Texas Instruments TPS61050EVM-215 User manual

User's GuideSLVU202B – May 2007 – Revised November 2007
TPS61050EVM-215 and TPS61052EVM-215
This user’s guide describes the characteristics, operation, and use of the TPS61050EVM-215 andTPS61052EVM-215 evaluation modules (EVMs). This EVM demonstrates either the Texas InstrumentsTPS61050 or TPS61052 synchronous boost converter based high power WLED driver with I
2
C interface.This document includes setup instructions, a schematic diagram, a bill of materials, and PCB layoutdrawings for the evaluation module.
Contents1 Introduction ................................................................................................................... 22 Setup .......................................................................................................................... 23 Software Setup and Operation ............................................................................................. 64 Test Results .................................................................................................................. 75 Board Layout ................................................................................................................ 116 Schematics and Bill of Materials ......................................................................................... 14
List of Figures
1 TPS6105x Software Main Panel ........................................................................................... 62 LED Efficiency vs. Input Voltage - Torch Mode .......................................................................... 73 LED Efficiency vs. Input voltage - Single Pulse Flash Mode ........................................................... 84 Torch Flash Sequence ...................................................................................................... 85 Start Up in Torch ............................................................................................................. 96 Inrush Current at Flash .................................................................................................... 107 Voltage Mode Efficiency ................................................................................................... 108 Voltage Mode Load Transient ............................................................................................ 119 Assembly Layer............................................................................................................. 1210 Top Layer .................................................................................................................... 1211 Layer 2 ....................................................................................................................... 1312 Layer 3 ...................................................................................................................... 1313 Bottom Layer ................................................................................................................ 1414 TPS61050/2EVM-215 Schematic ........................................................................................ 15
List of Tables
1 Jumper Settings .............................................................................................................. 52 HPA215 Bill of Materials................................................................................................... 16
Windows is a trademark of Microsoft Corporation.I
2
C is a trademark of Philips Corporation.VeriSign is a trademark of VeriSign, Inc..
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1 Introduction
1.1 Requirements
2 Setup
2.1 Input/Output Connector Descriptions
2.1.1 J1 – VIN
2.1.2 J2 – GND
Introduction
To operate this EVM, connect and properly configure the following components:A personal computer (PC) with a USB port is required to operate this EVM. The TPS61050/2 interfacesoftware runs on the PC and communicates with the EVM via the PC’s USB port. Commands can besent to the internal registers of the TPS61050/2 through the USB port.
Personal Computer Requirements•Windows™ 2000 or Windows™ XP operating system•USB port•Minimum of 30 MB of free hard disk space (100 MB recommended)•Minimum of 256 MB of RAM
Printed-Circuit Board AssemblyThe board contains the either the TPS61050 or TPS61052 IC in QFN package, its required externalcomponents and a high power WLED.
USB-TO-GPIO AdapterThe USB-TO-GPIO adapter is the link that allows the PC and the EVM to communicate. One end ofthe USB interface adapter connects to the PC with the supplied USB cable; the other side of the USBinterface adapter connects to the EVM with the supplied ribbon cable.When a command is written to the EVM, the interface program running on the PC sends thecommands to the PC USB port. The USB interface adapter receives the USB command, converts thesignal to an I
2
C protocol, and sends the I
2
C signal to the TPS61050/2 EVM board
Software
Texas Instruments provides software to assist in evaluating this EVM. The software can be installedfrom the supplied CD or downloaded from the Texas Instruments Web site at www.ti.com .
WARNINGThis EVM has a white LED that flashes very bright. Protective eyewear and/or a diffuser to cover the white LED is recommended.
This section describes the jumpers and connectors on the EVM as well as how to properly connect, setup, and use the TPS61050EVM-215 and TPS61052EVM-215.
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.
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2.1.3 J3 – I
2
C Input
2.1.4 J4 – PULSE GEN / GND
2.1.5 J5 – TRANS RES
2.1.6 J6 – VOUT
2.1.7 J7 – LED
2.1.8 J8 –GND
2.1.9 J9 –FLASH / GND
2.1.10 J10–SCL/SDA
2.1.11 JP1 –I
2
C PULLUP
2.1.12 JP2 –GPIO INPUT or OUTPUT
Setup
This header provides a connection for the included USBTOGPIO interface adapter. The included softwareuses the adapter to communicate with the EVM using the I
2
C protocol.
This header can be used to connect an external pulse generator to drive the gate of transistor Q1.Transistor Q1, along with components R5 - R7, can be used to perform load transient testing and confirmstability.
This header connects to transistor Q1's drain.
