT = Sprague Type 673D Electrolytic 680 μF, 20V Note: Pin numbers shown are for TO-220 (T) package Figure 9. Circuit Used to Specify System Parameters for 15V Versions LM1577-ADJ, LM2577-ADJ Test Circuit L = 415-0930 (AIE) D = any manufacturer COUT = Sprague Type 673D Electrolytic 680 μF, 20V R1 = 48.7k in series with 511Ω (1%) R2 = 5.62k (1%) Note: Pin numbers shown are for TO-220 (T) package Figure 10. Circuit Used to Specify System Parameters for ADJ Versions 14 Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658C – MAY 2004 – REVISED APRIL 2005 Application Hints Note: Pin numbers shown are for TO-220 (T) package *Resistors are internal to LM1577/LM2577 for 12V and 15V versions. Figure 11. LM1577/LM2577 Block Diagram and Boost Regulator Application STEP-UP (BOOST) REGULATOR Figure 11 shows the LM1577-ADJ/LM2577-ADJ used as a Step-Up Regulator. This is a switching regulator used for producing an output voltage greater than the input supply voltage. The LM1577-12/LM2577-12 and LM157715/LM2577-15 can also be used for step-up regulators with 12V or 15V outputs (respectively), by tying the feedback pin directly to the regulator output. A basic explanation of how it works is as follows. The LM1577/LM2577 turns its output switch on and off at a frequency of 52 kHz, and this creates energy in the inductor (L). When the NPN switch turns on, the inductor current charges up at a rate of VIN/L, storing current 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. Thus, energy stored in the inductor during the switch on time is transferred to the output during the switch off time. The output voltage is controlled by the amount of energy transferred which, in turn, is controlled by modulating the peak inductor current. This is done by feeding back a portion of the output voltage to the error amp, which amplifies the difference between the feedback voltage and a 1.230V reference. The error amp output voltage is compared to a voltage proportional to the switch current (i.e., inductor current during the switch on time). The comparator terminates the switch on time when the two voltages are equal, thereby controlling the peak switch current to maintain a constant output voltage. Voltage and current waveforms for this circuit are shown in Figure 12, and formulas for calculating them are given in Table 1. Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 15 LM1577, LM2577 SNOS658C – MAY 2004 – REVISED APRIL 2005 www.ti.com Figure 12. Step-Up Regulator Waveforms Table 1. Step-Up Regulator Formulas Duty Cycle D Average Inductor Current Inductor Current Ripple Peak Inductor Current Peak Switch Current Switch Voltage When Off IIND(AVE) ΔIIND IIND(PK) ISW(PK) VSW(OFF) VOUT + VF Diode Reverse Voltage VR VOUT − VSAT Average Diode Current ID(AVE) ILOAD Peak Diode Current Power Dissipation of LM1577/2577 ID(PK) PD STEP-UP REGULATOR DESIGN PROCEDURE The following design procedure can be used to select the appropriate external components for the circuit in Figure 11, based on these system requirements. Given: VIN (min) = Minimum input supply voltage VOUT = Regulated output voltage ILOAD(max) = Maximum output load current Before proceeding any further, determine if the LM1577/LM2577 can provide these values of VOUT and ILOAD(max) when operating with the minimum value of VIN. The upper limits for VOUT and ILOAD(max) are given by the following equations. VOUT ≤ 60V and VOUT ≤ 10 × VIN(min) (8) These limits must be greater than or equal to the values specified in this application. 1. Inductor Selection (L) A. Voltage Options: 1. For 12V or 15V output 16 Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658C – MAY 2004 – REVISED APRIL 2005 From Figure 13 (for 12V output) or Figure 14 (for 15V output), identify inductor code for region indicated by VIN (min) and ILOAD (max). The shaded region indicates conditions for which the LM1577/LM2577 output switch would be operating beyond its switch current rating. The minimum operating voltage for the LM1577/LM2577 is 3.5V. From here, proceed to step C. 2. For Adjustable version Preliminary calculations: The inductor selection is based on the calculation of the following three parameters: D(max), the maximum switch duty cycle (0 ≤ D ≤ 0.9): (9) where VF = 0.5V for Schottky diodes and 0.8V for fast recovery diodes (typically); E •T, the product of volts × time that charges the inductor: (10) IIND,DC, the average inductor current under full load; (11) B. Identify Inductor Value: 1. From Figure 15, identify the inductor code for the region indicated by the intersection of E•T and IIND,DC. This code gives the inductor value in microhenries. The L or H prefix signifies whether the inductor is rated for a maximum E•T of 90 V•μs (L) or 250 V•μs (H). 