LMZ20501EVM

User's Guide SNVU181 – February 2012 LMZ20502 SIMPLE SWITCHER® Evaluation Board 1 Introduction The LMZ20501/02 nano modules are easy-to-use DC-DC converters optimized for space-constrained applications. The LMZ20502 is capable of delivering up to 2A with excellent power conversion efficiency, output voltage accuracy, line and load regulation, and load transient response. The LMZ20501 is a 1.0A version, that is pin-to-pin compatible with the LMZ20502. This engineering evaluation board is designed for rapid prototyping with large pads and extra components. In addition, jumpers are provided to allow the user to enable the converter and select the operating mode. A jumper for connecting a network analyzer is also provided, to measure regulator loop response. Please refer to Figure 1 for the schematic of the EVM. 2 Specifications • • • • • VIN = 2.7V to 5.5V VOUT = 1.8V IOUT = 1A (LMZ20501) IOUT = 2A (LMZ20502) 2.7cm x 6.4 cm overall PCB size Figure 1. EVM Schematic SNVU181 – February 2012 Submit Documentation Feedback LMZ20502 SIMPLE SWITCHER® Evaluation Board Copyright © 2012, Texas Instruments Incorporated 1 Set-Up and Operation 3 www.ti.com Set-Up and Operation Please refer to Figure 2 through Figure 5 while setting up the EVM module. All that is required is to apply an input supply to the module, connect the desired load and select the enable and mode jumper positions. The input supply is connected between the VIN and GND pins. The load is connected between the VOUT and GND pins. The output voltage can be monitored between the VOUTS and GNDS pins, or at the test points provided on the module. Figure 2 shows the enable jumper configuration; the left side of the figure shows the jumper in the "ON" position. While the right side of the figure shows the "OFF" position. Figure 3 shows the MODE selection jumpers. With the jumper in the "PFM" position, the device will automatically switch between PFM and PWM mode depending on load. With the jumper in the "PWM" position, the part will remain in constant frequency PWM mode regardless of load. To remotely enable the module, remove the EN jumper and connect the control signal to the EN pad on the edge connector. A valid input voltage must be present on VIN before the EN pin is asserted. The maximum voltage on this pin is 5.5V or VIN, whichever is smaller. A three pin header is provided to allow the user to inject a signal from a network analyzer into the control loop of the regulator. The connections are shown in Figure 4 The expected input current to the module can be approximated by using Equation 1 VOUT ˜ IOUT IIN VIN ˜ K (1) In some cases an electrolytic capacitor may be required on the input to the module. This is especially true if long leads/traces are used to connect the input supply to the device. The moderate ESR of this capacitor can help to damp any ringing on the input supply caused by long power leads. A value of about 100µF is usually adequate. EN JUMPER EN JUMPER OFF POSITION ON POSITION Figure 2. EN Jumper Configuration 2 LMZ20502 SIMPLE SWITCHER® Evaluation Board Copyright © 2012, Texas Instruments Incorporated SNVU181 – February 2012 Submit Documentation Feedback Set-Up and Operation www.ti.com MODE JUMPER MODE JUMPER AUTO POSITION FPWM POSITION Figure 3. MODE Jumper Configuration To Network Analyzer V1 OSC V2 To Network Analyzer Figure 4. Frequency Response Analyzer Connections SNVU181 – February 2012 Submit Documentation Feedback LMZ20502 SIMPLE SWITCHER® Evaluation Board Copyright © 2012, Texas Instruments Incorporated 3 Typical Performance 3.1 www.ti.com Edge Connector Description VIN– Input supply to the module. Connect the supply from these pins to GND. Apply a voltage of between 2.7V and 5.5V from a supply that is capable of providing the required input current. GND– Ground connection for the module. VOUT– Output voltage connection. The user load should be connected between these pins and GND. EN– Remote enable input of the converter. Remove the EN jumper and connect a control signal to this pin to remotely enable the converter. VINS– Input voltage sense pin. For accurate input