Texas Instruments TPS62351EVM User manual

User's GuideSLVU186 – October 2006
TPS62351EVM
This User’s Guide describes the characteristics, operation, and use of theTPS62351EVM-122 Evaluation Module (EVM). This EVM demonstrates the TexasInstruments TPS62351 800 mA, 3 MHz, synchronous, step down converter with I
2
C™interface. This User’s Guide includes setup instructions, a schematic diagram, a bill ofmaterials (BOM), and PCB layout drawings for the evaluation module.
Contents1 Introduction .......................................................................................... 22 Setup ................................................................................................. 23 Operation ............................................................................................ 64 Test Results ......................................................................................... 95 Board Layout ...................................................................................... 126 Schematic and Bill of Materials ................................................................. 18
List of Figures
1 Quick Connection Diagram USB Interface Adapter ............................................ 62Output Controls Tab ................................................................................ 73Preferences Tab .................................................................................... 84 Start Up From Software Enable .................................................................. 95 Output Ripple ..................................................................................... 106 Load Transient, 0 mA to 680 mA Step ......................................................... 117 Load Transient, 680 mA to 0 mA Step ......................................................... 128 Assembly Layer ................................................................................... 139 Top Layer Routing ................................................................................ 1410 Bottom Layer Routing ............................................................................ 1511 Layer 2 Routing ................................................................................... 1612 Layer 3 Routing ................................................................................... 1713 TPS62351EVM-122 Schematic ................................................................. 18
List of Tables
1 HPA122A BOM .................................................................................... 19
Windows2000, WindowsXP are trademarks of Microsoft Corporation.I
2
C is a trademark of Philips Electronics.
SLVU186 – October 2006 TPS62351EVM 1Submit Documentation Feedback

www.ti.com
1 Introduction
1.1 Requirements
1.1.1 Personal Computer Requirements
1.1.2 Printed circuit board assembly
1.1.3 USB Interface Adapter
1.1.4 Software
2 Setup
2.1 Input/Output Connector Descriptions
2.1.1 J1 –VIN Converter 1
2.1.2 J2 – GND Converter 1
2.1.3 J3 – I
2
C™ Input Converter 1
Introduction
To operate this EVM properly, the user must connect and properly configure the following components.
A computer with a USB port is required to operate this EVM. The TPS62351 interface software runs onthe PC and communicates with the EVM via the PC’s USB port. The user can send commands to theinternal registers of the TPS62351 through the USB port.
•Windows2000™ or WindowsXP™ operating System•USB port•Minimum of 30 MB of free hard disk space (100 MB recommended)•Minimum of 256 MB of RAM
The TPS62351EVM-122 PCB contains the TPS62351 IC and its required external components. Thisboard contains several jumpers and connectors that enable the user to customize the board forspecific operating conditions.
The USB Interface Adapter is the link that allows the PC and the EVM to communicate. One end of theUSB 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 writing a command to the EVM, the interface program running on the PC sends the commandsto the PC USB port. The USB Interface Adapter receives the USB command, converts the signal to anI
2
C™ protocol, and sends the I
2
C™ signal to the TPS62351 EVM board.
Texas Instruments has provided software to assist the user in evaluating this EVM. The software canbe installed from the supplied CD or downloaded from the web at www.ti.com .
This section describes the jumpers and connectors on the EVM as well as how to properly connect, setup,and use the TPS62351EVM-122.
This is the positive input supply voltage to converter 1. The leads to the input supply should be twistedand kept as short as possible to minimize EMI transmission.
This is the return connection for the input power supply of converter 1.
This connector is the I
2
C™ input for converter 1.
TPS62351EVM 2 SLVU186 – October 2006Submit Documentation Feedback

