Texas Instruments TPS61054EVM-273 User manual

User's GuideSLVU214 – June 2008
TPS61054EVM-273
This user’s guide describes the characteristics, operation, and use of the TPS61054EVM-273 evaluationmodule (EVM). This EVM demonstrates the Texas Instruments TPS61054 synchronousboost-converter-based high-power WLED driver. This document includes setup instructions, a schematicdiagram, a bill of materials, and PCB layout drawings for the evaluation module.
Contents1 Introduction ................................................................................................................... 22 Input/Output Connector Descriptions...................................................................................... 23 Test Results .................................................................................................................. 44 Board Layout ................................................................................................................. 75 Schematic and Bill of Materials ........................................................................................... 106 Related Documentation From Texas Instruments ..................................................................... 12
List of Figures
1 LED Efficiency vs Input Voltage – Torch Mode with ILED=75mA ..................................................... 42 LED Efficiency vs Input Voltage – Single-Pulse Flash Mode with ILED=700mA .................................... 53 Torch Flash Sequence ...................................................................................................... 54 Start-Up in Torch ............................................................................................................. 65 Voltage-Mode Efficiency .................................................................................................... 66 Voltage-Mode Load Transient .............................................................................................. 77 Assembly Layer .............................................................................................................. 88 Top Layer ..................................................................................................................... 89 Layer 2 ........................................................................................................................ 910 Layer 3 ....................................................................................................................... 911 Bottom Layer ................................................................................................................ 1012 TPS61054/5EVM-273 Schematic ........................................................................................ 11
List of Tables
1 Typical Performance Specification Summary ............................................................................ 22 Jumper Settings .............................................................................................................. 43 HPA273E-1 Bill of Materials .............................................................................................. 12
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1 Introduction
1.1 Performance Specification Summary
1.2 Modifications
2 Input/Output Connector Descriptions
2.1 J1 – VIN
2.2 J2 – GND
2.3 J3 – FLASH / GND
Introduction www.ti.com
The Texas Instruments TPS61054EVM-273 evaluation module uses the TPS61054 synchronous boostconverter-based high-power WLED driver. This WLED driver requires an input voltage between 2.5 V and6 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.
Table 1 provides a summary of the TPS61054EVM-273 performance specifications. All specifications aregiven for an ambient temperature of 25 °C.
Table 1. Typical Performance Specification Summary
VOLTAGE RANGE CURRENT RANGE(V) (mA)CONDITION
MIN TYP MAX MIN TYP MAX
V
IN
2.5 6 2000supply
V
OUT
MODE0 = MODE1 = 1 4.85 5 5.15Torch current (MODE0 = 1 and MODE1 = 0 OR
75
(1)MODE0 = 0 and MODE1 = 1)I
LED
Flash current (MODE0 = 0 and MODE1 = 1 and
700
(2)FLASH_SYNC = 1)
(1)
±15% tolerance(2)
±12% tolerance
To aid user customization of the EVM, the board was designed with devices having 0603 or largerfootprints. A real implementation likely occupies less total board space.
Changing components can improve or degrade EVM performance. For example, adding a physicallylarger inductor with lower DCR improves efficiency.
This section describes the jumpers and connectors on the EVM as well as how properly to connect, setup, and use the TPS61054EVM-273.
This header is for the positive input supply voltage to the converter. The leads to the input supply shouldbe twisted and kept as short as possible to minimize EMI transmission and reduce inductive voltage droopat a load transient event.
This is the return connection for the input power supply of the converter.
This header connects to the FLASH_SYNC pin of the IC and to GND. It can be used to measure thevoltage on the FLASH_SYNC pin and/or apply an external signal to the FLASH_SYNC pin.
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2.4 J4 – PULSE GEN / GND
2.5 J5 – TRANS RES
2.6 J6 – VOUT
2.7 J7 – LED
2.8 J8 – GND
2.9 JP1 – TX-TOFF
2.10 JP2 – MODE0
2.11 JP3 – MODE1
2.12 JP5 – OPEN LED
2.13 S1 – FLASH
www.ti.com Input/Output Connector Descriptions
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 confirmstability.
This header connects to the drain of transistor Q1.
This header connects to the VOUT pin IC. In voltage-regulation mode, it can be used to measure theregulated output voltage and connect an external load resistance. In current-regulation mode, it connectsto the WLED cathode and can be used to measure the high-side WLED voltage.
This header connects to the LED pin of the IC. In current-regulation mode, it connects to the WLED anodeand can be used to measure the low-side WLED voltage. It is not used in voltage-regulation mode.
This header connects to the board ground plane and is the return for the VOUT header.
This jumper can be used to connect the TX-TOFF pin high (to the input voltage) or low (to ground).
This jumper can be used to connect the MODE0 pin high (to the input voltage) or low (to ground). See thedevice data sheet (SLUS760 ) for an explanation of configuration settings.
This jumper can be used to connect the MODE1 pin high (to the input voltage) or low (to ground). See thedevice data sheet (SLUS760 ) for an explanation of configuration settings.
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 isinstalled.
This push-button switch connects to the IC FLASH_SYNC pin and allows the user to initiate a WLED flashevent.
