User's Guide SLVU214 - June 2008 TPS61054EVM-273 This user's guide describes the characteristics, operation, and use of the TPS61054EVM-273 evaluation module (EVM). This EVM demonstrates the Texas Instruments TPS61054 synchronous boost-converter-based high-power WLED driver. This document includes setup instructions, a schematic diagram, a bill of materials, and PCB layout drawings for the evaluation module. 1 2 3 4 5 6 Contents Introduction ................................................................................................................... 2 Input/Output Connector Descriptions...................................................................................... 2 Test Results .................................................................................................................. 4 Board Layout ................................................................................................................. 7 Schematic and Bill of Materials ........................................................................................... 10 Related Documentation From Texas Instruments ..................................................................... 12 List of Figures 1 2 3 4 5 6 7 8 9 10 11 12 LED Efficiency vs Input Voltage - Torch Mode with ILED=75mA ..................................................... 4 LED Efficiency vs Input Voltage - Single-Pulse Flash Mode with ILED=700mA .................................... 5 Torch Flash Sequence ...................................................................................................... 5 Start-Up in Torch ............................................................................................................. 6 Voltage-Mode Efficiency .................................................................................................... 6 Voltage-Mode Load Transient .............................................................................................. 7 Assembly Layer .............................................................................................................. 8 Top Layer ..................................................................................................................... 8 Layer 2 ........................................................................................................................ 9 Layer 3 ....................................................................................................................... 9 Bottom Layer ................................................................................................................ 10 TPS61054/5EVM-273 Schematic ........................................................................................ 11 List of Tables 1 2 3 Typical Performance Specification Summary ............................................................................ 2 Jumper Settings .............................................................................................................. 4 HPA273E-1 Bill of Materials .............................................................................................. 12 SLVU214 - June 2008 Submit Documentation Feedback TPS61054EVM-273 1 Introduction 1 www.ti.com Introduction The Texas Instruments TPS61054EVM-273 evaluation module uses the TPS61054 synchronous boost converter-based high-power WLED driver. This WLED driver requires an input voltage between 2.5 V and 6 V. The driver is configurable by on-board jumpers to either regulate output voltage or the output current. The goal of the EVM is to facilitate evaluation of the TPS61054 IC. 1.1 Performance Specification Summary Table 1 provides a summary of the TPS61054EVM-273 performance specifications. All specifications are given for an ambient temperature of 25C. Table 1. Typical Performance Specification Summary CONDITION VOLTAGE RANGE (V) MIN VIN supply VOUT ILED (1) (2) 1.2 TYP 2.5 MODE0 = MODE1 = 1 4.85 CURRENT RANGE (mA) MAX 6 5 MIN TYP MAX 2000 5.15 Torch current (MODE0 = 1 and MODE1 = 0 OR MODE0 = 0 and MODE1 = 1) 75 (1) Flash current (MODE0 = 0 and MODE1 = 1 and FLASH_SYNC = 1) 700 (2) 15% tolerance 12% tolerance Modifications To aid user customization of the EVM, the board was designed with devices having 0603 or larger footprints. A real implementation likely occupies less total board space. Changing components can improve or degrade EVM performance. For example, adding a physically larger inductor with lower DCR improves efficiency. 