2. If D < 0.85, go on to step C. If D ≥ 0.85, then calculate the minimum inductance needed to ensure the switching regulator's stability: (12) If LMIN is smaller than the inductor value found in step B1, go on to step C. Otherwise, the inductor value found in step B1 is too low; an appropriate inductor code should be obtained from the graph as follows: 1. Find the lowest value inductor that is greater than LMIN. 2. Find where E•T intersects this inductor value to determine if it has an L or H prefix. If E•T intersects both the L and H regions, select the inductor with an H prefix. Figure 13. LM2577-12 Inductor Selection Guide Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 17 LM1577, LM2577 SNOS658C – MAY 2004 – REVISED APRIL 2005 www.ti.com Figure 14. LM2577-15 Inductor Selection Guide Note: These charts assume that the inductor ripple current inductor is approximately 20% to 30% of the average inductor current (when the regulator is under full load). Greater ripple current causes higher peak switch currents and greater output ripple voltage; lower ripple current is achieved with larger-value inductors. The factor of 20 to 30% is chosen as a convenient balance between the two extremes. Figure 15. LM1577-ADJ/LM2577-ADJ Inductor Selection Graph C. Select an inductor from the table of Table 2 which cross-references the inductor codes to the part numbers of three different manufacturers. Complete specifications for these inductors are available from the respective manufacturers. The inductors listed in this table have the following characteristics: AIE: ferrite, pot-core inductors; Benefits of this type are low electro-magnetic interference (EMI), small physical size, and very low power dissipation (core loss). Be careful not to operate these inductors too far beyond their maximum ratings for E•T and peak current, as this will saturate the core. Pulse: powdered iron, toroid core inductors; Benefits are low EMI and ability to withstand E•T and peak current above rated value better than ferrite cores. Renco: ferrite, bobbin-core inductors; Benefits are low cost and best ability to withstand E•T and peak current above rated value. Be aware that these inductors generate more EMI than the other types, and this may interfere with signals sensitive to noise. 18 Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658C – MAY 2004 – REVISED APRIL 2005 Table 2. Table of Standardized Inductors and Manufacturer's Part Numbers Inductor Manufacturer's Part Number Code Schott Pulse Renco L47 67126980 PE - 53112 RL2442 L68 67126990 PE - 92114 RL2443 L100 67127000 PE - 92108 RL2444 L150 67127010 PE - 53113 RL1954 L220 67127020 PE - 52626 RL1953 L330 67127030 PE - 52627 RL1952 L470 67127040 PE - 53114 RL1951 L680 67127050 PE - 52629 RL1950 H150 67127060 PE - 53115 RL2445 H220 67127070 PE - 53116 RL2446 H330 67127080 PE - 53117 RL2447 H470 67127090 PE - 53118 RL1961 H680 67127100 PE - 53119 RL1960 H1000 67127110 PE - 53120 RL1959 H1500 67127120 PE - 53121 RL1958 H2200 67127130 PE - 53122 RL2448 2. Compensation Network (RC, CC) and Output Capacitor (COUT) Selection RC and CC form a pole-zero compensation network that stabilizes the regulator. The values of RC and CC are mainly dependant on the regulator voltage gain, ILOAD(max), L and COUT. The following procedure calculates values for RC, CC, and COUT that ensure regulator stability. Be aware that this procedure doesn't necessarily result in RC and CC that provide optimum compensation. In order to guarantee optimum compensation, one of the standard procedures for testing loop stability must be used, such as measuring VOUT transient response when pulsing ILOAD (see Figure 18). A. First, calculate the maximum value for RC. (13) Select a resistor less