www.ti.com
2.1.4 J4 –VIN Converter 2
2.1.5 J5 – GND Converter 2
2.1.6 J6 – I
2
C™ Input Converter 2
2.1.7 J7 – VOUT Converter 1
2.1.8 J8 – GND Converter 1
2.1.9 J9 –VOUT Converter 2
2.1.10 J10 – GND Converter 2
2.1.11 J11 – SYNC INPUT Converter 2
2.1.12 JP1 –SDA Converter 1
2.1.13 JP2 – SDA Converter 2
Setup
This is the positive input supply voltage to converter 2. The leads to the input supply should be twisted,and kept as short as possible to minimize EMI transmission.
This is the return connection for the input power supply of converter 2.
This connector is the I
2
C™ input for converter 2.
This is the positive connection for the output of converter 1. Connect this pin to the positive input of theload.
This is the return connection for the output of converter 1.
This is the positive connection for the output of converter 2. Connect this pin to the positive input of theload.
This is the return connection for the output of converter 2.
This connector is used to synchronize the switching of the TPS62351 to an external clock source. Pin 1 ofJ4 connects to the SYNC pin of the TPS62351 on converter 2. Pin 2 of J4 is connected to the ground ofthe TPS62351 on converter 2. The SYNC input has a 1-m Ωpull-down resistor installed on the EVM board.
This jumper is used to tie the I
2
C™ SDA pin of the TPS62351 to either a 10-k Ωpull-up resistor to theinput voltage or to short the SDA pin to ground. The shunt can be removed if the I
2
C™ master has its ownpull up or operates from a voltage that is different than the input voltage of the TPS62351. The TexasInstruments USB Interface Adapter provides an active pull up so no jumper should be installed when usingthe adapter supplied with the EVM.
This jumper is used to tie the I
2
C™ SDA pin of the TPS62351 to either a 10-k Ωpull-up resistor to theinput voltage or to short the SDA pin to ground. The shunt can be removed if the I
2
C™ master has its ownpull up or operates from a voltage that is different than the input voltage of the TPS62351. The TexasInstruments USB Interface Adapter provides an active pull up so no jumper should be installed when usingthe adapter supplied with the EVM.
SLVU186 – October 2006 TPS62351EVM 3Submit Documentation Feedback

www.ti.com
2.1.14 JP3 – SCL Converter 1
2.1.15 JP4 – SCL Converter 2
2.1.16 JP5 –ENABLE Converter 1
2.1.17 JP6 –VSEL Converter 2
2.1.18 JP7 –VSEL Converter 1
2.1.19 JP8 – ENABLE Converter 2
2.2 Software Setup
Setup
This jumper is used to tie the I
2
C™ SCL pin of the TPS62351 to either a 10-k Ωpull-up resistor to the inputvoltage or to short SCL to ground. The shunt can be removed if the I
2
C™ master has its own pull up oroperates from a voltage that is different than the input voltage of the TPS62351. The Texas InstrumentsUSB Interface Adapter provides an active pull up so no jumper should be installed when using the adaptersupplied with the EVM.
This jumper is used to tie the I
2
C™ SCL pin of the TPS62351 to either a 10-k Ωpull-up resistor to the inputvoltage or to short SCL to ground. The shunt can be removed if the I
2
C™ master has its own pull up oroperates from a voltage that is different than the input voltage of the TPS62351. The Texas InstrumentsUSB Interface Adapter provides an active pull up so no jumper should be installed when using the adaptersupplied with the EVM.
This jumper enables or disables the converter. Connect the shorting jumper from the center ENABLE pinto either the ON or OFF position. This pin should never be left floating.
This jumper is used to select the output voltage of the converter. Placing a shunt between pins 1 and 2(HIGH and VSEL) sets the output voltage of the converter to the voltage defined by the internal VSEL1register. Placing a shunt between pins 2 and 3 (VSEL and LOW) sets the output voltage of the converterto the voltage defined by the internal VSEL0 register.
This jumper is used to select the output voltage of the converter. Placing a shunt between pins 1 and 2(HIGH and VSEL) sets the output voltage of the converter to the voltage defined by the internal VSEL1register. Placing a shunt between pins 2 and 3 (VSEL and LOW) sets the output voltage of the converterto the voltage defined by the internal VSEL0 register.
This jumper enables or disables the converter. Connect the shorting jumper from the center ENABLE pinto either the ON or OFF position. This pin should never be left floating.
If installing from a CD, insert the CD and run Setup.exe, follow all the prompts to allow the software to beinstalled.
If installing from the web, go to the following URL www.ti.com .
Note: this installation page is best viewed with Microsoft Internet Explorer browser (It may not workcorrectly with other browsers).
Click on the install button, the pc should give a security warning to the user, and ask if the user wants toinstall this application, select Install to proceed.
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.
During future use of the software, it may prompt the user to install a new version if it becomes available onthe web.
4TPS62351EVM SLVU186 – October 2006Submit Documentation Feedback

