100-kHz CURRENT-MODE SIMPLE STEP-UP/FLYBACK SWITCHING REGULATOR

www.DataSheet4U.com TL3577 100-kHz CURRENT-MODE SIMPLE STEP-UP/FLYBACK SWITCHING REGULATOR www.ti.com SLVS633 – OCTOBER 2006 FEATURES • • • • • Few External Components Required (As Few As Six) Current Limit, Undervoltage Lockout, and Thermal Shutdown Wide Input Voltage Range: 3 V to 40 V 100-kHz Internal Oscillator Allows for Use of Small Magnetics Current-Mode Operation for Faster Transient Response, Line Regulation, and Cycle-by-Cycle Current Limiting Soft-Start Capability Provides Controlled Startup Current Improved Replacement for LM2577 Series APPLICATIONS • • • • Simple Boost Converter Flyback Converters, Single/Multiple Outputs SEPIC Converter With VIN Higher or Lower Than Output Voltage Transformer-Coupled Forward Converters KTT (TO-263) PACKAGE (TOP VIEW) 5 4 3 2 1 • • VIN SWITCH GND FEEDBACK COMP DESCRIPTION/ORDERING INFORMATION The TL3577 series are easy-to-use devices that incorporate all the active circuitry required to implement either step-up (boost), flyback, forward converter, or SEPIC converter switching regulators. The internal 3-A 65-V switch allows the TL3577 to provide an output voltage of up to 60 V as a simple boost regulator; higher output voltages can be achieved with the TL3577 configured as a flyback or forward converter. Requiring few external components, The TL3577 features a wide input voltage range of 3 V to 40 V and offers an adjustable output voltage. Basic protection features include undervoltage lockout, thermal protection, and soft start, which is provided to reduce input current during startup. Current-mode control provides cycle-by-cycle current limiting, as well as faster line and load regulation. The internal 100-kHz oscillator allows for use of smaller magnetics and filter components, when compared with similar regulators running at 52 kHz. A standard series of inductors and capacitors optimized for use with these regulators is available from several manufacturers and are listed in this data sheet. The TL3577 is characterized for operation over the virtual junction temperature range of –40°C to 125°C. ORDERING INFORMATION TJ –40°C to 125°C (1) VO (NOM) ADJ PACKAGE (1) TO-263 – KTT Reel of 500 ORDERABLE PART NUMBER TL3577-ADJIKTTR TOP-SIDE MARKING TL3577ADJI Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. 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. 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. GND Copyright © 2006, Texas Instruments Incorporated TL3577 100-kHz CURRENT-MODE SIMPLE STEP-UP/FLYBACK SWITCHING REGULATOR SLVS633 – OCTOBER 2006 www.ti.com FUNCTIONAL BLOCK DIAGRAM VIN SWITCH Current Limit, Thermal Limit, and Undervoltage Shutdown 2.5-V Regulator Logic Driver Stage 3-A 65-V NPN Switch 100-kHz Oscillator Comparator Corrective Ramp Voltage + S + CurrentSense Voltage Amp FEEDBACK Soft Start Error Amplifier 1.23-V Reference CurrentSense Resistor COMP GND 2 Submit Documentation Feedback www.ti.com TL3577 100-kHz CURRENT-MODE SIMPLE STEP-UP/FLYBACK SWITCHING REGULATOR SLVS633 – OCTOBER 2006 (1) Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted) MIN VIN VSW ISW TJ Tstg TJ (1) Supply voltage Output SWITCH voltage Output SWITCH current Maximum junction temperature Storage temperature range Junction temperature –65 MAX 45 65 6 150 150 150 UNIT V V A °C °C °C Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Package Thermal Data (1) PACKAGE TO-263 (KTT) (1) BOARD High K, JESD 51-5 θJA 31.8 θJC 35.0 θJCB 1.13 Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability. Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted) MIN VIN VSW ISW TJ Supply voltage Output SWITCH voltage Output SWITCH current Operating virtual junction temperature –40 3 0 MAX 40 60 3 125 UNIT V V A °C Submit Documentation Feedback 3 TL3577 100-kHz CURRENT-MODE SIMPLE STEP-UP/FLYBACK SWITCHING REGULATOR SLVS633 – OCTOBER 2006 www.ti.com Electrical Characteristics VIN = 5 V, VFEEDBACK = VREF, ISWITCH = 0 (unless otherwise noted) PARAMETER VOUT DVOUT DVIN DVOUT DILOAD TEST CONDITIONS VIN = 5 V to 10 V, ILOAD = 100 mA to 800 mA, See Figure 1 VIN = 3.5 V to 10 V, ILOAD = 200 mA, See Figure 1 ILOAD = 100 mA to 800 mA, See Figure 1 ILOAD = 800 mA, See Figure 1 VFEEDBACK = 1.5 V (SWITCH Off) TJ 25°C Full range 25°C Full range 25°C Full range 25°C 25°C