TPS92510EVM-011

Using the TPS92510EVM-011 User's Guide Literature Number: SLUU977A JULY 2012 – Revised September 2013 Contents 1 2 Introduction ........................................................................................................................ 4 Description ......................................................................................................................... 4 ..................................................................................................... 4 .................................................................................................................. 4 3 Electrical Performance Specifications ................................................................................... 6 4 Schematic .......................................................................................................................... 7 5 Performance Data and Typical Characteristic Curves .............................................................. 8 5.1 Efficiency ................................................................................................................. 8 5.2 Input Voltage Ripple .................................................................................................... 8 5.3 Inductor Ripple Current ................................................................................................. 9 5.4 Bode Plot ................................................................................................................ 10 5.5 Start-Up Response Relative to Enable .............................................................................. 10 5.6 Clock Signal and Switch Node Voltage ............................................................................. 11 5.7 PWM Dimming ......................................................................................................... 12 5.8 Thermal Foldback Using a 50-K Potentiometer .................................................................... 12 5.9 Error Amplifier Sample and Hold vs. PWM Dimming at 200 Hz ................................................. 13 5.10 Thermal Performance ................................................................................................. 13 6 Assembly Drawing and PCB Layout .................................................................................... 14 Revision History ......................................................................................................................... 16 2 2.1 Typical Applications 2.2 Features Table of Contents SLUU977A – JULY 2012 – Revised September 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated www.ti.com List of Figures 1 4-Phase Clock Generator .................................................................................................. 5 2 4-Phase Clock Waveforms ................................................................................................ TPS92510EVM-011 Application Schematic ............................................................................. Efficiency vs. Number of LEDs (IOUT) ..................................................................................... Input Voltage Ripple, VIN = 43 Vdc........................................................................................ Input Voltage Ripple, VIN = 48 Vdc........................................................................................ Input Voltage Ripple, VIN = 53 Vdc........................................................................................ Input Voltage Ripple and Inductor Current .............................................................................. Input Voltage Ripple and LED Current ................................................................................... Loop Response Gain and Phase ........................................................................................ Start-Up Response Relative to Enable ................................................................................. External Clock Synchronization, fSW = 250 kHz ....................................................................... External Clock Synchronization, fSW = 500 kHz ....................................................................... External Clock Synchronization, fSW = 1 MHz .......................................................................... PWM Dimming, fPWM = 200 Hz, Duty Cycle = 5% ..................................................................... PWM Dimming, fPWM = 200 Hz, Duty Cycle = 95% .................................................................... Thermal Foldback ......................................................................................................... Thermal Foldback ........................................................................................................ Error Amplifier S/H, Duty Cycle = 90% ................................................................................ Error Amplifier S/H, Duty Cycle = 10% ................................................................................ Top Thermal Performance ............................................................................................... Bottom Thermal Performance ........................................................................................... TPS92510EVM-011 Top Layer Assembly Drawing .................................................................. TPS92510EVM-011 Bottom Copper (Bottom View) .................................................................. TPS92510EVM-011 Top Copper (Top View) .......................................................................... 5 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 SLUU977A – JULY 2012 – Revised September 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated List of Figures 7 8 8 8 8 9 9 10 10 11 11 11 12 12 12 12 13 13 13 13 14 14 15 3 User's Guide SLUU977A – JULY 2012 – Revised September 2013 1.5-A, Constant-Current, Non-Synchronous Buck Converter for High-Brightness LEDs with Integrated Thermal Foldback 1 Introduction The TPS92510EVM-011 evaluation module (EVM) helps designers evaluate the operation and performance of the TPS92510 DC/DC converter, a high-brightness light emitting diode (LED) driver. The converter is a wide input voltage (3.5 V to 60 V), 2.5-MHz, non-synchronous, externally compensated, step down converter capable of 1.5 A of output current. 2 Description The TPS92510EVM-011 provides a high-brightness LED driver based on the TPS92510. The EVM is designed to operate from a nominal 48 VDC ±10% input voltage source. This input voltage range is typical for input supplies derived from AC/DC sources The EVM provides an output current of 740 mA with an output voltage sufficient to drive four to ten off-board LEDs. 2.1 Typical Applications This converter design describes an application of the TPS92510 as an LED driver with the specification below. For applications with a different input voltage range or different numbers of LEDs, refer to the application report, How to Design an LED Driver Using the TPS92510 (TI Literature Number SLUA628). 2.2 Features 2.2.1 Connector Description This section describes the jumpers and connectors on the EVM and how to properly connect, setup and use the TPS92510EVM-011. 2.2.1.1 J1 (GND, VIN) This header is the return and positive input voltage supply to the converter. The leads to the input supply should be twisted and kept as short as possible to minimize EMI transmission. Additional bulk capacitance should be added between J1 and J2 if the supply leads are greater than six inches. An additional 1.0-µF or greater ceramic capacitor improves the transient response of the TPS92510 and helps to reduce ringing on the input when long supply wires are used. 2.2.1.2 J5 (PDIM, GND) This header is for dimming using pulse width modulation. PDIM is connected to the PDIM pin of the TPS92510. The average LED current and subsequent brightness is proportional to the applied PDIM signal duty cycle. When PDIM is greater than 1.35 V, the device drives current through the LEDs. When less than 0.9 V, the TPS92510 turns off and stops driving current through the LEDs. The PDIM frequency should be between 120 Hz and 1 kHz. 2.2.1.3 J3-1 (LED+) Connect anode to LED+. 4 1.5-A, Constant-Current, Non-Synchronous Buck Converter for HighBrightness LEDs with Integrated Thermal Foldback SLUU977A – JULY 2012 – Revised September 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Description www.ti.com 2.2.1.4 J3-2 (LED–) Connect anode to LED–. 2.2.1.5 J6,TP10 (SYNC Enable) Connect the shorting jumper on JP16 to use the external clock. As shown in Figure 1, synchronizing multiple TPS92510 LED drivers requires additional circuitry. VCC VCC 5 2 J PP 4 CLK 3 K 11 Q 6 14 J PP Q 10 12 CLK 13 K Q 7 Q 9 U1B CL 74HC109 15 U1A 74HC109 CL 1 CLOCK 74HC139 Y0 4 Phase 1 2 A Y1 5 Phase 2 3 B Y2 6 Phase 3 1 G Y3 7 Phase 4 RESET UDG-12088 Figure 1. 4-Phase Clock Generator Clock Phase 1 Phase 2 Phase 3 Phase 4 Time UDG-12089 Figure 2. 