than or equal to this value, and it should also be no greater than 3 kΩ. B. Calculate the minimum value for COUT using the following two equations. (14) The larger of these two values is the minimum value that ensures stability. C. Calculate the minimum value of CC . (15) The compensation capacitor is also part of the soft start circuitry. When power to the regulator is turned on, the switch duty cycle is allowed to rise at a rate controlled by this capacitor (with no control on the duty cycle, it would immediately rise to 90%, drawing huge currents from the input power supply). In order to operate properly, the soft start circuit requires CC ≥ 0.22 μF. The value of the output filter capacitor is normally large enough to require the use of aluminum electrolytic capacitors. Table 3 lists several different types that are recommended for switching regulators, and the following parameters are used to select the proper capacitor. Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 19 LM1577, LM2577 SNOS658C – MAY 2004 – REVISED APRIL 2005 www.ti.com Working Voltage (WVDC): Choose a capacitor with a working voltage at least 20% higher than the regulator output voltage. Ripple Current: This is the maximum RMS value of current that charges the capacitor during each switching cycle. For step-up and flyback regulators, the formula for ripple current is (16) Choose a capacitor that is rated at least 50% higher than this value at 52 kHz. Equivalent Series Resistance (ESR) : This is the primary cause of output ripple voltage, and it also affects the values of RC and CC needed to stabilize the regulator. As a result, the preceding calculations for CC and RC are only valid if ESR doesn't exceed the maximum value specified by the following equations. (17) Select a capacitor with ESR, at 52 kHz, that is less than or equal to the lower value calculated. Most electrolytic capacitors specify ESR at 120 Hz which is 15% to 30% higher than at 52 kHz. Also, be aware that ESR increases by a factor of 2 when operating at −20°C. In general, low values of ESR are achieved by using large value capacitors (C ≥ 470 μF), and capacitors with high WVDC, or by paralleling smaller-value capacitors. 3. Output Voltage Selection (R1 and R2) This section is for applications using the LM1577-ADJ/LM2577-ADJ. Skip this section if the LM1577-12/LM257712 or LM1577-15/LM2577-15 is being used. With the LM1577-ADJ/LM2577-ADJ, the output voltage is given by VOUT = 1.23V (1 + R1/R2) (18) Resistors R1 and R2 divide the output down so it can be compared with the LM1577-ADJ/LM2577-ADJ internal 1.23V reference. For a given desired output voltage VOUT, select R1 and R2 so that (19) 4. Input Capacitor Selection (CIN) The switching action in the step-up regulator causes a triangular ripple current to be drawn from the supply source. This in turn causes noise to appear on the supply voltage. For proper operation of the LM1577, the input voltage should be decoupled. Bypassing the Input Voltage pin directly to ground with a good quality, low ESR, 0.1 μF capacitor (leads as short as possible) is normally sufficient. 20 Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658C – MAY 2004 – REVISED APRIL 2005 Table 3. Aluminum Electrolytic Capacitors Recommended for Switching Regulators Cornell Dublier —Types 239, 250, 251, UFT, 300, or 350 P.O. Box 128, Pickens, SC 29671 (803) 878-6311 Nichicon —Types PF, PX, or PZ 927 East Parkway, Schaumburg, IL 60173 (708) 843-7500 Sprague —Types 672D, 673D, or 674D Box 1, Sprague Road, Lansing, NC 28643 (919) 384-2551 United Chemi-Con —Types LX, SXF, or SXJ 9801 West Higgins Road, Rosemont, IL 60018 (708) 696-2000 If the LM1577 is located far from the supply source filter capacitors, an additional large electrolytic capacitor (e.g. 47 μF) is often required. 