LM1577, LM2577 www.ti.com SNOS658D - JUNE 1999 - REVISED APRIL 2013 LM1577/LM2577 SIMPLE SWITCHER(R) Step-Up Voltage Regulator Check for Samples: LM1577, LM2577 FEATURES 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. 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 TYPICAL APPLICATIONS * * * Simple Boost Regulator Flyback and Forward Regulators Multiple-output Regulator 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 Figure 1. 5-Lead (Straight Leads) TO-220 (T) - Top View See Package Number KC Figure 2. 5-Lead (Bent, Staggered Leads) TO-220 (T) - Top View See Package Number NDH0005D 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 (c) 1999-2013, Texas Instruments Incorporated LM1577, LM2577 SNOS658D - JUNE 1999 - REVISED APRIL 2013 www.ti.com *No Internal Connection *No internal Connection Figure 3. 16-Lead PDIP (N) - Top View See Package Number NBG0016G Figure 4. 24-Lead SOIC Package (M) - Top View See Package Number DW Figure 5. 5-Lead DDPAK/TO-263 (S) SFM Package - Figure 6. 5-Lead DDPAK/TO-263 (S) SFM Package - Top View Side View See Package Number KTT0005B Figure 7. 4-Lead TO-220 (K) - Bottom View See Package Number NEB0005B 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. 2 Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658D - JUNE 1999 - REVISED APRIL 2013 Absolute Maximum Ratings (1) (2) Supply Voltage 45V Output Switch Voltage 65V Output Switch Current (3) 6.0A Power Dissipation Internally Limited -65C to +150C Storage Temperature Range Lead Temperature Soldering, 10 sec. 260C Maximum Junction Temperature Minimum ESD Rating (1) (2) (3) 150C C = 100 pF, R = 1.5 k 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 ensured under these conditions. For ensured specifications and test conditions, see the Electrical Characteristics. If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications. 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 LM1577 -55C TJ +150C LM2577 -40C TJ +125C Electrical Characteristics--LM1577-12, LM2577-12 Specifications with standard type face are for TJ = 25C, 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 Limit (1) (2) LM2577-12 Limit (3) Units (Limits) SYSTEM PARAMETERS Circuit of Figure 29 (4) VOUT Output Voltage Line Regulation (1) Load Regulation (2) Efficiency VIN = 5V to 10V ILOAD = 100 mA to 800 mA (1) 12.0 VIN = 3.5V to 10V ILOAD = 300 mA 20 VIN = 5V ILOAD = 100 mA to 800 mA 20 VIN = 5V, ILOAD = 800 mA 80 VFEEDBACK = 14V (Switch Off) 7.5 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) 50/100 50/100 mV(max) mV mV % DEVICE PARAMETERS IS Input Supply Current mA 10.0/14.0 ISWITCH = 2.0A 25 VCOMP = 2.0V (Max Duty Cycle) (1) (2) (3) (4) 10.0/14.0 mA(max) mA 50/85 50/85 mA(max) All limits ensured 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 ensured 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 ensured 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 (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 3 LM1577, LM2577 SNOS658D - JUNE 1999 - REVISED APRIL 2013 www.ti.com Electrical Characteristics--LM1577-12, LM2577-12 (continued) Specifications with standard type face are for TJ = 25C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V, and ISWITCH = 0. Symbol VUV fO VREF Parameter Input Supply Undervoltage Lockout ISWITCH = 100 mA Oscillator Frequency Measured at Switch Pin ISWITCH = 100 mA Output Reference Voltage Output Reference Voltage Line Regulator RFB Feedback Pin Input Resistance GM Error Amp Transconductance AVOL ISS D Conditions (5) 4 Units (Limits) 2.70/2.65 2.70/2.65 V(min) 3.10/3.15 3.10/3.15 V(max) V 52 kHz 48/42 48/42 kHz(min) 56/62 56/62 kHz(max) 12 VIN = 3.5V to 40V 7 mV 9.7 k 370 mho ICOMP = -30 A to +30 A VCOMP = 1.0V V VCOMP = 1.1V to 1.9V RCOMP = 1.0 M (5) 80 Error Amplifier Output Swing Upper Limit VFEEDBACK = 10.0V 2.4 Lower Limit VFEEDBACK = 15.0V 0.3 Error Amplifier Output Current VFEEDBACK = 10.0V to 15.0V VCOMP = 1.0V Soft Start Current VFEEDBACK = 10.0V VCOMP = 0V VCOMP = 1.5V ISWITCH = 100 mA 11.76/11.64 11.76/11.64 V(min) 12.24/12.36 12.24/12.36 V(max) 225/145 225/145 mho(min) 515/615 515/615 mho(max) 50/25 50/25 V/V(min) 2.2/2.0 2.2/2.0 V(min) V/V V V 0.40/0.55 0.40/0.55 V(max) 130/90 130/90 A(min) 300/400 300/400 A(max) 2.5/1.5 2.5/1.5 A(min) 7.5/9.5 7.5/9.5 A(max) 93/90 93/90 %(min) A 200 A 5.0 95 % 12.5 Switch Leakage Current VSWITCH = 65V VFEEDBACK = 15V (Switch Off) 10 Switch Saturation Voltage ISWITCH = 2.0A VCOMP = 2.0V (Max Duty Cycle) 0.5 NPN Switch Current Limit LM2577-12 Limit (3) Measured at Feedback Pin VIN = 3.5V to 40V VCOMP = 1.0V Switch Transconductance VSAT LM1577-12 Limit (1) (2) 2.90 Error Amp Voltage Gain Maximum Duty Cycle IL Typical A/V A 300/600 300/600 A(max) V 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) 4.5 A A 1.0 M 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 M, resulting in AVOL that is typically twice the ensured minimum limit. Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658D - JUNE 1999 - REVISED APRIL 2013 Electrical Characteristics--LM1577-15, LM2577-15 Specifications with standard type face are for TJ = 25C, 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 Limit (1) (2) LM2577-15 Limit (3) Units (Limits) 14.50/14.25 14.50/14.25 V(min) 15.50/15.75 15.50/15.75 V(max) 50/100 50/100 mV mV(max) 50/100 50/100 mV mV(max) SYSTEM PARAMETERS Circuit of Figure 30 (4) VOUT Output Voltage VIN = 5V to 12V ILOAD = 100 mA to 600 mA 15.0 (1) Line Regulation VIN = 3.5V to 12V ILOAD = 300 mA 20 VIN = 5V ILOAD = 100 mA to 600 mA 20 VIN = 5V, ILOAD = 600 mA 80 VFEEDBACK = 18.0V (Switch Off) 7.5 ISWITCH = 2.0A VCOMP = 2.0V (Max Duty Cycle) 25 Input Supply Undervoltage Lockout ISWITCH = 100 mA 2.90 Oscillator Frequency Measured at Switch Pin ISWITCH = 100 mA Load Regulation Efficiency V % DEVICE PARAMETERS IS Input Supply Current VUV fO VREF Output Reference Voltage Output Reference Voltage Line Regulation RFB Feedback Pin Input Voltage Line Regulator GM Error Amp Transconductance AVOL (1) (2) (3) (4) (5) Error Amp Voltage Gain mA 10.0/14.0 10.0/14.0 mA(max) mA 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) V 52 kHz 48/42 48/42 kHz(min) 56/62 56/62 kHz(max) Measured at Feedback Pin VIN = 3.5V to 40V VCOMP = 1.0V 15 VIN = 3.5V to 40V 10 mV 12.2 k 300 mho ICOMP = -30 A to +30 A VCOMP = 1.0V VCOMP = 1.1V to 1.9V RCOMP = 1.0 M (5) V 14.70/14.55 14.70/14.55 V(min) 15.30/15.45 15.30/15.45 V(max) 170/110 170/110 mho(min) 420/500 420/500 mho(max) 40/20 40/20 V/V(min) 65 V/V All limits ensured 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 ensured 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 ensured 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 M 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 M, resulting in AVOL that is typically twice the ensured minimum limit. Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 5 LM1577, LM2577 SNOS658D - JUNE 1999 - REVISED APRIL 2013 www.ti.com Electrical Characteristics--LM1577-15, LM2577-15 (continued) Specifications with standard type face are for TJ = 25C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V, and ISWITCH = 0. Symbol Parameter Error Amplifier Output Swing Error Amp Output Current ISS D Soft Start Current Maximum Duty Cycle Conditions Upper Limit VFEEDBACK = 12.0V 2.4 Lower Limit VFEEDBACK = 18.0V 0.3 VFEEDBACK = 12.0V to 18.0V VCOMP = 1.0V VFEEDBACK = 12.0V VCOMP = 0V VCOMP = 1.5V ISWITCH = 100 mA Switch Transconductance IL VSAT 6 Typical LM1577-15 Limit (1) (2) LM2577-15 Limit (3) Units (Limits) 2.2/2.0 2.2/2.0 V(min) 0.4/0.55 0.40/0.55 V(max) 130/90 130/90 A(min) 300/400 300/400 A(max) 2.5/1.5 2.5/1.5 A(min) 7.5/9.5 7.5/9.5 A(max) 93/90 93/90 %(min) V V A 200 A 5.0 95 % 12.5 Switch Leakage Current VSWITCH = 65V VFEEDBACK = 18.0V (Switch Off) 10 Switch Saturation Voltage ISWITCH = 2.0A VCOMP = 2.0V (Max Duty Cycle) 0.5 NPN Switch Current Limit VCOMP = 2.0V 4.3 A/V A 300/600 Submit Documentation