4-Phase Clock Waveforms 2.2.1.6 J2,J4,TP15 (NTC,GND) Connect external NTC thermistor from LED heatsink for thermal foldback. R14 along with J6 can be used either as a trim for the external thermistor or for stand-alone testing if no external thermistor is used. SLUU977A – JULY 2012 – Revised September 2013 Submit Documentation Feedback 1.5-A, Constant-Current, Non-Synchronous Buck Converter for HighBrightness LEDs with Integrated Thermal Foldback Copyright © 2012–2013, Texas Instruments Incorporated 5 Electrical Performance Specifications 2.2.1.7 www.ti.com Test Points Table 1 lists the test points provided to monitor the TPS92510EVM-011 performance Table 1. Test Points TEST POINT FUNCTION VIN Input voltage monitor PDIM LED dimming with external PWM signal LED+ LED voltage monitor LED- 3 SYNC Synchronization function access VNTC External thermistor monitor Q1 GATE Output enable control LOOP_A Control loop channel A injection and measurement point ISENSE Control loop channel B injectionand and current measurement point PH Switch node monitor GND Multiple grounds for signal references Electrical Performance Specifications Table 2 provides a summary of the converters specifications. The converter is designed and tested for an input voltage of 48 V±10%. Operation at other input voltages is possible but some performance specifications vary compared to those shown. The ambient temperature is 25°C for all measurements, unless otherwise noted. Table 2. TPS92510EVM-011 Converter Specifications PARAMETER VIN Input voltage range IOUT Output current VOUT Output voltage TEST CONDITIONS MIN 43 Load between 4 and 12 LEDs 13.8 η Efficiency VTURN-ON 6 (1) V mA V kHz 90 ° kHz VIN = 48 V, IOUT = 740 mA , Load 10 LEDs 96% VIN rising, IOUT = 740 mA 42.2 VIN falling, IOUT = 740 mA 40.8 tRISE VIN = 12 V 100 Output current rise time UNITS 370 VTURN-OFF Converter disable voltage (1) Converter enable voltage 53 38.4 20 Phase margin Switching frequency 48 MAX 740 Loop bandwidth fSW TYP V µs Converter enable disable voltage should be adjusted relative to number of LED threshold to be 3 VDC greater than maximum forward voltage of the string. See the TI Design Guide (TI Literature Number SLVA628) to determine values for R4 and R5. 1.5-A, Constant-Current, Non-Synchronous Buck Converter for HighBrightness LEDs with Integrated Thermal Foldback SLUU977A – JULY 2012 – Revised September 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Schematic www.ti.com 4 Schematic D2 TP8 PH ES1D C7 VIN: 43 VDC to 53 VDC 0.1uF R5 54.9k 1 BOOT PH 10 2 VIN 3 EN TP9 PDIM TP10 SYNC TP11 Q1 GATE SYNC Enable BSS138 R10 10k 5 RT/CLK J6 TP3 LED+ 100uH COMP 8 ISENSE 7 TSENSE 6 + 11 348k Q1 TP1 VIN TPS92510DGQ 4 PDIM R13 Output: 0.740 A, 14V to 36Vdc GND 9 PWPD TP5 EN L1 U1 TPS92510DGQ C11 C10 C13 1 1.0uF 1.0uF 2 + C1 1 1 J3 TP4 LED- R11 4.02k C8 R4 1.62k 470pF R3 1.0k TP15 TSENSE J1 VIN 1 GND 2 + C4 1 C2 C3 0.01uF 1.0uF C9 C14 1.0uF 1 R1 R7 TP2 GND J2 R12 49.9 TP7 ISENSE TP13 LOOP A COMP 49.9 50k 1 C12 2 0.01uF NTC D1 R9 1.00k R6 887 B260-13-F C6 J4 470pF C5 R8 0.270 ohm R2 1 4.7nF AGND TP12 TP14 Notes: 1 Do Not Populate Figure 3. TPS92510EVM-011 Application Schematic SLUU977A – JULY 2012 – Revised September 2013 Submit Documentation Feedback 1.5-A, Constant-Current, Non-Synchronous Buck Converter for High-Brightness LEDs with Integrated Thermal Foldback Copyright © 2012–2013, Texas Instruments Incorporated 7 Performance Data and Typical Characteristic Curves 5 www.ti.com Performance Data and Typical Characteristic Curves Figure 4 through Figure 20 present typical performance curves for TPS92510EVM-011. 5.1 Efficiency 100 95 Efficiency (%) 90 85 80 75 IOUT = 100 mA IOUT = 200 mA IOUT = 300 mA IOUT = 500 mA IOUT = 700 mA 70 65 fSW = 350 kHz 60 3 4 5 6 7 8 Number of LEDs (Load) 9 10 G000 Figure 4. Efficiency vs. Number of LEDs (IOUT) 5.2 Input Voltage Ripple Figure 5. Input Voltage Ripple, VIN = 43 Vdc 8 1.5-A, Constant-Current, Non-Synchronous Buck Converter for HighBrightness LEDs with Integrated Thermal Foldback Figure 6. Input Voltage Ripple, VIN = 48 Vdc SLUU977A – JULY 2012 – Revised September 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Performance Data and Typical Characteristic Curves www.ti.com Figure 7. Input Voltage Ripple, VIN = 53 Vdc 5.3 Inductor Ripple Current Figure 8. Input Voltage Ripple and Inductor Current SLUU977A – JULY 2012 – Revised September 2013 Submit Documentation Feedback Figure 9. Input Voltage Ripple and LED Current 1.5-A, Constant-Current, Non-Synchronous Buck Converter for HighBrightness LEDs with Integrated Thermal Foldback Copyright © 2012–2013, Texas Instruments Incorporated 9 Performance Data and Typical Characteristic Curves 5.4 www.ti.com Bode Plot Figure 10. Loop Response Gain and Phase 5.5 Start-Up Response Relative to Enable Figure 11. Start-Up Response Relative to Enable 10 1.5-A, Constant-Current, Non-Synchronous