This header connects to the IC's VOUT pin. 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's cathode and can be used to measure the high-side WLED voltage.
This header connects to the IC's LED pin. In current regulation mode, it connects to the WLED's 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's ground plane and is the return for the VOUT header.
This header connects to the IC's FLASH pin and GND. It can be used to measure the voltage on theFLASH pin and/or apply an external signal to the FLASH pin.
This header connects to the IC's 1
2
C SCL and SDA control and data lines. It can be used to monitor thedata traffic between the USBTOGPIO adapter and EVM.
This jumper is used to connect the SCL and SDA 15-kohm pull-up resistors to the board's input voltage.This jumper should remain in its default installed position if the USB-TO-GPIO adapter is used to providethe I
2
C interface. If jumper JP1 is uninstalled, then the low side of the jumper must be tied to the externalsource that is powering an alternate I
2
C interface OR R2 and/or R3 must be removed and the SCL andSDA data lines must be pulled up through resistors to that same external source using header J4.
The middle pin of this jumper connects to the GPIO pin on the TPS61050 and the ENVM pin on theTPS61052. If the TPS61050's GPIO pin is configured for input and this jumper is set to INPUT, then theGPIO pin is connected to JP4, which can be jumper connected to either VIN or GND. If the TPS61050'sGPIO pin is configured for output and this jumper is set to OUTPUT, then the GPIO pin is connected toJP3. When shorted, JP3 connects a diode in series with the GPIO output pin. Since the TPS61052'sENVM pin is an input pin, JP2 should be left open to allow for connection to external signal generator orshorted to INPUT. This jumper's default position is uninstalled.
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2.1.13 JP3 –OUTPUT LED
2.1.14 JP4 –INPUT: VIN or GND
2.1.15 JP5 –OPEN LED
2.1.16 S1 –FLASH
2.2 Software Setup
Setup
When shorted, this jumper connects diode D1 in series with the OUTPUT side of JP2. With theTPS61050's GPIO configured for output, the diode turns on when the GPIO output is low. JP2 must beconnected to OUTPUT for this jumper to be effective. This jumper's default position is uninstalled.
The middle pin of this jumper connects the INPUT side of JP2. This jumper is intended to facilitateconnection of either the TPS61050's GPIO, when configured as INPUT, or the TPS61052's ENVM pin toVIN, for a logic high, or GND, for a logic low. JP2 must be connected to INPUT for this jumper to beeffective. This jumper's default position is uninstalled.
This jumper is in series with power WLED, D2. For the WLED to turn on, this jumper must be shorted.Placing an ammeter in series allows the user to measure current. This jumper's default position isinstalled.
This push-button switch connects to the IC's FLASH pin and allows the user to initiate a WLED flashevent.
If installing from a CD, insert the CD and run Setup.exe; follow all the prompts to install the software.
If installing from the TI Web site, go to theURL,http://focus.ti.com/en/download/aap/DesignEnv/TPS6105xEVM-SW/publish.htm
Note: This installation page is best viewed with Microsoft Internet Explorer browser (It may notwork correctly with other browsers)
Click on the install button; your PC should give you a security warning and ask if you want to install thisapplication. Select Install to proceed. If version 22 or older is currently installed on your PC, you mustuninstall this version of the software before installing version 23 or later from either the CD or website.
With both types of installation, the software attempts to install the Microsoft Dot Net Framework 2.0 (if it isnot already installed) This framework is required for the software to run.
After installation, the software should automatically run. To run the software later, go to
Start->all programs-> Texas Instruments, Inc. -> TPS6105x EVM Software.
During future use of the software, it may prompt you to install a new version if one becomes available onthe Web.
Note: VeriSign™ Code Signing is used to prevent any malicious code from changing thisapplication. If at any time in the future the binaries are modified, the code will no longerattempt to run.
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2.3 Hardware Setup
Host
Computer
USB Cable
USB
Interface
Adapter
Green LED
Indicates
Power
10-Pin
Ribbon
Cable
EVM Board
USB Interface Adaptor Quick Connection Diagram
Setup
Table 1 below shows the board's DEFAULT jumper settings.
Table 1. Jumper Settings
JUMPER DEFAULT
JP1 Installed
JP2 Uninstalled
JP3 Uninstalled
JP4 Uninstalled
JP5 Installed
Connect the USB-TO-GPIO adapter to your PC using the supplied USB cable. Connect theTPS61050/2EVM's connector J3 to the USB-TO_GPIO adapter using the supplied 10-pin ribbon cable.The connectors on the ribbon cable are keyed to prevent incorrect installation.
