LMZ34002EVM-001

SNVU297 – JULY 2013 Using the LMZ34002: Negative Output Voltage Simple Switcher® Power Module Evaluation Module 1 Introduction The LMZ34002EVM-001 Evaluation Module is designed as an easy-to-use platform that facilitates an extensive evaluation of the features and performance of the Simple Switcher® power module. This guide provides information on the correct usage of the EVM and an explanation of the numerous test points on the board. 2 Description The EVM features a LMZ34002 device configured for operation from a 4.5 V to 40 V input supply. The LMZ34002 is a non-synchronous, buck-boost (negative output) converter optimized for output voltages between -3 V and -17 V. The LMZ34002 operates at a fixed frequency of typically 800 kHz. The output voltage can be set to one of four popular values by using a simple configuration jumper. The EVM can supply up to 2 A of output current depending on the input and output voltage (See Figure 1). A minimal amount of input and output capacitance is used on the board. Component pads are provided for additional input and output capacitors if desired. Test points are provided that allow measurement of efficiency, power dissipation, input ripple, output ripple, line and load regulation, soft-start behavior, transient response, and UVLO behavior. The EVM uses a recommended PCB layout that maximizes thermal performance and minimizes output ripple and noise. 3 Getting Started The host power supply is connected to the EVM at terminal block TB1. The VIN and GND terminals are clearly marked. The terminal block can accept up to number 16 AWG wire. For a complete evaluation, the host supply should be adjustable up to 40 V and be capable of delivering at least 3 A of current. The output of the EVM is presented to terminal block TB2. An electronic or resistive load can be connected to the block. Input and output voltage test points are provided near the terminal blocks. These test points are intended to be used as voltage monitoring points where voltmeters can be connected to measure VIN and VOUT. Do not use these test points as the input supply or output load connection points. The PCB traces connecting to the test points are not designed to support high currents. Before applying power, make certain that the VOUT SELECT (J3) jumper is present and properly positioned for the intended output voltage. Always remove power before changing the jumper settings. Once the jumper setting has been confirmed, set the host input supply to a voltage level between 4.5 V to 40 V, making sure that the sum of VIN + |VOUT| does not exceed 50 V. See Table 1 for the maximum input voltages for the four preset VOUT settings. Turn the host supply ON and then confirm that the selected output voltage is obtained. Table 1. Output Voltage Settings and Maximum VIN VOUT SELECT , J3 (V) MAXIMUM VIN (V) -3.3 40 SNVU297 – JULY 2013 Submit Documentation Feedback -5 40 -12 38 -15 35 Using the LMZ34002: Negative Output Voltage Simple Switcher® Power Module Evaluation Module Copyright © 2013, Texas Instruments Incorporated 1 Test Point Description 4 www.ti.com Test Point Description A number of wire loop test points have been provided as convenient connection points for DVMs or oscilloscope probes to aid in the evaluation of this device. A description of each test point is given in the following text. VIN –VOUT J1 (VIN) J2 (–VOUT) SS INH / UVLO GND PH 5 Input voltage monitoring point. Connect DVM to this point for efficiency measurements. Negative output voltage monitoring point. Connect DVM to this point for efficiency, line regulation, and load regulation measurements. Connect an oscilloscope probe with a short grounding tip to this pair of holes to measure input ripple voltage. Connect an oscilloscope probe with a short grounding tip to this pair of holes to measure output ripple voltage and transient response. The voltage on the soft-start capacitor can be monitored here. Ground this terminal to Inhibit power conversion via an on-board level-shifter. When open, the voltage on this pin is the voltage of the UVLO resistor divider network. Ground points for meters and oscilloscope probes. A via test point for monitoring the Phase pin (Switching Node) of the device with an oscilloscope. This test point can be used to measure the switching frequency of the regulator. Only a x10 oscilloscope probe should be used to monitor this point. The operation of the device can be affected by the stray capacitance of conventional cables or x1 probes. Operation Notes The UVLO threshold of the factory-stock EVM is approximately 4.5 V. The input voltage must be above the UVLO threshold before power conversion begins. The UVLO threshold is set by resistors R6 and R7. See the LMZ34002 datasheet for information on setting the UVLO voltage. When the input voltage rises above the UVLO threshold, power conversion begins