Feedback 300/600 A(max) V 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) A Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658D - JUNE 1999 - REVISED APRIL 2013 Electrical Characteristics--LM1577-ADJ, LM2577-ADJ Specifications with standard type face are for TJ = 25C, 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 SYSTEM PARAMETERS Circuit of Figure 31 VOUT VOUT/VIN VOUT/ILOA Output Voltage Line Regulation LM1577-ADJ Limit (1) (2) LM2577-ADJ Limit (3) Units (Limits) 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) (4) VIN = 5V to 10V ILOAD = 100 mA to 800 mA (1) 12.0 VIN = 3.5V to 10V ILOAD = 300 mA 20 Load Regulation VIN = 5V ILOAD = 100 mA to 800 mA 20 Efficiency VIN = 5V, ILOAD = 800 mA 80 VFEEDBACK = 1.5V (Switch Off) 7.5 D Typical V mV mV 50/100 50/100 mV(max) % DEVICE PARAMETERS IS Input Supply Current ISWITCH = 2.0A VCOMP = 2.0V (Max Duty Cycle) VUV Input Supply Undervoltage Lockout fO Oscillator Frequency VREF ISWITCH = 100 mA Measured at Switch Pin ISWITCH = 100 mA Reference Voltage Line Regulation VIN = 3.5V to 40V 0.5 IB Error Amp Input Bias Current VCOMP = 1.0V 100 Error Amp Transconductance ICOMP = -30 A to +30 A VCOMP = 1.0V 3700 Error Amp Voltage Gain VCOMP = 1.1V to 1.9V RCOMP = 1.0 M (5) 800 Error Amplifier Output Swing Upper Limit VFEEDBACK = 1.0V 2.4 Lower Limit VFEEDBACK = 1.5V 0.3 (2) (3) (4) (5) 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) 1.214/1.206 1.214/1.206 V(min) 1.246/1.254 1.246/1.254 V(max) mA V 52 VREF/VIN (1) mA(max) 2.90 Measured at Feedback Pin VIN = 3.5V to 40V VCOMP = 1.0V AVOL 10.0/14.0 25 Reference Voltage GM mA 10.0/14.0 kHz V 1.230 mV nA 300/800 300/800 nA(max) 2400/1600 2400/1600 mho(min) 4800/5800 4800/5800 mho(max) mho V/V 500/250 500/250 V/V(min) 2.2/2.0 2.2/2.0 V(min) 0.40/0.55 0.40/0.55 V(max) V V All limits ensured 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 ensured 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 ensured 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 M 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 M, resulting in AVOL that is typically twice the ensured minimum limit. Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 7 LM1577, LM2577 SNOS658D - JUNE 1999 - REVISED APRIL 2013 www.ti.com Electrical Characteristics--LM1577-ADJ, LM2577-ADJ (continued) Specifications with standard type face are for TJ = 25C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V, VFEEDBACK = VREF, and ISWITCH = 0. Symbol ISS D Parameter Conditions Error Amp Output Current VFEEDBACK = 1.0V to 1.5V VCOMP = 1.0V Soft Start Current VFEEDBACK = 1.0V VCOMP = 0V Maximum Duty Cycle Typical LM1577-ADJ Limit (1) (2) LM2577-ADJ Limit (3) Units (Limits) 130/90 130/90 A(min) 300/400 300/400 A(max) A 200 A 5.0 VCOMP = 1.5V ISWITCH = 100 mA 2.5/1.5 2.5/1.5 A(min) 7.5/9.5 7.5/9.5 A(max) 95 % 93/90 ISWITCH/VC Switch Transconductance OMP 93/90 %(min) 12.5 A/V A IL Switch Leakage Current VSWITCH = 65V VFEEDBACK = 1.5V (Switch Off) 10 VSAT Switch Saturation Voltage ISWITCH = 2.0A VCOMP = 2.0V (Max Duty Cycle) 0.5 NPN Switch Current Limit VCOMP = 2.0V 4.3 300/600 300/600 A(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) V A THERMAL PARAMETERS (All Versions) JA JC Thermal Resistance K Package, Junction to Ambient K Package, Junction to Case 35 1.5 JA JC T Package, Junction to Ambient T Package, Junction to Case 65 2 JA N Package, Junction to Ambient (6) 85 JA M Package, Junction to Ambient (6) 100 S Package, Junction to Ambient (7) 37 JA (6) (7) 8 C/W 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 DDPAK/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, JA is 50C/W; with 1 square inch of copper area, JA is 37C/W; and with 1.6 or more square inches of copper area, JA is 32C/W. Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658D - JUNE 1999 - REVISED APRIL 2013 Typical Performance Characteristics Reference Voltage vs Temperature Reference Voltage vs Temperature Figure 8. Figure 9. Reference Voltage vs Temperature Reference Voltage vs Supply Voltage Figure 10. Figure 11. Reference Voltage vs Supply Voltage Reference Voltage vs Supply Voltage Figure 12. Figure 13. Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 9 LM1577, LM2577 SNOS658D - JUNE 1999 - REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 10 Error Amp Transconductance vs Temperature Error Amp Transconductance vs Temperature Figure 14. Figure 15. Error Amp Transconductance vs Temperature Error Amp Voltage Gain vs Temperature Figure 16. Figure 17. Error Amp Voltage Gain vs Temperature Error Amp Voltage Gain vs Temperature Figure 18. Figure 19. Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658D - JUNE 1999 - REVISED APRIL 2013 Typical Performance Characteristics (continued) Quiescent Current vs Temperature Quiescent Current vs Switch Current Figure 20. Figure 21. Current Limit vs Temperature Current Limit Response Time vs Overdrive Figure 22. Figure 23. Switch Saturation Voltage vs Switch Current Switch Transconductance vs Temperature Figure 24. Figure 25. Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 11 LM1577, LM2577 SNOS658D - JUNE 1999 - REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) Feedback Pin Bias Current vs Temperature Oscillator Frequency vs Temperature Figure 26. Figure 27. Maximum Power Dissipation (DDPAK/TO-263) (1) Figure 28. (1) 12 If the DDPAK/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, JA is 50C/W; with 1 square inch of copper area, JA is 37C/W; and with 1.6 or more square inches of copper area, JA is 32C/W. Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658D - JUNE 1999 - REVISED APRIL 2013 LM1577-12, LM2577-12 TEST CIRCUIT L = 415-0930 (AIE) D = any manufacturer COUT = Sprague Type 673D Electrolytic 680 F, 20V Note: Pin numbers shown are for TO-220 (T) package Figure 29. Circuit Used to Specify System Parameters for 12V Versions LM1577-15, LM2577-15 Test Circuit L = 415-0930 (AIE) D = any manufacturer COUT = Sprague Type 673D Electrolytic 680 F, 20V Note: Pin numbers shown are for TO-220 (T) package Figure 30. Circuit Used to Specify System Parameters for 15V Versions Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 13 LM1577, LM2577 SNOS658D - JUNE 1999 - REVISED APRIL 2013 www.ti.com LM1577-ADJ, LM2577-ADJ Test Circuit L = 415-0930 (AIE) D = any manufacturer COUT = Sprague Type 673D Electrolytic 680 F, 20V R1 = 48.7k in series with 511 (1%) R2 = 5.62k (1%) Note: Pin numbers shown are for TO-220 (T) package Figure 31. Circuit Used to Specify System Parameters for ADJ Versions Application Hints Note: Pin numbers shown are for TO-220 (T) package *Resistors are internal to LM1577/LM2577 for 12V and 15V versions. Figure 32. LM1577/LM2577 Block Diagram and Boost Regulator Application 14 Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658D - JUNE 1999 - REVISED APRIL 2013 STEP-UP (BOOST) REGULATOR Figure 32 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 33, and formulas for calculating them are given in Table 1. Figure 33. Step-Up Regulator Waveforms Table 1. Step-Up Regulator Formulas (1) Duty Cycle Average Inductor Current Inductor Current Ripple Peak Inductor Current Peak Switch Current Switch Voltage When Off D IIND(AVE) IIND IIND(PK) ISW(PK) VSW(OFF) VOUT + VF Diode Reverse Voltage VR VOUT - VSAT Average Diode Current ID(AVE) ILOAD Peak Diode Current ID(PK) Power Dissipation of LM1577/2577 (1) PD VF = Forward Biased Diode Voltage ILOAD = Output Load Current Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 15 LM1577, LM2577 SNOS658D - JUNE 1999 - REVISED APRIL 2013 www.ti.com STEP-UP REGULATOR DESIGN PROCEDURE The following design procedure can be used to select the appropriate external components for the circuit in Figure 32, 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. where * * VOUT 60V VOUT 10 x VIN(min) (3) 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 From Figure 34 (for 12V output) or Figure 35 (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): (4) where VF = 0.5V for Schottky diodes and 0.8V for fast recovery diodes (typically); E *T, the product of volts x time that charges the inductor: (5) IIND,DC, the average inductor current under full load; (6) B. Identify Inductor Value: 1. From Figure 36, 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*s (L) or 250 V*s (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: (7) 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. 