5. Diode Selection (D) The switching diode used in the boost regulator must withstand a reverse voltage equal to the circuit output voltage, and must conduct the peak output current of the LM2577. A suitable diode must have a minimum reverse breakdown voltage greater than the circuit output voltage, and should be rated for average and peak current greater than ILOAD(max) and ID(PK). Schottky barrier diodes are often favored for use in switching regulators. Their low forward voltage drop allows higher regulator efficiency than if a (less expensive) fast recovery diode was used. See Table 4 for recommended part numbers and voltage ratings of 1A and 3A diodes. Table 4. Diode Selection Chart VOUT Schottky Fast Recovery (max) 1A 3A 20V 1N5817 1N5820 MBR120P MBR320P 30V 40V 50V 1N5818 1N5821 MBR130P MBR330P 11DQ03 31DQ03 1N5819 1N5822 MBR140P MBR340P 1A 11DQ04 31DQ04 MBR150 MBR350 1N4933 11DQ05 31DQ05 MUR105 1N4934 100V 3A MR851 HER102 30DL1 MUR110 MR831 10DL1 HER302 BOOST REGULATOR CIRCUIT EXAMPLE By adding a few external components (as shown in Figure 16), the LM2577 can be used to produce a regulated output voltage that is greater than the applied input voltage. Typical performance of this regulator is shown in Figure 17 and Figure 18. The switching waveforms observed during the operation of this circuit are shown in Figure 19. Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 21 LM1577, LM2577 SNOS658C – MAY 2004 – REVISED APRIL 2005 www.ti.com Note: Pin numbers shown are for TO-220 (T) package. Figure 16. Step-up Regulator Delivers 12V from a 5V Input Figure 17. Line Regulation (Typical) of Step-Up Regulator of Figure 16 A: Output Voltage Change, 100 mV/div. (AC-coupled) B: Load current, 0.2 A/div Horizontal: 5 ms/div Figure 18. Load Transient Response of Step-Up Regulator of Figure 16 22 Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658C – MAY 2004 – REVISED APRIL 2005 A: Switch pin voltage, 10 V/div B: Switch pin current, 2 A/div C: Inductor current, 2 A/div D: Output ripple voltage, 100 mV/div (AC-coupled) Horizontal: 5 μs/div Figure 19. Switching Waveforms of Step-Up Regulator of Figure 16 FLYBACK REGULATOR A Flyback regulator can produce single or multiple output voltages that are lower or greater than the input supply voltage. Figure 21 shows the LM1577/LM2577 used as a flyback regulator with positive and negative regulated outputs. Its operation is similar to a step-up regulator, except the output switch contols the primary current of a flyback transformer. Note that the primary and secondary windings are out of phase, so no current flows through secondary when current flows through the primary. This allows the primary to charge up the transformer core when the switch is on. When the switch turns off, the core discharges by sending current through the secondary, and this produces voltage at the outputs. The output voltages are controlled by adjusting the peak primary current, as described in the step-up regulator section. Voltage and current waveforms for this circuit are shown in Figure 20, and formulas for calculating them are given in Figure 22. FLYBACK REGULATOR DESIGN PROCEDURE 1. Transformer Selection A family of standardized flyback transformers is available for creating flyback regulators that produce dual output voltages, from ±10V to ±15V, as shown in Figure 21. Table 5lists these transformers with the input voltage, output voltages and maximum load current they are designed for. 2. Compensation Network (CC, RC) and Output Capacitor (COUT) Selection As explained in the Step-Up Regulator Design Procedure, CC, RC and COUT must be selected as a group. The following procedure is for a dual output flyback regulator with equal turns ratios for each secondary (i.e., both output voltages have the same magnitude). The equations can be used for a single output regulator by changing ∑ILOAD(max) to ILOAD(max) in the following equations. A. First, calculate the maximum value for RC. Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 23 LM1577, LM2577 SNOS658C – MAY 2004 – REVISED APRIL 2005 www.ti.com (20) Where ∑ILOAD(max) is the sum of the load current (magnitude) required from both outputs. Select a resistor less than or equal to this value, and no greater than 3 kΩ. B. Calculate the minimum value for ∑COUT (sum of COUT at both outputs) using the following two equations. (21) The larger of these two values must be used to ensure regulator stability. Figure 20. Flyback Regulator Waveforms T1 = Pulse Engineering, PE-65300 D1, D2 = 1N5821 Figure 21. LM1577-ADJ/LM2577-ADJ Flyback Regulator with ± Outputs Duty Cycle D (22) Primary Current Variation ΔIP (23) Peak Primary Current IP(PK) 24 Submit