voltage measurements, the DMM should be connected between this pin and GNDS. GNDS–Ground sense for all voltage measurements. VOUTS– Output voltage sense pin. For accurate output voltage measurements, the DMM should be connected between this pin and GNDS. RTD– A 100Ω RTD is connected from this pin to GNDS. It can be used to measure the temperature of the bottom of the board, if desired. TOP FRONT VIN EN GND VINS GNDS VOUT VOUTS RTD BOTTOM FRONT Figure 5. Edge Connector Layout 4 Typical Performance Figure 6 through Figure 11 shows examples of typical performance curves. These curves are applicable to the circuit and components found in Figure 1 and are not guaranteed. The EMI results are valid for this EVM only and will depend on the physical layout of the board and its connections. 100 1.810 3V 4.2V 5V 95 90 1.805 Output Voltage (V) Efficiency (%) 85 80 75 70 65 60 55 45 40 0.01 0.1 1 Output Current (A) Figure 6. Efficiency, VOUT=1.8V AUTO MODE 4 1.795 1.790 3V 4.2V 5V 50 1.800 1.785 10 0.0 0.5 1.0 1.5 2.0 Output Current (A) C001 2.5 C003 Figure 7. Regulation, AUTO MODE LMZ20502 SIMPLE SWITCHER® Evaluation Board Copyright © 2012, Texas Instruments Incorporated SNVU181 – February 2012 Submit Documentation Feedback Typical Performance www.ti.com 1.2 2.5 1.0 Output Current (A) Output Current (A) 2.0 1.5 1.0 1.2V 1.8V 3.3V 0.5 0.0 40 50 60 0.8 0.6 0.4 1.2V 1.8V 3.3V 0.2 0.0 70 80 90 100 110 40 120 130 140 Ambient Temperature (ƒC) 50 Figure 8. Maximum Output Current vs. Ambient Temperature for LMZ20502 θJA=44°C/W, Vin = 5V 60 70 80 90 100 110 120 130 140 Ambient Temperature (C) C001 C001 Figure 9. Maximum Output Current vs. Ambient Temperature for LMZ20501 θJA=44°C/W, Vin = 5V LMZ20502 Radiated EMI 10 Meter Chamber, Class B Vin = 4.7V, Vout= 2.5V, Iout = 1A 50 45 40 35 dBuV 30 25 20 15 10 5 0 10 100 1000 Frequency (MHz) Figure 10. Radiated EMI, CISPR22, VOUT = 2.5V, VIN = 4.7V, IOUT = 1A SNVU181 – February 2012 Submit Documentation Feedback LMZ20502 SIMPLE SWITCHER® Evaluation Board Copyright © 2012, Texas Instruments Incorporated 5 Typical Performance www.ti.com LMZ20502 Radiated EMI 10 Meter Chamber , Class B Vin = 4.7V, Vout = 2.5V, Iout = 2A 50 45 40 35 dBuV 30 25 20 15 10 5 0 10 100 1000 Frequency (MHz) Figure 11. Radiated EMI, CISPR22, VOUT = 2.5V, VIN = 4.7V, IOUT = 2A 6 LMZ20502 SIMPLE SWITCHER® Evaluation Board Copyright © 2012, Texas Instruments Incorporated SNVU181 – February 2012 Submit Documentation Feedback Board Layout www.ti.com 5 Board Layout Figure 12 and Figure 13 show plots of the EVM PCB. The outer layers are two oz. copper; the inner layers are one oz. copper. Figure 12. Top Metal of EVM SNVU181 – February 2012 Submit Documentation Feedback Figure 13. Bottom Metal of EVM LMZ20502 SIMPLE SWITCHER® Evaluation Board Copyright © 2012, Texas Instruments Incorporated 7 Bill Of Materials 6 www.ti.com Bill Of Materials Figure 14 shows the BOM for the EVM module. Figure 14. EVM BOM 8 LMZ20502 SIMPLE SWITCHER® Evaluation Board Copyright © 2012, Texas Instruments Incorporated SNVU181 – February 2012 Submit Documentation Feedback STANDARD TERMS AND CONDITIONS FOR EVALUATION MODULES 1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, or documentation (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance with the terms and conditions set forth herein. Acceptance of the EVM is expressly subject to the following terms and conditions. 1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions set forth herein but rather shall be subject to the applicable terms and conditions that accompany such Software 1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned, or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production system. 2 Limited Warranty and Related Remedies/Disclaimers: 2.1 These terms and conditions do not apply to Software. The warranty, if any, for Software is covered in the applicable Software License Agreement. 