2 Input/Output Connector Descriptions This section describes the jumpers and connectors on the EVM as well as how properly to connect, set up, and use the TPS61054EVM-273. 2.1 J1 - VIN This header is for the positive input supply voltage to the converter. The leads to the input supply should be twisted and kept as short as possible to minimize EMI transmission and reduce inductive voltage droop at a load transient event. 2.2 J2 - GND This is the return connection for the input power supply of the converter. 2.3 J3 - FLASH / GND This header connects to the FLASH_SYNC pin of the IC and to GND. It can be used to measure the voltage on the FLASH_SYNC pin and/or apply an external signal to the FLASH_SYNC pin. 2 TPS61054EVM-273 SLVU214 - June 2008 Submit Documentation Feedback www.ti.com 2.4 Input/Output Connector Descriptions J4 - PULSE GEN / GND This header can be used to connect an external pulse generator to drive the gate of transistor Q1. Transistor Q1, along with components R2-R4, can be used to perform load transient testing and confirm stability. 2.5 J5 - TRANS RES This header connects to the drain of transistor Q1. 2.6 J6 - VOUT This header connects to the VOUT pin IC. In voltage-regulation mode, it can be used to measure the regulated output voltage and connect an external load resistance. In current-regulation mode, it connects to the WLED cathode and can be used to measure the high-side WLED voltage. 2.7 J7 - LED This header connects to the LED pin of the IC. In current-regulation mode, it connects to the WLED anode and can be used to measure the low-side WLED voltage. It is not used in voltage-regulation mode. 2.8 J8 - GND This header connects to the board ground plane and is the return for the VOUT header. 2.9 JP1 - TX-TOFF This jumper can be used to connect the TX-TOFF pin high (to the input voltage) or low (to ground). 2.10 JP2 - MODE0 This jumper can be used to connect the MODE0 pin high (to the input voltage) or low (to ground). See the device data sheet (SLUS760) for an explanation of configuration settings. 2.11 JP3 - MODE1 This jumper can be used to connect the MODE1 pin high (to the input voltage) or low (to ground). See the device data sheet (SLUS760) for an explanation of configuration settings. 2.12 JP5 - OPEN LED This jumper is in series with power WLED D1. For the WLED to turn on, this jumper must be shorted. Placing an ammeter in series allows the user to measure current. The jumper in its default position is installed. 2.13 S1 - FLASH This push-button switch connects to the IC FLASH_SYNC pin and allows the user to initiate a WLED flash event. SLVU214 - June 2008 Submit Documentation Feedback TPS61054EVM-273 3 Test Results www.ti.com 2.14 Hardware Setup Table 2 shows the DEFAULT board jumper settings. Table 2. Jumper Settings JUMPER DEFAULT JP1 LO JP2 LO JP3 LO JP4 SHORTED Connect to J1 and J2 an input power supply rated at least 2-A and set to provide between 2.5 V and 6 V. The leads should be very short. Additional input capacitance on the C4 pads may be required in order to mitigate the inductive voltage droop that occurs at torch-current start-up and especially when the flash pulse occurs. Turn on the power supply. WARNING WARNING: This EVM has a white LED that flashes very brightly. Protective eye wear and/or a diffuser to cover the white LED during operation is recommended. 3 Test Results This section provides typical performance waveforms for the TPS61054/5EVM-273 board. 100 LED Efficiency - % 90 80 70 60 50 40 2.5 3.0 3.5 4.0 4.5 VI - Input Voltage - V 5.0 5.5 G001 Figure 1. LED Efficiency vs Input Voltage - Torch Mode with ILED=75mA 4 TPS61054EVM-273 SLVU214 - June 2008 Submit Documentation Feedback Test Results www.ti.com 90 LED Efficiency (PLED/PIN) - % 80 ILED = 700 mA 70 60 50 40 30 20 10 0 2.5 3.0 3.5 4.0 4.5 5.0 VI - Input Voltage - V 5.5 G002 Figure 2. LED Efficiency vs Input Voltage - Single-Pulse Flash Mode with ILED=700mA Figure 3. Torch Flash Sequence SLVU214 - June 2008 Submit Documentation Feedback TPS61054EVM-273 5 Test Results www.ti.com Figure 4. Start-Up in Torch 100 VI = 3.6 V VO = 5 V 90 80 Efficiency - % 70 60 50 40 30 20 10 0 10 100 1k IO - Output Current - mA 10k G003 Figure 5. Voltage-Mode Efficiency 6 TPS61054EVM-273 SLVU214 - June 2008 Submit Documentation Feedback Board Layout www.ti.com Figure 6. Voltage-Mode Load Transient 4 Board Layout This section provides the TPS61054EVM-273 board layout and illustrations. Board