16 Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658D - JUNE 1999 - REVISED APRIL 2013 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 34. LM2577-12 Inductor Selection Guide Figure 35. LM2577-15 Inductor Selection Guide Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 17 LM1577, LM2577 SNOS658D - JUNE 1999 - REVISED APRIL 2013 www.ti.com Note: These charts assume that the inductor ripple current 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 36. LM1577-ADJ/LM2577-ADJ Inductor Selection Graph C. Select an inductor from 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 (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658D - JUNE 1999 - REVISED APRIL 2013 Table 2. Table of Standardized Inductors and Manufacturer's Part Numbers (1) Inductor (1) 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 Schott Corp., (612) 475-1173 1000 Parkers Lake Rd., Wayzata, MN 55391 Pulse Engineering, (619) 268-2400 P.O. Box 12235, San Diego, CA 92112 Renco Electronics Inc., (516) 586-5566 60 Jeffryn Blvd. East, Deer Park, NY 11729 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 ensure 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 39). A. First, calculate the maximum value for RC. (8) Select a resistor less than or equal to this value, and it should also be no greater than 3 k. B. Calculate the minimum value for COUT using the following two equations. (9) The larger of these two values is the minimum value that ensures stability. C. Calculate the minimum value of CC . (10) Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 19 LM1577, LM2577 SNOS658D - JUNE 1999 - REVISED APRIL 2013 www.ti.com 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 F. 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. 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 (11) 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. (12) 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 -20C. In general, low values of ESR are achieved by using large value capacitors (C 470 F), 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) (13) 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 (14) 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 F capacitor (leads as short as possible) is normally sufficient. 20 Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658D - JUNE 1999 - REVISED APRIL 2013 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 F) 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 37), 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 38 and Figure 39. The switching waveforms observed during the operation of this circuit are shown in Figure 40. Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 21 LM1577, LM2577 SNOS658D - JUNE 1999 - REVISED APRIL 2013 www.ti.com Note: Pin numbers shown are for TO-220 (T) package. Figure 37. Step-up Regulator Delivers 12V from a 5V Input Figure 38. Line Regulation (Typical) of Step-Up Regulator of Figure 37 A: Output Voltage Change, 100 mV/div. (AC-coupled) B: Load current, 0.2 A/div Horizontal: 5 ms/div Figure 39. Load Transient Response of Step-Up Regulator of Figure 37 22 Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658D - JUNE 1999 - REVISED APRIL 2013 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 s/div Figure 40. Switching Waveforms of Step-Up Regulator of Figure 37 FLYBACK REGULATOR A Flyback regulator can produce single or multiple output voltages that are lower or greater than the input supply voltage. Figure 42 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 (BOOST) REGULATOR section. Voltage and current waveforms for this circuit are shown in Figure 41, and formulas for calculating them are given in Table 5. 