Documentation Feedback (24) Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658C – MAY 2004 – REVISED APRIL 2005 Switch Voltage when Off VSW(OFF) (25) − + Diode Reverse Voltage VR VOUT N (VIN VSAT) Average Diode Current ID(AVE) ILOAD Peak Diode Current ID(PK) (26) Short Circuit Diode Current (27) Power Dissipation of LM1577/LM2577 PD (28) Figure 22. Flyback Regulator Formulas C. Calculate the minimum value of CC (29) D. Calculate the maximum ESR of the +VOUT and −VOUT output capacitors in parallel. (30) This formula can also be used to calculate the maximum ESR of a single output regulator. At this point, refer to this same section in the Step-Up Regulator Design Procedurefor more information regarding the selection of COUT. 3. Output Voltage Selection This section is for applications using the LM1577-ADJ/LM2577-ADJ. Skip this section if the LM1577-12/LM257712 or LM1577-15/LM2577-15 is being used. With the LM1577-ADJ/LM2577-ADJ, the output voltage is given by VOUT = 1.23V (1 + R1/R2) (31) Resistors R1 and R2 divide the output voltage down so it can be compared with the LM1577-ADJ/LM2577-ADJ internal 1.23V reference. For a desired output voltage VOUT, select R1 and R2 so that (32) 4. Diode Selection The switching diode in a flyback converter must withstand the reverse voltage specified by the following equation. (33) A suitable diode must have a reverse voltage rating greater than this. In addition it must be rated for more than the average and peak diode currents listed in Figure 22. 5. Input Capacitor Selection The primary of a flyback transformer draws discontinuous pulses of current from the input supply. As a result, a flyback regulator generates more noise at the input supply than a step-up regulator, and this requires a larger bypass capacitor to decouple the LM1577/LM2577 VIN pin from this noise. For most applications, a low ESR, 1.0 μF cap will be sufficient, if it is connected very close to the VIN and Ground pins. Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 25 LM1577, LM2577 SNOS658C – MAY 2004 – REVISED APRIL 2005 www.ti.com Transformer Input Dual Maximum Type Voltage Output Output Voltage Current LP = 100 μH 5V ±10V 325 mA N=1 5V ±12V 275 mA 5V ±15V 225 mA 10V ±10V 700 mA 10V ±12V 575 mA LP = 200 μH 10V ±15V 500 mA N = 0.5 12V ±10V 800 mA 12V ±12V 700 mA 12V ±15V 575 mA LP = 250 μH 15V ±10V 900 mA N = 0.5 15V ±12V 825 mA 15V ±15V 700 mA 1 2 3 Table 5. Flyback Transformer Selection Guide Transformer Manufacturers' Part Numbers Type AIE Pulse Renco 1 326-0637 PE-65300 RL-2580 2 330-0202 PE-65301 RL-2581 3 330-0203 PE-65302 RL-2582 In addition to this bypass cap, a larger capacitor (≥ 47 μF) should be used where the flyback transformer connects to the input supply. This will attenuate noise which may interfere with other circuits connected to the same input supply voltage. 6. Snubber Circuit A “snubber” circuit is required when operating from input voltages greater than 10V, or when using a transformer with LP ≥ 200 μH. This circuit clamps a voltage spike from the transformer primary that occurs immediately after the output switch turns off. Without it, the switch voltage may exceed the 65V maximum rating. As shown in Figure 23, the snubber consists of a fast recovery diode, and a parallel RC. The RC values are selected for switch clamp voltage (VCLAMP) that is 5V to 10V greater than VSW(OFF). Use the following equations to calculate R and C; (34) Power dissipation (and power rating) of the resistor is; (35) The fast recovery diode must have a reverse voltage rating greater than VCLAMP. 26 Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658C – MAY 2004 – REVISED APRIL 2005 Figure 23. Snubber Circuit FLYBACK REGULATOR CIRCUIT EXAMPLE The circuit of Figure 24 produces ±15V (at 225 mA each) from a single 5V input. The output regulation of this circuit is shown in Figure 25 and Figure 27, while the load transient response is shown in Figure 26 and Figure 28. Switching waveforms seen in this circuit are shown in Figure 29. T1 = Pulse Engineering, PE-65300 D1, D2 = 1N5821 Figure 24. Flyback Regulator Easily Provides Dual Outputs Figure 25. Line Regulation (Typical) of Flyback Regulator of Figure 24, +15V Output Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 