and the output voltage will ramp to its final value in approximately 10 ms. If desired, this soft-start interval can be increased by adding capacitance at location C4 on the bottom side of the EVM. This location is not populated on the factory-stock EVM. The switching frequency of the factory-stock EVM is set to 800 kHz (typ) by populating resistor R8 with a 0-Ω resistor. The switching frequency can be changed to 500 kHz by changing R8 to 93.1 kΩ. See the LMZ34002 datasheet for switching frequency limits. The CLK input pin (pin 31) has not been brought out to a test point on the factory-stock EVM. The LMZ34002 is not designed to endure a sustained short circuit on its output. It survives momentary shorts (< 5 seconds), but sustained short circuits may cause permanent damage to the device. The maximum output current is dependent on the input and output voltage. Figure 1 shows the output current limits for four common output voltages over the input voltage range. 2 Using the LMZ34002: Negative Output Voltage Simple Switcher® Power Module Evaluation Module Copyright © 2013, Texas Instruments Incorporated SNVU297 – JULY 2013 Submit Documentation Feedback Maximum Output Current www.ti.com 6 Maximum Output Current Figure 1. LMZ34002 Safe Output Current SNVU297 – JULY 2013 Submit Documentation Feedback Using the LMZ34002: Negative Output Voltage Simple Switcher® Power Module Evaluation Module Copyright © 2013, Texas Instruments Incorporated 3 Schematic 7 www.ti.com Schematic Figure 2. Schematic, LMZ34002 EVM 4 Using the LMZ34002: Negative Output Voltage Simple Switcher® Power Module Evaluation Module Copyright © 2013, Texas Instruments Incorporated SNVU297 – JULY 2013 Submit Documentation Feedback EVM Assembly Drawings and PCB Layout www.ti.com 8 EVM Assembly Drawings and PCB Layout Figure 3. Top Side Components Figure 4. Bottom Side Components SNVU297 – JULY 2013 Submit Documentation Feedback Using the LMZ34002: Negative Output Voltage Simple Switcher® Power Module Evaluation Module Copyright © 2013, Texas Instruments Incorporated 5 EVM Assembly Drawings and PCB Layout www.ti.com Figure 5. Layer 1 Figure 6. Layer 2 6 Using the LMZ34002: Negative Output Voltage Simple Switcher® Power Module Evaluation Module Copyright © 2013, Texas Instruments Incorporated SNVU297 – JULY 2013 Submit Documentation Feedback EVM Assembly Drawings and PCB Layout www.ti.com Figure 7. Layer 3 Figure 8. Layer 4 SNVU297 – JULY 2013 Submit Documentation Feedback Using the LMZ34002: Negative Output Voltage Simple Switcher® Power Module Evaluation Module Copyright © 2013, Texas Instruments Incorporated 7 Bill of Material 9 www.ti.com Bill of Material Table 2. LMZ34002 EVM Bill of Material Qty RefDes Value Description Size Part Number Mfr 2 C1, C2 4.7uF Capacitor, Ceramic, 50V, X7R, 20% 1210 GRM32ER71H475K Murata 1 C3 2.2uF Capacitor, Ceramic, 100V, X7R, 10% 1210 GRF32ER72A225K Murata 0 C4 Do Not Load 0603 1 C5 22uF Capacitor, Electrolytic, 100V 8 x 3.5 (mm) EEU-FC2A220 Panasonic 4 C6, C7, C8, C9 22uF Capacitor, Ceramic, 25V, X5R, 20% 1210 GRM32ER61E226K Murata 0 C10 Do Not Load 8 x 3.5 (mm) 0 J1, J2 Do Not Load 1 J3 PEC04DAAN Header, Male 2x4-pin, 100mil spacing 2 X 4 100mil PEC04DAAN Sullins 1 R1 36.5k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R2 88.7k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R3 21.5k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R4 30.1k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R5 1.15k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R6 174k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R7 63.4k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R8 0 Resistor, Chip, 1/16W, 1% 0603 Std Std 2 TB1, TB2 ED120/2DS Terminal Block, 2-pin, 15-A, 5.1mm 0.40 x 0.35 inch ED120/2DS OST 1 TP1 5010 Test Point, Red, Thru Hole 0.125 x 0.125 inch 5010 Keystone 1 TP2 5014 Test Point, Yellow, Thru Hole 0.125 x 0.125 inch 5014 Keystone 5 TP3-6,9 5011 Test Point, Black, Thru Hole 0.125 x 0.125 inch 5011 Keystone 2 TP7,8 5012 Test Point, White, Thru Hole 0.125 x 0.125 inch 5012 Keystone 0 TP10 1 U1** LMZ34002RKG IC, 5-36V Input, 2A, Buck-Boost, Power Module QFN LMZ34002RKG TI 1 U2 DCX144EH-7 Trans, Prebias, NPN/PNP SOT-563 DCX144EH-7 Diodes 1 -- PCB, LMZ34002 Sample Eval Bd 2 x 4 x 0.062 inch 074-01047 Any Shunt, Black 100-mil 929950-00 3M 076-00447 TI Std Std SJ-5003 3M 1 929950-00 1 EVM Plastic Base, 2 x 4 inch 4 4-40 x 1/4 Stainless Steel Panhead Screw 4 8 Do Not Load SJ-5003 4-40 x 1/4 inch BUMPON HEMISPHERE .44X.20 BLACK Using the LMZ34002: Negative Output Voltage Simple Switcher® Power Module Evaluation Module Copyright © 2013, Texas Instruments Incorporated SNVU297 – JULY 2013 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. 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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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