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 42. Table 6 lists 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 (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 23 LM1577, LM2577 SNOS658D - JUNE 1999 - REVISED APRIL 2013 www.ti.com (15) 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 k. B. Calculate the minimum value for COUT (sum of COUT at both outputs) using the following two equations. (16) The larger of these two values must be used to ensure regulator stability. Figure 41. Flyback Regulator Waveforms T1 = Pulse Engineering, PE-65300 D1, D2 = 1N5821 Figure 42. LM1577-ADJ/LM2577-ADJ Flyback Regulator with Outputs Table 5. Flyback Regulator Formulas Duty Cycle D (17) Primary Current Variation IP 24 Submit Documentation Feedback (18) Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658D - JUNE 1999 - REVISED APRIL 2013 Table 5. Flyback Regulator Formulas (continued) Peak Primary Current IP(PK) Switch Voltage when Off (19) VSW(OFF) (20) Diode Reverse Voltage VR VOUT+ N (VIN- VSAT) Average Diode Current ID(AVE) ILOAD Peak Diode Current ID(PK) (21) Short Circuit Diode Current (22) Power Dissipation of LM1577/LM2577 PD (23) C. Calculate the minimum value of CC (24) D. Calculate the maximum ESR of the +VOUT and -VOUT output capacitors in parallel. (25) 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 PROCEDURE section for 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) (26) 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 (27) 4. Diode Selection The switching diode in a flyback converter must withstand the reverse voltage specified by the following equation. (28) 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 Table 5. 5. Input Capacitor Selection Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 25 LM1577, LM2577 SNOS658D - JUNE 1999 - REVISED APRIL 2013 www.ti.com 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 F cap will be sufficient, if it is connected very close to the VIN and Ground pins. Transformer Input Dual Maximum Type Voltage Output Output Voltage Current LP = 100 H 5V 10V 325 mA N=1 5V 12V 275 mA 5V 15V 225 mA 10V 10V 700 mA 10V 12V 575 mA LP = 200 H 10V 15V 500 mA N = 0.5 12V 10V 800 mA 12V 12V 700 mA 12V 15V 575 mA LP = 250 H 15V 10V 900 mA N = 0.5 15V 12V 825 mA 15V 15V 700 mA 1 2 3 Table 6. 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 F) 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 H. 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 43, 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; (29) Power dissipation (and power rating) of the resistor is; (30) The fast recovery diode must have a reverse voltage rating greater than VCLAMP. 26 Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658D - JUNE 1999 - REVISED APRIL 2013 Figure 43. Snubber Circuit FLYBACK REGULATOR CIRCUIT EXAMPLE The circuit of Figure 44 produces 15V (at 225 mA each) from a single 5V input. The output regulation of this circuit is shown in Figure 45 and Figure 47, while the load transient response is shown in Figure 46 and Figure 48. Switching waveforms seen in this circuit are shown in Figure 49. T1 = Pulse Engineering, PE-65300 D1, D2 = 1N5821 Figure 44. Flyback Regulator Easily Provides Dual Outputs Figure 45. Line Regulation (Typical) of Flyback Regulator of Figure 44, +15V Output Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 27 LM1577, LM2577 SNOS658D - JUNE 1999 - REVISED APRIL 2013 www.ti.com A: Output Voltage Change, 100 mV/div B: Output Current, 100 mA/div Horizontal: 10 ms/div Figure 46. Load Transient Response of Flyback Regulator of Figure 44, +15V Output Figure 47. Line Regulation (Typical) of Flyback Regulator of Figure 44, -15V Output 28 Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 