27 LM1577, LM2577 SNOS658C – MAY 2004 – REVISED APRIL 2005 www.ti.com A: Output Voltage Change, 100 mV/div B: Output Current, 100 mA/div Horizontal: 10 ms/div Figure 26. Load Transient Response of Flyback Regulator of Figure 24, +15V Output Figure 27. Line Regulation (Typical) of Flyback Regulator of Figure 24, −15V Output 28 Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658C – MAY 2004 – REVISED APRIL 2005 A: Output Voltage Change, 100 mV/div B: Output Current, 100 mA/div Horizontal: 10 ms/div Figure 28. Load Transient Response of Flyback Regulator of Figure 24, −15V Output A: Switch pin voltage, 20 V/div B: Primary current, 2 A/div C: +15V Secondary current, 1 A/div D: +15V Output ripple voltage, 100 mV/div Horizontal: 5 μs/div Figure 29. Switching Waveforms of Flyback Regulator of Figure 24, Each Output Loaded with 60Ω Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 29 PACKAGE OPTION ADDENDUM www.ti.com 17-Nov-2012 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Qty Drawing Eco Plan Lead/Ball Finish (2) MSL Peak Temp Samples (3) (Requires Login) LM2577M-ADJ ACTIVE SOIC DW 24 30 TBD CU SNPB Level-3-260C-168 HR LM2577M-ADJ/NOPB ACTIVE SOIC DW 24 30 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR LM2577N-ADJ ACTIVE PDIP NBG 16 20 TBD CU SNPB Level-1-NA-UNLIM LM2577N-ADJ/NOPB ACTIVE PDIP NBG 16 20 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2577S-12 ACTIVE DDPAK/ TO-263 KTT 5 45 TBD CU SNPB Level-3-235C-168 HR LM2577S-12/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR LM2577S-ADJ ACTIVE DDPAK/ TO-263 KTT 5 45 TBD CU SNPB Level-3-235C-168 HR LM2577S-ADJ/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR LM2577SX-12 ACTIVE DDPAK/ TO-263 KTT 5 500 TBD CU SNPB Level-3-235C-168 HR LM2577SX-12/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR LM2577SX-ADJ ACTIVE DDPAK/ TO-263 KTT 5 500 TBD CU SNPB Level-3-235C-168 HR LM2577SX-ADJ/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR LM2577T-12 ACTIVE TO-220 KC 5 45 TBD CU SNPB Level-1-NA-UNLIM LM2577T-12/LB03 ACTIVE TO-220 NDH 5 45 TBD CU SNPB Level-1-NA-UNLIM LM2577T-12/LF03 ACTIVE TO-220 NDH 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2577T-12/NOPB ACTIVE TO-220 KC 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2577T-15 ACTIVE TO-220 KC 5 45 TBD CU SNPB Level-1-NA-UNLIM LM2577T-15/LB03 ACTIVE TO-220 NDH 5 45 TBD CU SNPB Level-1-NA-UNLIM LM2577T-15/NOPB ACTIVE TO-220 KC 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2577T-ADJ ACTIVE TO-220 KC 5 45 TBD CU SNPB Level-1-NA-UNLIM Addendum-Page 1 PACKAGE OPTION ADDENDUM www.ti.com 17-Nov-2012 Orderable Device Status (1) Package Type Package Pins Package Qty Drawing Eco Plan Lead/Ball Finish (2) MSL Peak Temp Samples (3) (Requires Login) LM2577T-ADJ/LB02 ACTIVE 5 45 TBD CU SNPB Level-1-NA-UNLIM LM2577T-ADJ/LB03 ACTIVE TO-220 NDH 5 45 TBD CU SNPB Level-1-NA-UNLIM LM2577T-ADJ/LF03 ACTIVE TO-220 NDH 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2577T-ADJ/NOPB ACTIVE TO-220 KC 5 45 Pb-Free (RoHS Exempt) CU SN Level-1-NA-UNLIM (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. 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. (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. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. Addendum-Page 2 PACKAGE MATERIALS INFORMATION www.ti.com 17-Nov-2012 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 LM2577SX-12 DDPAK/ TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM2577SX-12/NOPB DDPAK/ TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM2577SX-ADJ DDPAK/ TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM2577SX-ADJ/NOPB DDPAK/ TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 17-Nov-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2577SX-12 DDPAK/TO-263 KTT 5 500 358.0 343.0 63.0 LM2577SX-12/NOPB DDPAK/TO-263 KTT 5 500 358.0 343.0 63.0 LM2577SX-ADJ DDPAK/TO-263 KTT 5 500 358.0 343.0 63.0 LM2577SX-ADJ/NOPB DDPAK/TO-263 KTT 5 500 358.0 343.0 63.0 Pack Materials-Page 2 MECHANICAL DATA NDH0005D www.ti.com MECHANICAL DATA NBG0016G www.ti.com MECHANICAL DATA KTT0005B TS5B (Rev D) BOTTOM SIDE OF PACKAGE www.ti.com 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. 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