2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM to User. Notwithstanding the foregoing, TI shall not be liable for any defects that are caused by neglect, misuse or mistreatment by an entity other than TI, including improper installation or testing, or for any EVMs that have been altered or modified in any way by an entity other than TI. Moreover, TI shall not be liable for any defects that result from User's design, specifications or instructions for such EVMs. Testing and other quality control techniques are used to the extent TI deems necessary or as mandated by government requirements. TI does not test all parameters of each EVM. 2.3 If any EVM fails to conform to the warranty set forth above, TI's sole liability shall be at its option to repair or replace such EVM, or credit User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the warranty period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to repair or replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall be warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day warranty period. 3 Regulatory Notices: 3.1 United States 3.1.1 Notice applicable to EVMs not FCC-Approved: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software associated with the kit to determine whether to incorporate such items in a finished product and software developers to write software applications for use with the end product. This kit is not a finished product and when assembled may not be resold or otherwise marketed unless all required FCC equipment authorizations are first obtained. Operation is subject to the condition that this product not cause harmful interference to licensed radio stations and that this product accept harmful interference. Unless the assembled kit is designed to operate under part 15, part 18 or part 95 of this chapter, the operator of the kit must operate under the authority of an FCC license holder or must secure an experimental authorization under part 5 of this chapter. 3.1.2 For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant: CAUTION This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. FCC Interference Statement for Class A EVM devices NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense. SPACER SPACER SPACER SPACER SPACER SPACER SPACER SPACER FCC Interference Statement for Class B EVM devices NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: • • • • Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. 3.2 Canada 3.2.1 For EVMs issued with an Industry Canada Certificate of Conformance to RSS-210 Concerning EVMs Including Radio Transmitters: This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. Concernant les EVMs avec appareils radio: Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes: (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement. Concerning EVMs Including Detachable Antennas: Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication. This radio transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device. Concernant les EVMs avec antennes détachables Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante. Le présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le manuel d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne non inclus dans cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur 3.3 Japan 3.3.1 Notice for EVMs delivered in Japan: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_01.page 日本国内に 輸入される評価用キット、ボードについては、次のところをご覧ください。 http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_01.page 3.3.2 Notice for Users of EVMs Considered “Radio Frequency Products” in Japan: EVMs entering Japan may not be certified by TI as conforming to Technical Regulations of Radio Law of Japan. If User uses EVMs in Japan, not certified to Technical Regulations of Radio Law of Japan, User is required by Radio Law of Japan to follow the instructions below with respect to EVMs: 1. 2. 3. Use EVMs in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for Enforcement of Radio Law of Japan, Use EVMs only after User obtains the license of Test Radio Station as provided in Radio Law of Japan with respect to EVMs, or Use of EVMs only after User obtains the Technical Regulations Conformity Certification as provided in Radio Law of Japan with respect to EVMs. Also, do not transfer EVMs, unless User gives the same notice above to the transferee. Please note that if User does not follow the instructions above, User will be subject to penalties of Radio Law of Japan. SPACER SPACER SPACER SPACER SPACER 【無線電波を送信する製品の開発キットをお使いになる際の注意事項】 開発キットの中には技術基準適合証明を受けて いないものがあります。 