www.ti.com
2.3 Hardware Setup Converter 1 (upper board)
2.4 Hardware Setup Converter 2 (lower board)
2.5 Hardware Setup Connection to Host Computer (upper or lower board)
Setup
Note: Verisign code signing is used to prevent any malicious code from changing this application. If at anytime in the future the binaries are modified the code will no longer attempt to run.
Configure JP1, JP3, JP5 and JP7 using a shorting block. Jumpers JP1 and JP3 are used to connect theSDA and SCL lines of the I
2
C™ interface to a pull-up resistor to the input voltage. The USB InterfaceAdapter supplied with the EVM has its own internal pull-up resistors. Jumpers JP1 and JP3 should be leftopen with no jumper installed when using the USB Interface Adapter supplied with the EVM.
Configure the jumper on JP7 to the desired setting. Shorting between VSEL and HIGH (pin 1 and 2)makes the TPS62351 power up with the output voltage set by the VSEL1 register. Shorting betweenVSEL and LOW (pin 2 and 3) makes the TPS62351 power up with the output voltage set by the VSEL0register.
Configure JP5 as desired. Shorting between EN and ON (pin 1 and 2) enables the TPS62351. Shortingbetween EN and OFF (pin 2 and 3) disables the TPS62351. The EN pin must be tied high (enabled) inorder to establish communications with the IC via the I
2
C™ interface. The TPS62351 powers up with thedevice disabled no matter how JP5 is set. The software must enable the TPS62350 in order to produce avoltage at the output.
Configure JP2, JP4, JP6 and JP8 using a shorting block. These jumpers are used to connect the SDA andSCL lines of the I
2
C™ interface to a pull-up resistor to the input voltage. The USB Interface Adaptersupplied with the EVM has its own internal pull-up resistors so no additional pull-up is required. No jumperis necessary if the Texas Instruments USB Interface Adapter is used to communicate with theTPS62351EVM board and JP2 and JP4 should be left open.
Configure the jumper on JP6 to the desired setting. Shorting between VSEL and HIGH (pin 1 and 2)makes the TPS62351 power up with the output voltage set by the VSEL1 register. Shorting betweenVSEL and LOW (pin 2 and 3) makes the TPS62351 power up with the output voltage set by the VSEL0register.
Configure JP8 as desired. Shorting between EN and ON (pin 1 and 2) enables the TPS62351. Shortingbetween EN and OFF (pin 2 and 3) disables the TPS62351. The EN pin must be tied high (enabled) inorder to establish communications with the IC via the I
2
C™ interface. The TPS62351 powers up with thedevice disabled no matter how JP8 is set. The software must enable the TPS62350 in order to produce avoltage at the output.
Connect the USB Interface Adapter to the host computer using the supplied USB cable. Connect thedesired converter on the TPS62351EVM board to the USB Interface Adapter using the supplied 10 pinribbon cable. The connectors on the ribbon cable are keyed to prevent incorrect installation.
SLVU186 – October 2006 TPS62351EVM 5Submit Documentation Feedback

www.ti.com
Host
Computer
USB Cable
Green LED
Indicates
Power
EVM Board
10 Pin Ribbon
Cable
USB
Interface
Adapter
3 Operation
3.1 Operation
Operation
Figure 1. Quick Connection Diagram USB Interface Adapter
Connect an input voltage supply to the TPS62351EVM board. The TPS62351 uses an input voltagebetween 2.7 V and 5.5 V. Connect the positive input voltage to J1 for converter 1 or J4 for converter 2.Connect the input voltage return (ground) connection to J2 for converter 1 or J5 for converter 2.
This section provides descriptions of the EVM Software.
The supplied software is used to communicate with the TPS62351 EVM. Click on the icon on the hostcomputer to start the software. If there is no icon on the host computer then use the start button in thelower left hand corner of the screen to browse the program folders to find the software. Once started, thesoftware will ask which version of the IC is on the board. Check the TPS62351 box and click the continuebox. The software displays the main control panel for the user interface. When initialized, the hostcomputer software automatically searches the internet (if connected) for updates. If a new update isavailable, the software will notify the user of the update, and downloads the update.
The main control panel for the user interface has three main page tabs, EVM Configuration,OutputControls and Preferences. The software will initialize with the EVM Configuration tab selected. This pagecan be used to set register values that correspond to the hardware configuration of the EVM. The EVMcan be operated with the default values.
Figure 2 shows the user interface with the Output Control tab selected. The TPS62351 powers up with theoutput disabled no matter how ENABLE jumper is configured. The ENABLE jumper must be set toENABLED in order for the TPS62351EVM software to communicate with the IC. Once the ENABLEjumper is set to ENABLE, the software can be used to turn on the output of the converter. Push theEN_DCDC button on the Output Control tab to turn the output of the converter on.
The Output Control tab is used to change the output voltage of the TPS62351 via the register settings.The page has two pull down boxes, one for VSEL0 and one for VSEL1, with the available output voltage.The voltages listed in the boxes assume PWM mode of operation, so the actual output voltage of the EVMvaries from the listed values at light loads.
6TPS62351EVM SLVU186 – October 2006Submit Documentation Feedback