Full range 25°C Full range 25°C Full range 25°C Full range 25°C Full range 25°C 25°C Full range 25°C Full range 25°C Full range 25°C Full range 25°C Full range 25°C Full range 25°C Full range 25°C Full range 25°C TL3577-ADJ MIN 11.6 11.4 20 20 80 7.5 45 2.7 85 80 1.214 1.206 0.5 100 2400 1600 500 250 2.2 2 0.3 ±130 ±90 2.5 1.5 88 84 12.5 10 0.5 3.7 3 4.3 300 600 0.7 0.9 5.3 6 90 5 ±200 0.4 0.55 ±300 ±400 7.5 9.5 2.4 800 3700 300 800 4800 5800 1.23 100 10 14 70 85 2.85 2.95 115 120 1.246 1.254 TYP 12 MAX 12.4 12.6 50 100 50 100 UNIT V mV mV % Output voltage Line regulation Load regulation Efficiency η ICC Input supply current ISWITCH = 2 A, VCOMP = 2 V (maximum duty cycle) Input supply undervoltage lockout ISWITCH = 100 mA Oscillator frequency Reference voltage Reference voltage line regulation Error amplifier input bias current Error amplifier transconductance Error amplifier voltage gain Measured at SWITCH, ISWITCH = 100 mA Measured at FEEDBACK, VIN = 3 V to 40 V, VCOMP = 1 V VIN = 3 V to 40 V VCOMP = 1 V ICOMP = –30 µA to 30 µA, VCOMP = 1 V VCOMP = 1.1 V to 1.9 V, RCOMP = 1 MΩ (1) Upper limit, VFEEDBACK = 1 V Error amplifier output swing Lower limit, VFEEDBACK = 1.5 V Error amplifier output current VFEEDBACK = 1 V to 1.5 V, VCOMP = 1 V VFEEDBACK = 1 V, VCOMP = 0 VCOMP = 1.5 V, ISWITCH = 100 mA mA VUV fO VREF DVREF DVIN V kHz V mV nA µmho V/V IB GM AVOL V µA µA % A/V µA V A ISS D DISWITCH DVCOMP Soft-start current Maximum duty cyle Switch transconductance Switch leakage current Switch saturation voltage NPN switch current limit IL VSAT VSWITCH = 65 V, VFEEDBACK = 1.5 V (SWITCH off) ISWITCH = 2 A, VCOMP = 2 V (maximum duty cycle) VCOMP = 2 V 25°C Full range 25°C Full range 25°C Full range (1) 4 A 1-MΩ resistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL. In actual applications, this load resistance should be ≥10 MΩ, resulting in AVOL that is typically twice the specified minimum limit. Submit Documentation Feedback www.ti.com TL3577 100-kHz CURRENT-MODE SIMPLE STEP-UP/FLYBACK SWITCHING REGULATOR SLVS633 – OCTOBER 2006 Electrical Characteristics (continued) VIN = 5 V, VFEEDBACK = VREF, ISWITCH = 0 (unless otherwise noted) PARAMETER COMP current TEST CONDITIONS VCOMP = 0 V TJ 25°C Full range TL3577-ADJ MIN TYP 25 MAX 40 50 UNIT µA Submit Documentation Feedback 5 TL3577 100-kHz CURRENT-MODE SIMPLE STEP-UP/FLYBACK SWITCHING REGULATOR SLVS633 – OCTOBER 2006 www.ti.com TYPICAL CHARACTERISTICS REFERENCE VOLTAGE vs TEMPERATURE 1.25 1.248 0.4 ∆ REFERENCE VOLTAGE vs SUPPLY VOLTAGE 0.5 VREF – Reference Voltage – V 1.246 ∆ Reference Voltage – mV 1.244 1.242 1.24 1.238 1.236 1.234 1.232 1.23 -40 -25 -10 0.3 0.2 0.1 0 -0.1 -0.2 0 5 10 15 20 25 30 35 40 5 20 35 50 65 80 95 110 125 VIN – Supply Voltage – V TA – Temperature – ° C ERROR AMPLIFIER TRANSCONDUCTANCE vs TEMPERATURE 5000 G M – Error Amplifier Transconductance – µmho 4750 4500 4250 4000 3750 3500 3250 3000 2750 2500 -40 -25 -10 AV – Error Amplifier Voltage Gain – V/V ERROR AMPLIFIER VOLTAGE GAIN vs TEMPERATURE 1600 1500 1400 1300 1200 1100 1000 900 800 700 600 -40 -25 -10 5 20 35 50 65 80 95 110 125 5 20 35 50 65 80 95 110 125 TA – Temperature – ° C TA – Temperature – ° C 6 Submit Documentation Feedback www.ti.com TL3577 100-kHz CURRENT-MODE SIMPLE STEP-UP/FLYBACK SWITCHING REGULATOR SLVS633 – OCTOBER 2006 TYPICAL CHARACTERISTICS (continued) QUIESCENT CURRENT vs TEMPERATURE 11 10.5 10 IQ – Quiescent Current – mA Switch Current Limit – A SWITCH CURRENT LIMIT vs TEMPERATURE 6 5.8 5.6 5.4 5.2 5 4.8 4.6 4.4 4.2 9.5 9 8.5 8 7.5 7 6.5 6 -40 -25 -10 4 -40 -25 -10 5 20 35 50 65 80 95 110 125 5 20 35 50 65 80 95 110 125 TA – Temperature – ° C TA – Temperature – ° C FEEDBACK BIAS CURRENT vs TEMPERATURE 130 120 IB – FEEDBACK Bias Current – nA f O – Oscillator Frequency – kHz OSCILLATOR FREQUENCY vs TEMPERATURE 110 108 106 104 102 100 98 96 94 92 90 -40 -25 -10 110 100 90 80 70 60 50 40 30 -40 -25 -10 5 20 35 50 65 80 95 110 125 5 20 35 50 65 80 95 110 125 TA – Temperature – ° C TA – Temperature – ° C Submit Documentation Feedback 7 TL3577 100-kHz CURRENT-MODE SIMPLE STEP-UP/FLYBACK SWITCHING REGULATOR SLVS633 – OCTOBER 2006 www.ti.com TYPICAL CHARACTERISTICS (continued) SWITCH SATURATION VOLTAGE vs TEMPERATURE 0.9 0.85 VSAT – Switch Saturation Voltage – V 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 -40 -