技術適合証明を受けていないもののご使用に際しては、電波法遵守のため、以下のいずれかの 措置を取っていただく必要がありますのでご注意ください。 1. 2. 3. 電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用 いただく。 実験局の免許を取得後ご使用いただく。 技術基準適合証明を取得後ご使用いただく。 なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。 上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。 日本テキサス・イ ンスツルメンツ株式会社 東京都新宿区西新宿６丁目２４番１号 西新宿三井ビル 3.3.3 Notice for EVMs for Power Line Communication: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page 電力線搬送波通信についての開発キットをお使いになる際の注意事項については、次のところをご覧くださ い。http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page SPACER 4 EVM Use Restrictions and Warnings: 4.1 EVMS ARE NOT FOR USE IN FUNCTIONAL SAFETY AND/OR SAFETY CRITICAL EVALUATIONS, INCLUDING BUT NOT LIMITED TO EVALUATIONS OF LIFE SUPPORT APPLICATIONS. 4.2 User must read and apply the user guide and other available documentation provided by TI regarding the EVM prior to handling or using the EVM, including without limitation any warning or restriction notices. The notices contain important safety information related to, for example, temperatures and voltages. 4.3 Safety-Related Warnings and Restrictions: 4.3.1 User shall operate the EVM within TI’s recommended specifications and environmental considerations stated in the user guide, other available documentation provided by TI, and any other applicable requirements and employ reasonable and customary safeguards. Exceeding the specified performance ratings and specifications (including but not limited to input and output voltage, current, power, and environmental ranges) for the EVM may cause personal injury or death, or property damage. If there are questions concerning performance ratings and specifications, User should contact a TI field representative prior to connecting interface electronics including input power and intended loads. Any loads applied outside of the specified output range may also result in unintended and/or inaccurate operation and/or possible permanent damage to the EVM and/or interface electronics. Please consult the EVM user 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, even with the inputs and outputs kept within the specified allowable ranges, some circuit components may have elevated case temperatures. These components include but are not limited to linear regulators, switching transistors, pass transistors, current sense resistors, and heat sinks, which can be identified using the information in the associated documentation. When working with the EVM, please be aware that the EVM may become very warm. 4.3.2 EVMs are intended solely for use by technically qualified, professional electronics experts who are familiar with the dangers and application risks associated with handling electrical mechanical components, systems, and subsystems. User assumes all responsibility and liability for proper and safe handling and use of the EVM by User or its employees, affiliates, contractors or designees. User assumes all responsibility and liability to ensure that any interfaces (electronic and/or mechanical) between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to minimize the risk of electrical shock hazard. User assumes all responsibility and liability for any improper or unsafe handling or use of the EVM by User or its employees, affiliates, contractors or designees. 4.4 User assumes all responsibility and liability to determine whether the EVM is subject to any applicable international, federal, state, or local laws and regulations related to User’s handling and use of the EVM and, if applicable, User assumes all responsibility and liability for compliance in all respects with such laws and regulations. User assumes all responsibility and liability for proper disposal and recycling of the EVM consistent with all applicable international, federal, state, and local requirements. 