Connect at least a 2-A rated input power supply set to provide between 2.5 V and 6.0 V output to J1 andJ2. The leads should be very short. Additional input capacitance may be required in order to mitigate theinductive voltage droop that occurs at torch current start up and especially when the flash pulse occurs(see figures 5 and 6). Turn on the power supply.
WARNINGThis EVM has a white LED that flashes very brightly. Protective eyewear and/or a diffuser to cover the white LED during operation isrecommended.
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3 Software Setup and Operation
Software Setup and Operation
This section provides descriptions of the EVM software.
The supplied software is used to communicate with the TPS61050/2EVM. Click on the icon on the hostPC to start the software. The host PC software first checks the firmware version of the USB-TO-GPIOadapter box. If an incorrect firmware version is installed, the software automatically searches on theInternet (if connected) for updates. If a new update is available, the software notifies the user of theupdate, downloads and installs the software. Note that after the firmware is updated, the user mustdisconnect and then reconnect the USB cable between the adapter and PC, as instructed during theinstall process. The host PC software automatically searches on the Internet (if connected) for updates. Ifa new update is available, the software notifies the user of the update, downloads and installs the update.
The software then asks which version of the IC is on the board and the desired current limit. Check theapproriate box for the IC, then select the desired current limit, and finally click the continue button.Although the PCB can be powered up after the software is initiated, in order for the user to be able to setthe current limit to a value other than the default, the PCB must be powered on before the software isinitiated.
The software displays the main control panel for the user interface. Figure 1 shows the user interface maincontrol panel.
Figure 1. TPS6105x Software Main Panel
It is recommended that the user press the READ ALL REGISTERS button immediately after loading thesoftware to confirm that the software and cable connections are working properly. The message box at thetop right of the control panel displays whether or not the TPS61050/2 is operational and the middlemessage box at the bottom displays whether or not the USB-TO-GPIO connection s functional.
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4 Test Results
0
10
20
30
40
50
60
70
80
90
2.5 3 3.5 4 4.5 5 5.5
V - Input Voltage - V
I
LED Efficiency (PLED/PIN) - %
ILED = 50 mA
ILED = 200 mA
Test Results
The software itself performs no calculations or computations and simply reads and writes to and from theIC's four registers through the I
2
C interface. Each register's bits can either be changed manually bychanging the buttons corresponding to each bit in the panel's bottom half or they can be changed throughthe drop-down boxes and buttons in the panel's top half. Bits or drop-down boxes that are greyed-out areeither read (display) only or not operational. For example, since the TPS61052 does not have a GPIO pin,the main panel that appears when the user selects the TPS61052 IC has the GPIO related box, buttonand bits greyed-out. Following any change to an individual bit, drop-down box or button, the user mustwrite the new values to the registers by either clicking the red W button to the left of each affected registeror by clicking the WRITE ALL REGISTERS button in the middle of the screen. It is recommended but notrequired that the user click the red R to the left of register or click READ ALL REGISTERS following eachsoftware write to the register or board level change (e.g., pressing S1/S2 to initiate a FLASH event).
Although the data sheet explains each register, the explanation of the functionality of register 2 isreiterated in this user's guide. Writing to the ILIM and STIM bits of register 2 is allowed prior to the firstflash event following the IC's power on. Writing to bits 5 and 6 of register 2 sets the ILIM bits which is theIC's current limit. This current limit value cannot be read back because performing a read of bits 3, 4 and 5of register 2 results in the last valid ADC measurement. For these reasons, even though the IC allowswriting to both ILIM and STIM bits prior to the first flash event, following the IC's the power on, the EVMsoftware only allows the user to set the current limit when the software is initializing, following IC poweron. The current limit drop-down box is greyed-out and only displays the selection previously made andwritten to the IC. In order to change current limit, the IC must be power cycled and the software must beshut down and re-started. Otherwise, on a READ, the current limit drop down box displays the wrongcurrent limit value as bit 5 of register 2, the most significant bit of the ADC value, changes. The inductorinstalled on the EVM has a saturation current of 1.5-A; therefore, the current limit for the EVM as builtshould not be set higher than 1.5 A. Also, a valid ADC measurement is only taken after a FLASH event,either through the board's push-button switch, by clicking the SFT button, followed by a WRITE or byclicking the main panel's START MEASUREMENT button, followed by a WRITE. However, after eachREAD, the software displays the current bits in the ADC register, which is the last valid ADC measurementtaken.
This section provides typical performance waveforms for the TPS61050/2EVM-215 board.