layout is critical for all high-frequency, switch-mode power supplies. Figure 7 through Figure 11 show the board layout for the TPS61054EVM-273 PCB. The nodes with high switching frequencies and currents are kept as short as possible to minimize trace inductance. Careful attention has been given to the routing of high-frequency current loops, and a single-point grounding scheme is used. See the device data sheet (SLUS760) for specific layout guidelines. SLVU214 - June 2008 Submit Documentation Feedback TPS61054EVM-273 7 Board Layout www.ti.com K001 Figure 7. Assembly Layer K002 Figure 8. Top Layer 8 TPS61054EVM-273 SLVU214 - June 2008 Submit Documentation Feedback Board Layout www.ti.com K003 Figure 9. Layer 2 K004 Figure 10. Layer 3 SLVU214 - June 2008 Submit Documentation Feedback TPS61054EVM-273 9 Schematic and Bill of Materials www.ti.com K005 Figure 11. Bottom Layer 5 Schematic and Bill of Materials This section provides the TPS61054EVM-273 schematic and bill of materials. 10 TPS61054EVM-273 SLVU214 - June 2008 Submit Documentation Feedback Schematic and Bill of Materials www.ti.com Schematic Case temperature of component may exceed 60C. S001 5.1 Figure 12. TPS61054/5EVM-273 Schematic SLVU214 - June 2008 Submit Documentation Feedback TPS61054EVM-273 11 Related Documentation From Texas Instruments 5.2 www.ti.com Bill of Materials Table 3. HPA273E-1 Bill of Materials RefDes 6 Count Value Description Size Part Number MFR C1 1 1000 pF Capacitor, ceramic, 50-V, X7R, 10% 0603 C1608X7R1H102K TDK C2, C3 2 10 F Capacitor, ceramic, 6.3-V, X5R, 20% 0603 C1608X5R0J106MT TDK C4 0 Open Capacitor, multipattern, 16-V, X5R, 20% 7343 (D) Std Std D1 1 LXCL-PWM1 LED, white, 350-mA 0.166 x 0.232 in. (4.22 x 5.89 mm) LXCL-PWM1 Lumileds J1, J2, J3, J6, J7, J8 6 PTC36SAAN Header, 2-pin, 100-mil (2.54-mm) spacing, (36-pin strip) 0.100 in. (2.54 mm) x 2 PTC36SAAN Sullins J4, J5 0 Open Header, 2-pin, 100-mil (2.54-mm) spacing, (36-pin strip) 0.100 in. (2.54 mm) x 2 PTC36SAAN Sullins JP1, JP2, JP3 3 PTC36SAAN Header, 3-pin, 100-mil (2.54-mm) spacing, (36-pin strip) 0.100 in. (2.54 mm) x 3 PTC36SAAN Sullins JP4 1 PTC36SAAN Header, 2-pin, 100-mil (2.54-mm) spacing, (36-pin strip) 0.100 in. (2.54 mm) x 2 PTC36SAAN Sullins L1 1 2.2 H Inductor, SMT, 1.5-A, 110-m 0.118 x 0.118 in. (3 x 3 mm) LPS3015-222ML Coilcraft Q1 0 Open MOSFET, N-ch SOT23 R1 1 15 k Resistor, chip, 1/16-W, 1% 0603 Std Std R2, R3 0 Open Resistor, chip, 1/16-W, 1% 0603 Std Std R4 0 Open Resistor, chip, 1-W, 1% 2512 Std Std S1 1 KT11P2JM Switch, SPST, PB momentary, sealed washable 0.245 x 0.251 in. (6.22 x 6.38 mm) KT11P2JM C&K U1 1 TPS61054DR C IC, high-power white LED driver SON-10 TPS61054DRC TI - 4 Shunt, 100-mil (2.54-mm), black 0.1 929950-00 3M - 1 PCB, 1.9 x 3.35 x 0.062 in. (48.3 x 85.1 x 1.58 mm) HPA273 Rev A Any Related Documentation From Texas Instruments TPS61054, TPS61055 High Power White LED Driver 2-MHz Synchronous Boost Converter With Standard Logic Interface data sheet (SLUS760) 12 TPS61054EVM-273 SLVU214 - June 2008 Submit Documentation Feedback EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives. 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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TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein. Please read the User's Guide and, specifically, the Warnings and Restrictions notice in the User's Guide prior to handling the product. This notice contains important safety information about temperatures and voltages. For additional information on TI's environmental and/or safety programs, please contact the TI application engineer or visit www.ti.com/esh. No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or combination in which such TI products or services might be or are used. FCC Warning This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference. EVM WARNINGS AND RESTRICTIONS It is important to operate this EVM within the input voltage range of 2.5 V to 6 V and the output voltage range of 4.85 V to 5.15 V. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power. Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative. During normal operation, some circuit components may have case temperatures greater than 85C. The EVM is designed to operate properly with certain components above 85C as long as the input and output ranges are maintained. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. 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