5. Accuracy of Information: To the extent TI provides information on the availability and function of EVMs, TI attempts to be as accurate as possible. However, TI does not warrant the accuracy of EVM descriptions, EVM availability or other information on its websites as accurate, complete, reliable, current, or error-free. SPACER SPACER SPACER SPACER SPACER SPACER SPACER 6. Disclaimers: 6.1 EXCEPT AS SET FORTH ABOVE, EVMS AND ANY WRITTEN DESIGN MATERIALS PROVIDED WITH THE EVM (AND THE DESIGN OF THE EVM ITSELF) ARE PROVIDED "AS IS" AND "WITH ALL FAULTS." TI DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, REGARDING SUCH ITEMS, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF ANY THIRD PARTY PATENTS, COPYRIGHTS, TRADE SECRETS OR OTHER INTELLECTUAL PROPERTY RIGHTS. 6.2 EXCEPT FOR THE LIMITED RIGHT TO USE THE EVM SET FORTH HEREIN, NOTHING IN THESE TERMS AND CONDITIONS SHALL BE CONSTRUED AS GRANTING OR CONFERRING ANY RIGHTS BY LICENSE, PATENT, OR ANY OTHER INDUSTRIAL OR INTELLECTUAL PROPERTY RIGHT OF TI, ITS SUPPLIERS/LICENSORS OR ANY OTHER THIRD PARTY, TO USE THE EVM IN ANY FINISHED END-USER OR READY-TO-USE FINAL PRODUCT, OR FOR ANY INVENTION, DISCOVERY OR IMPROVEMENT MADE, CONCEIVED OR ACQUIRED PRIOR TO OR AFTER DELIVERY OF THE EVM. 7. USER'S INDEMNITY OBLIGATIONS AND REPRESENTATIONS. USER WILL DEFEND, INDEMNIFY AND HOLD TI, ITS LICENSORS AND THEIR REPRESENTATIVES HARMLESS FROM AND AGAINST ANY AND ALL CLAIMS, DAMAGES, LOSSES, EXPENSES, COSTS AND LIABILITIES (COLLECTIVELY, "CLAIMS") ARISING OUT OF OR IN CONNECTION WITH ANY HANDLING OR USE OF THE EVM THAT IS NOT IN ACCORDANCE WITH THESE TERMS AND CONDITIONS. THIS OBLIGATION SHALL APPLY WHETHER CLAIMS ARISE UNDER STATUTE, REGULATION, OR THE LAW OF TORT, CONTRACT OR ANY OTHER LEGAL THEORY, AND EVEN IF THE EVM FAILS TO PERFORM AS DESCRIBED OR EXPECTED. 8. Limitations on Damages and Liability: 8.1 General Limitations. IN NO EVENT SHALL TI BE LIABLE FOR ANY SPECIAL, COLLATERAL, INDIRECT, PUNITIVE, INCIDENTAL, CONSEQUENTIAL, OR EXEMPLARY DAMAGES IN CONNECTION WITH OR ARISING OUT OF THESE TERMS ANDCONDITIONS OR THE USE OF THE EVMS PROVIDED HEREUNDER, REGARDLESS OF WHETHER TI HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. EXCLUDED DAMAGES INCLUDE, BUT ARE NOT LIMITED TO, COST OF REMOVAL OR REINSTALLATION, ANCILLARY COSTS TO THE PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, RETESTING, OUTSIDE COMPUTER TIME, LABOR COSTS, LOSS OF GOODWILL, LOSS OF PROFITS, LOSS OF SAVINGS, LOSS OF USE, LOSS OF DATA, OR BUSINESS INTERRUPTION. NO CLAIM, SUIT OR ACTION SHALL BE BROUGHT AGAINST TI MORE THAN ONE YEAR AFTER THE RELATED CAUSE OF ACTION HAS OCCURRED. 8.2 Specific Limitations. IN NO EVENT SHALL TI'S AGGREGATE LIABILITY FROM ANY WARRANTY OR OTHER OBLIGATION ARISING OUT OF OR IN CONNECTION WITH THESE TERMS AND CONDITIONS, OR ANY USE OF ANY TI EVM PROVIDED HEREUNDER, EXCEED THE TOTAL AMOUNT PAID TO TI FOR THE PARTICULAR UNITS SOLD UNDER THESE TERMS AND CONDITIONS WITH RESPECT TO WHICH LOSSES OR DAMAGES ARE CLAIMED. THE EXISTENCE OF MORE THAN ONE CLAIM AGAINST THE PARTICULAR UNITS SOLD TO USER UNDER THESE TERMS AND CONDITIONS SHALL NOT ENLARGE OR EXTEND THIS LIMIT. 9. Return Policy. Except as otherwise provided, TI does not offer any refunds, returns, or exchanges. Furthermore, no return of EVM(s) will be accepted if the package has been opened and no return of the EVM(s) will be accepted if they are damaged or otherwise not in a resalable condition. If User feels it has been incorrectly charged for the EVM(s) it ordered or that delivery violates the applicable order, User should contact TI. All refunds will be made in full within thirty (30) working days from the return of the components(s), excluding any postage or packaging costs. 10. Governing Law: These terms and conditions shall be governed by and interpreted in accordance with the laws of the State of Texas, without reference to conflict-of-laws principles. User agrees that non-exclusive jurisdiction for any dispute arising out of or relating to these terms and conditions lies within courts located in the State of Texas and consents to venue in Dallas County, Texas. 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