Figure 2. LED Efficiency vs. Input Voltage - Torch Mode
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0
10
20
30
40
50
60
70
80
90
100
2.5 3 3.5 4 4.5 5 5.5
V - Input Voltage - V
I
LED Efficiency (PLED/PIN) - %
ILED = 300 mA
ILED = 700 mA
Test Results
Figure 3. LED Efficiency vs. Input voltage - Single Pulse Flash Mode
Figure 4. Torch Flash Sequence
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Test Results
Figure 5. Start Up in Torch
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0
10
20
30
40
50
60
70
80
90
100
1 10 100 1000
I - Output Current - mA
O
Efficiency - %
V = 3.6 V,
V = 5 V
I
O
Test Results
Figure 6. Inrush Current at Flash
Figure 7. Voltage Mode Efficiency
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5 Board Layout
Board Layout
Figure 8. Voltage Mode Load Transient
This section provides the TPS61050/2EVM-215 board layout and illustrations.
Board layout is critical for all high-frequency, switch-mode power supplies. Figure 9 through Figure 12show the board layout for the TPS61050/2EVM-215 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 datasheet for specific layout guidelines.
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Board Layout
Figure 9. Assembly Layer
Figure 10. Top Layer
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Board Layout
Figure 11. Layer 2
Figure 12. Layer 3
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6 Schematics and Bill of Materials
Schematics and Bill of Materials
Figure 13. Bottom Layer
This section provides the TPS61050/2EVM-215 schematic and bill of materials.
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6.1 Schematics
Schematics and Bill of Materials
Figure 14. TPS61050/2EVM-215 Schematic
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6.2 Bill of Materials
6.3 Related Documentation From Texas Instruments
Schematics and Bill of Materials
Table 2. HPA215 Bill of MaterialsCOUNT
RefDes Value Description Size Part Number MFR-001 -002
1 1 C1 1000pF Capacitor, Ceramic, 50V, X7R, 10% 0603 C1608X7R1H102K TDK
2 2 C2, C3 10 µF Capacitor, Ceramic, 6.3V, X5R, 20% 0603 C1608X5R0J106MT TDK
1 0 D1 Diode, LED, Green, Gullwing, GW Type, 20mA, 0.120 ×0.087 LN1361CTR Panasonic7.5 mcd typ.
1 1 D2 LED, White, 350mA 0.166 ×0.232 LXCL-PWM1 Lumileds
7 7 J1, J2, J6–J10 Header, 2-pin, 100mil spacing, (36-pin strip) 0.100 ×2 PTC36SAAN Sullins
1 1 J3 Connector, Male Straight 2 ×5 pin, 100mil 0.338 ×0.788 2510-6002UB 3Mspacing, 4 Wall
0 0 J4, J5 Header, 2-pin, 100mil spacing, (36-pin strip) 0.100 ×2 PTC36SAAN Sullins
2 2 JP1, JP5 Header, 2-pin, 100mil spacing, (36-pin strip) 0.100 ×2 PTC36SAAN Sullins
1 0 JP3 Header, 2-pin, 100mil spacing, (36-pin strip) 0.100 ×2 PTC36SAAN Sullins
1 1 JP2 Header, 3-pin, 100mil spacing, (36-pin strip) 0.100 ×3 PTC36SAAN Sullins
1 0 JP4 Header, 3-pin, 100mil spacing, (36-pin strip) 0.100 ×3 PTC36SAAN Sullins
1 1 L1 2.2 µH Inductor, SMT, 1.5A, 110 m Ω0.118 ×0.118 LPS3015-222ML Coilcraft
0 0 Q1 Open MOSFET, N-ch SOT23
3 3 R1–R3 15k ΩResistor, Chip, 1/16W, 1% 0603 Std Std
1 0 R4 249 ΩResistor, Chip, 1/16W, 1% 0603 Std Std
0 0 R5, R6 Open Resistor, Chip, 1/16W, 1% 0603
0 0 R7 Open Resistor, Chip, 1W, 1% 2512
1 1 S1 Switch, SPST, PB Momentary, Sealed 0.245 ×0.251 KT11P2JM C & KWashable
1 0 U1 SON-10 TPS61050DRC TIIC, Synchronous Boost Converter With I
2
CCompatible Interface High Power White LEDDriver
0 1 U1 SON-10 TPS61052DRC TIIC, Synchronous Boost Converter With I
2
CCompatible Interface High Power White LEDDriver
1 1 – PCB, 3.35 In ×1.9 In ×0.062 In HPA215 Any
5 3 – Shunt, 100-mil, Black 0.100 929950-00 3M
TPS61050, I
2
C™ Compatible Interface in Chip Scale Packaging data sheet (SLUS525 )
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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 2.7 V to 6 V and the output voltage range of Vin to 5.5 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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