www.ti.com
Control Panel Tabs “Output
Controls” selected
Output Voltage Selection Pull
Down Boxes
TPS62350 Internal Register Values. Can be
altered bit by bit if desired. Will update register
when “Write” button is pushed.
Operation
Figure 2. Output Controls Tab
Figure 3 shows the page of the Preference tab. The Preferences page is used to change the look of theuser interface such as the text color or the color of the boxes used to display a logic one or zero in theregister displays. The preference page also provides an option for cross linking the values in the VSEL0and VSEL1 registers within a selectable percentage. The default is no cross linking. If cross linking isenabled then the difference between VSEL0 and VSEL1 cannot exceed the selected percentage. Thisfeature provides a method to limit the ratio of voltages that can be selected. This can be used to avoidinadvertently selecting output voltages, in the output voltage pull down boxes, that are too high for theapplication being tested.
SLVU186 – October 2006 TPS62351EVM 7Submit Documentation Feedback

www.ti.com
Cross Link enable and delta selection
Operation
Figure 3. Preferences Tab
All three tabs show the bit representation of all four internal registers of the TPS62351. These bits can beindividually altered by clicking on them. Clicking on a bit does not immediately change the register value ofthe IC. The Write button must be pushed to update the register with the newly selected bit values. Eachregister display has its own Write button that will only update the register that is displayed next to it. TheWrite To All Registers button will update all four registers with one push.
TPS62351EVM 8 SLVU186 – October 2006Submit Documentation Feedback

www.ti.com
4 Test Results
VOUT
SCL pin
20μs/div
Vin=3.6V
VOUT=1.1V
Iout=550mA
1.0V/div
500mV/div
status
8/25/2006 9:33:22 AM
X1 = 104.747 s X = 36.636 sm D m
X2 = 141.383 s 1/ X = 27.2956 kHzm D
P5. . .
value
Measure P1. . . P2freq(C1)
114.295 kHz
P4. . . P6. . .P3. . .
Test Results
This section provides typical performance waveforms for the TPS62351EVM-122 board.
Figure 4. Start Up From Software Enable
SLVU186 – October 2006 TPS62351EVM 9Submit Documentation Feedback

www.ti.com
100ns/div
Vin=3.6V
VOUT=1.1V
Iout=550mA
VOUT
SW pin
1.0V/div
10mV/div
status
8/25/2006 9:40:53 AM
X1 = 80.499 s X = 0 nsm D
X2 = 80.499 s 1/ X = ---m D
P5. . .
value
Measure P1. . . P2freq(C1)
2.93117 kHz
P4. . . P6. . .P3. . .
Test Results
Figure 5. Output Ripple
10 TPS62351EVM SLVU186 – October 2006Submit Documentation Feedback

www.ti.com
Load Current
VOUT
20µs/div
Vin=3.6V
VOUT=1.50
VSEL=High, Forced PWM
0mA
680mA
20mV/div
500mA/div
status
8/25/2006 10:05:32 AM
X1 = 134.7995 s X = 0.0 nsm D
X2 = 134.7995 s 1/ X = ---m D
P5. . .
value
Measure P1. . . P2freq(C1)
2.908651 MHz
P4. . . P6. . .P3. . .
Test Results
Figure 6. Load Transient, 0 mA to 680 mA Step
SLVU186 – October 2006 TPS62351EVM 11Submit Documentation Feedback

www.ti.com
VOUT
IOUT 0mA
680mA
20µs/div
Vin=3.6V
VOUT=1.5V
Vsel.=high, forced PWM
20mV/div
500mA/div
status
8/25/2006 10:06:17 AM
X1 = 134.7995 s X = 0.0 nsm D
X2 = 134.7995 s 1/ X = ---m D
P5. . .
value
Measure P1. . . P2freq(C1)
9.7641 MHz
P4. . . P6. . .P3. . .
5 Board Layout
5.1 Layout
Board Layout
Figure 7. Load Transient, 680 mA to 0 mA Step
This section provides the TPS62351EVM-122 board layout and illustrations.
Board layout is critical for all high frequency switch mode power supplies. Figure 8 through Figure 11 showthe board layout for the TPS62351EVM-122 PWB. 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 the specific layout guidelines.
12 TPS62351EVM SLVU186 – October 2006Submit Documentation Feedback