LM1577, LM2577 www.ti.com SNOS658D - JUNE 1999 - REVISED APRIL 2013 A: Output Voltage Change, 100 mV/div B: Output Current, 100 mA/div Horizontal: 10 ms/div Figure 48. Load Transient Response of Flyback Regulator of Figure 44, -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 s/div Figure 49. Switching Waveforms of Flyback Regulator of Figure 44, Each Output Loaded with 60 Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 29 LM1577, LM2577 SNOS658D - JUNE 1999 - REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision C (April 2013) to Revision D * 30 Page Changed layout of National Data Sheet to TI format .......................................................................................................... 29 Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM1577 LM2577 PACKAGE OPTION ADDENDUM www.ti.com 9-Jun-2020 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) LM2577S-ADJ NRND DDPAK/ TO-263 KTT 5 45 TBD Call TI Call TI -40 to 125 LM2577S -ADJ P+ LM2577S-ADJ/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Green (RoHS & no Sb/Br) SN Level-3-245C-168 HR -40 to 125 LM2577S -ADJ P+ LM2577SX-ADJ/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Green (RoHS & no Sb/Br) SN Level-3-245C-168 HR -40 to 125 LM2577S -ADJ P+ LM2577T-ADJ NRND TO-220 KC 5 45 TBD Call TI Call TI -40 to 125 LM2577T -ADJ P+ LM2577T-ADJ/LB03 NRND TO-220 NDH 5 45 TBD Call TI Call TI LM2577T -ADJ P+ LM2577T-ADJ/LF03 ACTIVE TO-220 NDH 5 45 Green (RoHS & no Sb/Br) SN Level-1-NA-UNLIM LM2577T -ADJ P+ LM2577T-ADJ/NOPB ACTIVE TO-220 KC 5 45 Green (RoHS & no Sb/Br) SN Level-1-NA-UNLIM -40 to 125 LM2577T -ADJ P+ (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) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based flame retardants must also meet the <=1000ppm threshold requirement. (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com 9-Jun-2020 (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. 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 15-Sep-2018 TAPE AND REEL INFORMATION *All dimensions are nominal Device LM2577SX-ADJ/NOPB Package Package Pins Type Drawing SPQ DDPAK/ TO-263 500 KTT 5 Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 330.0 24.4 Pack Materials-Page 1 10.75 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 14.85 5.0 16.0 24.0 Q2 PACKAGE MATERIALS INFORMATION www.ti.com 15-Sep-2018 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2577SX-ADJ/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 Pack Materials-Page 2 MECHANICAL DATA NEB0005B www.ti.com PACKAGE OUTLINE KC0005A TO-220 - 16.51 mm max height SCALE 0.850 TO-220 4.83 4.06 10.67 9.65 3.05 2.54 B 1.40 1.14 A 6.86 5.69 3.71-3.96 8.89 6.86 (6.275) 12.88 10.08 OPTIONAL CHAMFER 16.51 MAX 2X (R1) OPTIONAL 9.25 7.67 C (4.25) PIN 1 ID (OPTIONAL) NOTE 3 14.73 12.29 1 5X 0.25 5 0.61 0.30 1.02 0.64 C A B 3.05 2.03 4X 1.7 6.8 1 5 4215009/A 01/2017 NOTES: 1. All controlling linear dimensions are in inches. Dimensions in brackets are in millimeters. Any dimension in brackets or parenthesis are for reference only. Dimensioning and tolerancing per ASME Y14.5M. 2. This drawing is subject to change without notice. 3. Shape may vary per different assembly sites. www.ti.com EXAMPLE BOARD LAYOUT KC0005A TO-220 - 16.51 mm max height TO-220 4X (1.45) PKG 0.07 MAX ALL AROUND 0.07 MAX ALL AROUND METAL TYP (1.45) PKG (2) 4X (2) 1 (R0.05) TYP 5X ( 1.2) SOLDER MASK OPENING, TYP (1.7) TYP 5 FULL R TYP (6.8) LAND PATTERN NON-SOLDER MASK DEFINED SCALE:12X 4215009/A 01/2017 www.ti.com MECHANICAL DATA NDH0005D www.ti.com MECHANICAL DATA KTT0005B TS5B (Rev D) BOTTOM SIDE OF PACKAGE www.ti.com IMPORTANT NOTICE AND DISCLAIMER TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATASHEETS), DESIGN RESOURCES (INCLUDING REFERENCE DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES "AS IS" AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS. 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