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2.14 Hardware Setup
3 Test Results
VI− Input Voltage − V
40
50
60
70
80
90
100
2.5 3.0 3.5 4.0 4.5 5.0 5.5
LED Efficiency − %
G001
Test Results www.ti.com
Table 2 shows the DEFAULT board jumper settings.
Table 2. Jumper Settings
JUMPER DEFAULT
JP1 LOJP2 LOJP3 LOJP4 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 tomitigate the inductive voltage droop that occurs at torch-current start-up and especially when the flashpulse occurs. Turn on the power supply.
WARNINGWARNING: This EVM has a white LED that flashes very brightly.Protective eye wear and/or a diffuser to cover the white LED duringoperation is recommended.
This section provides typical performance waveforms for the TPS61054/5EVM-273 board.
Figure 1. LED Efficiency vs Input Voltage – Torch Mode with ILED=75mA
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VI− Input Voltage − V
0
10
20
30
40
50
60
70
80
90
2.5 3.0 3.5 4.0 4.5 5.0 5.5
LED Efficiency (PLED/PIN) − %
G002
ILED = 700 mA
www.ti.com Test Results
Figure 2. LED Efficiency vs Input Voltage – Single-Pulse Flash Mode with ILED=700mA
Figure 3. Torch Flash Sequence
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0
10
20
30
40
50
60
70
80
90
100
IO− Output Current − mA
VI= 3.6 V
VO= 5 V
Efficiency − %
10 100 1k 10k
G003
Test Results www.ti.com
Figure 4. Start-Up in Torch
Figure 5. Voltage-Mode Efficiency
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4 Board Layout
www.ti.com Board Layout
Figure 6. Voltage-Mode Load Transient
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 11show the board layout for the TPS61054EVM-273 PCB. The nodes with high switching frequencies andcurrents are kept as short as possible to minimize trace inductance. Careful attention has been given tothe routing of high-frequency current loops, and a single-point grounding scheme is used. See the devicedata sheet (SLUS760 ) for specific layout guidelines.
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K001
K002
Board Layout www.ti.com
Figure 7. Assembly Layer
Figure 8. Top Layer
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K003
K004
www.ti.com Board Layout
Figure 9. Layer 2
Figure 10. Layer 3
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K005
5 Schematic and Bill of Materials
Schematic and Bill of Materials www.ti.com
Figure 11. Bottom Layer
This section provides the TPS61054EVM-273 schematic and bill of materials.
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5.1 Schematic
S001
Case temperature of component may exceed 60°C.
www.ti.com Schematic and Bill of Materials
Figure 12. TPS61054/5EVM-273 Schematic
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5.2 Bill of Materials
6 Related Documentation From Texas Instruments
Related Documentation From Texas Instruments www.ti.com
Table 3. HPA273E-1 Bill of MaterialsRefDes Count Value Description Size Part Number MFR
C1 1 1000 pF Capacitor, ceramic, 50-V, X7R, 10% 0603 C1608X7R1H102K TDK
C2, C3 2 10 µF 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 ×0.232 LXCL-PWM1 Lumiledsin. (4.22 ×5.89mm)
J1, J2, J3, J6, 6 PTC36SAAN Header, 2-pin, 100-mil (2.54-mm) spacing, 0.100 in. (2.54 PTC36SAAN SullinsJ7, J8 (36-pin strip) mm) ×2
J4, J5 0 Open Header, 2-pin, 100-mil (2.54-mm) spacing, 0.100 in. (2.54 PTC36SAAN Sullins(36-pin strip) mm) ×2
JP1, JP2, JP3 3 PTC36SAAN Header, 3-pin, 100-mil (2.54-mm) spacing, 0.100 in. (2.54 PTC36SAAN Sullins(36-pin strip) mm) ×3
JP4 1 PTC36SAAN Header, 2-pin, 100-mil (2.54-mm) spacing, 0.100 in. (2.54 PTC36SAAN Sullins(36-pin strip) mm) ×2
L1 1 2.2 µH Inductor, SMT, 1.5-A, 110-m Ω0.118 ×0.118 LPS3015-222ML Coilcraftin. (3 ×3 mm)
Q1 0 Open MOSFET, N-ch SOT23
R1 1 15 k ΩResistor, 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 0.245 ×0.251 KT11P2JM C & Kwashable in. (6.22 ×6.38mm)
U1 1 TPS61054DR IC, high-power white LED driver SON-10 TPS61054DRC TIC
– 4 Shunt, 100-mil (2.54-mm), black 0.1 929950-00 3M
– 1 PCB, 1.9 ×3.35 ×0.062 in. (48.3 ×85.1 ×HPA273 Rev A Any1.58 mm)
TPS61054, TPS61055 High Power White LED Driver 2-MHz Synchronous Boost Converter With StandardLogic Interface data sheet (SLUS760 )
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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 PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must haveelectronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be completein terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmentalmeasures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit doesnot 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 fromthe date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYERAND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OFMERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claimsarising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and allappropriate precautions with regard to electrostatic discharge.EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANYINDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents orservices 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. Thisnotice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/orsafety 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, orcombination 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 PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radiofrequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which aredesigned to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments maycause interference with radio communications, in which case the user at his own expense will be required to take whatever measures maybe 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 questionsconcerning 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 85 °C. The EVM is designed to operateproperly with certain components above 85 °C as long as the input and output ranges are maintained. These components include but arenot limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identifiedusing 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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