Buck Converter for HighBrightness LEDs with Integrated Thermal Foldback SLUU977A – JULY 2012 – Revised September 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Performance Data and Typical Characteristic Curves www.ti.com 5.6 Clock Signal and Switch Node Voltage Figure 12. External Clock Synchronization, fSW = 250 kHz Figure 13. External Clock Synchronization, fSW = 500 kHz Figure 14. External Clock Synchronization, fSW = 1 MHz SLUU977A – JULY 2012 – Revised September 2013 Submit Documentation Feedback 1.5-A, Constant-Current, Non-Synchronous Buck Converter for HighBrightness LEDs with Integrated Thermal Foldback Copyright © 2012–2013, Texas Instruments Incorporated 11 Performance Data and Typical Characteristic Curves 5.7 PWM Dimming Figure 15. PWM Dimming, fPWM = 200 Hz, Duty Cycle = 5% 5.8 Figure 16. PWM Dimming, fPWM = 200 Hz, Duty Cycle = 95% Thermal Foldback Using a 50-K Potentiometer Figure 17. Thermal Foldback 12 www.ti.com 1.5-A, Constant-Current, Non-Synchronous Buck Converter for HighBrightness LEDs with Integrated Thermal Foldback Figure 18. Thermal Foldback SLUU977A – JULY 2012 – Revised September 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Performance Data and Typical Characteristic Curves www.ti.com 5.9 Error Amplifier Sample and Hold vs. PWM Dimming at 200 Hz Figure 19. Error Amplifier S/H, Duty Cycle = 90% Figure 20. Error Amplifier S/H, Duty Cycle = 10% 5.10 Thermal Performance Figure 21 and Figure 22 show the thermal performance of the EVM under the following conditions: • Load of 12 LEDs • IOUT = 740 mA • VIN - 48 Vdc Figure 21. Top Thermal Performance SLUU977A – JULY 2012 – Revised September 2013 Submit Documentation Feedback Figure 22. Bottom Thermal Performance 1.5-A, Constant-Current, Non-Synchronous Buck Converter for HighBrightness LEDs with Integrated Thermal Foldback Copyright © 2012–2013, Texas Instruments Incorporated 13 Assembly Drawing and PCB Layout 6 www.ti.com Assembly Drawing and PCB Layout The following figures (Figure 23 through Figure 25) show the design of the printed circuit board Figure 23. TPS92510EVM-011 Top Layer Assembly Drawing Figure 24. TPS92510EVM-011 Bottom Copper (Bottom View) 14 1.5-A, Constant-Current, Non-Synchronous Buck Converter for HighBrightness LEDs with Integrated Thermal Foldback SLUU977A – JULY 2012 – Revised September 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Assembly Drawing and PCB Layout www.ti.com Figure 25. TPS92510EVM-011 Top Copper (Top View) Table 3. List of Materials REFERNCE DESIGNATOR QTY U1 1 C13, C3, C14, C10 4 C2,C12 VALUE DESCRIPTION SIZE PART NUMBER MFR DC-DC Converter MSOP-10 TPS92510DGQ TI 1.0 µF Capacitor, Ceramic, 100V, X5R, 20% 2220 Std Std 1 0.01 µF Capacitor, Ceramic, 100 V, X7R, 10% 0603 Std Std C5 1 4700 pF Capacitor, Ceramic, 50 V, X7R, 10% 0603 Std Std C6,C8 1 470 pF Capacitor, Ceramic, 50 V, 10% 0603 Std Std C7 1 0.1 µF Capacitor, Ceramic, 25 V, X5R, 10% 0603 Std Std D1 1 B260-13-F Diode, Schottky, 60 V, 2 A SMB B260-13-F Vishay L1 1 100 µH Inductor, SMT, Power choke 12mm×12mm 74477020 Wurth R1,R12 2 49.9 Ω Resistor, Chip, 1/16W, 1% 0603 Std Std R3,R9 2 1 kΩ Resistor, Chip, 1/16W, 1% 0603 Std Std R4 1 1.62 kΩ Resistor, Chip, 1/16W, 1% 0603 Std Std R5 1 54.9 kΩ Resistor, Chip, 1/16W, 1% 0603 Std Std R6 1 887 Ω Resistor, Chip, 1/16W, 1% 0603 Std Std R7 1 50 kΩ Potentiometer 296UD503B1N CTS R8 1 270 mΩ Resistor, Chip, 1W, 1% 1206 Std Std R11 1 4.02 kΩ Resistor, Chip, 1/16W, 1% 0603 Std Std R13 1 34 8 kΩ Resistor, Chip, 1/16W, 1% 0603 Std Std D2 1 B260-13-F Diode, Schottky, 60 V, 2 A SMB B260-13-F Vishay Q1 1 BSS138 MOSFET, N-channel, 50 V, 220 mA SMB BSS138 Fairchild R10 1 10.0 kΩ Resistor, Chip, 1/16W, 1% 0603 Std Std SLUU977A – JULY 2012 – Revised September 2013 Submit Documentation Feedback 1.5-A, Constant-Current, Non-Synchronous Buck Converter for High-Brightness LEDs with Integrated Thermal Foldback Copyright © 2012–2013, Texas Instruments Incorporated 15 Revision History www.ti.com Revision History Changes from Original (July 2012) to A Revision ........................................................................................................... Page • Replaced Figure 3 with better quality image .......................................................................................... 7 NOTE: Page numbers for previous revisions may differ from page numbers in the current version. 16 Revision History SLUU977A – JULY 2012 – Revised September 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods. Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from the date of delivery for a full refund. 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