www.ti.com
Board Layout
Figure 8. Assembly Layer
SLVU186 – October 2006 TPS62351EVM 13Submit Documentation Feedback

www.ti.com
Board Layout
Figure 9. Top Layer Routing
14 TPS62351EVM SLVU186 – October 2006Submit Documentation Feedback

www.ti.com
Board Layout
Figure 10. Bottom Layer Routing
SLVU186 – October 2006 TPS62351EVM 15Submit Documentation Feedback

www.ti.com
Board Layout
Figure 11. Layer 2 Routing
16 TPS62351EVM SLVU186 – October 2006Submit Documentation Feedback

www.ti.com
Board Layout
Figure 12. Layer 3 Routing
SLVU186 – October 2006 TPS62351EVM 17Submit Documentation Feedback

www.ti.com
6 Schematic and Bill of Materials
6.1 Schematic
Schematic and Bill of Materials
This section provides the TPS62351EVM-122 schematic and bill of materials.
Figure 13. TPS62351EVM-122 Schematic
TPS62351EVM 18 SLVU186 – October 2006Submit Documentation Feedback

www.ti.com
6.2 Bill of Materials
6.3 Related Documentation From Texas Instruments
Schematic and Bill of Materials
Table 1. HPA122A BOMCOUNT RefDes Value Description Size Part Number MFR
4 C1, C2, C5, C7 10uF Capacitor, Ceramic, 6.3V, XR5, 10% 0603 C1608X5R0J106KT TDK
2 C3, C4 47uF Capacitor, Ceramic, 10V, XR5, 20% 1812 C4532X5R1A476M TDK
0 C6, C8 Open Capacitor, Ceramic, vvV 0603
J1, J2, J4, J5,9 Header, 2 pin, 100mil spacing, (36-pin strip) 0.100 x 2 PTC36SAAN SullinsJ7 - J11
Connector, Male Straight 2x10 pin, 100mil2 J3, J6 0.338 x 0.788 2510-6002UB 3Mspacing, 4 Wall
8 JP1 - JP8 Header, 3 pin, 100mil spacing, (36-pin strip) 0.100 x 3 PTC36SAAN Sullins
2 L1, L2 1.0uH Inductor, SMT, 1.6A, ±30% 0.118 x 0.118 LPS3010-102NLC Coilcraft
4 R1 - R4 10.0k Resistor, Chip, 1/16W, 1% 0603 Std Std
1 R5 1.00M Resistor, Chip, 1/16W, 1% 0603 Std Std
IC, 3MHz Synchronous Step Down Converter1 U1 QFN-10 TPS62351DRC TIwith I
2
C 800mA
IC, 3MHz Synchronous Step Down Converter1 U2 QFN-12 TPS62351YZG TIwith I
2
C 800mA
1 -- PCB, 4.15 In x 3.45 In x 0.062 In HPA122 Any
8 -- Shunt, 100 mil, Black 0.100 929950-00 3M
TPS62351 data sheet (SLVS540 )
SLVU186 – October 2006 TPS62351EVM 19Submit 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 EVALUATIONPURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling theproduct(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided arenot 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 semiconductorcomponents or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regardingelectromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet thetechnical 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 30days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BYSELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDINGANY WARRANTY OF MERCHANTABILITY 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 allclaims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility totake any and all appropriate precautions with regard to electrostatic discharge.EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHERFOR ANY INDIRECT, 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 ofpatents 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 theproduct. This notice contains important safety information about temperatures and voltages. For additional information on TI’senvironmental 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, 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 EVALUATIONPURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, andcan radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of thisequipment in other environments may cause interference with radio communications, in which case the user at his own expensewill be required to take whatever measures may be required to correct this interference.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265Copyright © 2006, Texas Instruments Incorporated
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 2.7 V to 5.5 V and the output voltage range of 0.9 V to 1.6875V.
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there arequestions 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 theEVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the loadspecification, please contact a TI field representative.During normal operation, some circuit components may have case temperatures greater than 85°C. The EVM is designed tooperate properly with certain components above 85°C as long as the input and output ranges are maintained. These componentsinclude but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types ofdevices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes nearthese devices during operation, please be aware that these devices may be very warm to the touch.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265Copyright © 2006, Texas Instruments Incorporated