LM317A-337N-EVM User Guide Datasheet by Texas Instruments

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LM317A-337N-EVM
User's Guide
Literature Number: SNLU193
January 2016
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Contents
Contents
1 Introduction......................................................................................................................... 3
1.1 Features....................................................................................................................... 3
2 Setup.................................................................................................................................. 4
2.1 Input/Output Connector Description....................................................................................... 4
2.2 Test Point Description....................................................................................................... 4
2.3 Board Setup .................................................................................................................. 4
2.3.1 How to Set the Output Voltage.................................................................................... 4
2.3.2 Evaluation............................................................................................................ 4
3 Operation............................................................................................................................ 6
3.1 Positive Input Power-Up and Power-Down (SOT-223) ................................................................. 6
3.2 Negative Input Power-Up and Power-Down (SOT-223)................................................................ 8
4 Board Layout..................................................................................................................... 10
5 Schematic ......................................................................................................................... 12
6 Related Documentation....................................................................................................... 14
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Introduction
Chapter 1
SNLU193January 2016
Introduction
The Texas Instruments LM317A-337N-EVM evaluation module (EVM) helps designers operate and
understand the LM317A 3-Terminal Adjustable Regulator and LM337-N 3-Terminal Adjustable Negative
Regulator. The board is assembled with the SOT-223 package option for both devices. This user guide is
meant to provide guidance and examples in order to understand how the EVM can be used to test the
LM317A and LM337-N. For more information about the functional and electrical characteristics of these
devices, consult the LM317A (SNVSAC2) and LM337-N (SNVS778) data sheets.
The EVM contains footprints for two package options of the LM317A adjustable positive regulator and the
LM337-N adjustable negative regulator. (See Table 1-1.)
Table 1-1. Device and Package Configurations
REF DESIGNATOR IC PACKAGE OUTPUT CURRENT
U1 LM317AEMP/NOPB SOT-223 1.0 A
U2 LM317AT/NOPB TO-220 1.5 A
U3 LM337T/NOPB TO-220 – 1.5 A
U4 LM337IMP/NOPB SOT-223 – 1.5 A
1.1 Features
Output voltage adjustable from 1.2 V to 37 V for LM317A and 1.2 V to 37 V for LM337-N
U2 and U3 footprints for TO-220 option evaluation
Heat sink footprint space for TO-220
Large input/output capacitor footprints for customization
Board size: 3.5” × 3.5”
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Setup
Chapter 2
SNLU193January 2016
Setup
This section describes the connectors and test points on the EVM as well as how to properly connect, set
up, and use the LM317A-337N-EVM. Ensure the external power supply is turned off while making
connections on the board.
2.1 Input/Output Connector Description
VBAT+ is the positive input voltage supply for the LM317A.
VBAT- is the negative input voltage supply for the LM337-N.
VOUT+ is the positive output voltage regulated by the LM317A.
VOUT- is the negative output voltage regulated by the LM337-N.
GND is the ground in which all other voltages on the EVM are referenced to. Ground banana jacks are
placed on both the input and output side of the EVM.
2.2 Test Point Description
TP1 – VIN+ is the input to the LM317A.
TP2 – ADJ+ is the adjustment pin of the LM317A.
TP3 – VOUT+ is the output of the LM317A.
TP4 – VIN- is the input to the LM337-N.
TP5 – ADJ- is the adjustment pin of the LM337-N.
TP6 – VOUT- is the output of the LM337-N.
TP7 – GND is the ground rail of the EVM.
2.3 Board Setup
2.3.1 How to Set the Output Voltage
Both the LM317A and LM337-N are designed to sustain a nominal 1.25-V reference voltage VREF.
Details can be found on the data sheets, but most importantly the output voltage for the LM317A is given
by Equation 1.
VOUT+ = VREF (1 + R3/R1) + (IADJ × R3) (1)
The output voltage for the LM337-N is given by Equation 2.
VOUT- = –VREF (1 + R4/R2) + (–IADJ × R4) (2)
IADJ is the current flowing out of the adjustment pin. The EVM will be populated according to a ±5-V output
voltage, but the user can change this according to their needs.
It should be carefully noted that a minimum load current should be established to keep the device under
regulation.
2.3.2 Evaluation
Before applying power to the LM317A-337N-EVM, all external connections should be verified. The
nominal operating conditions that have been tested for the purpose of evaluation are shown in Table 2-1.
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Setup
Important Note: If operation outside Table 2-1 is tested, then proper care should be taken to limit
the power dissipation across the LM317A and LM337-N so that its absolute maximum ratings are
not exceeded. Thermal management techniques such as heatsinks and airflow should be used in
cases of high power dissipation.
Table 2-1. Nominal Operating Conditions
CONNECTOR NAME VOLTAGE
VBAT+ 8 V
VBAT- –8 V
VOUT+ 5 V
VOUT- –5 V
Load for VOUT+ 500 mA
Load for VOUT- –500 mA
Power Dissipation of LM317A/LM337-N 1.5 W
To begin evaluation of the LM317A, an external power supply should be turned off and connected with
proper polarity to the VBAT+ and GND connectors. The VIN+ (TP1) test point can be used to measure the
positive input while the VOUT+ (TP3) test point can be measure the positive output. The ADJ+ (TP2) test
point can be used to measure the adjustment pin of the LM317A.
To evaluate the LM337-N, an external power supply should be turned off and connected with proper
polarity to VBAT- and GND. The VIN- (TP4) test point is used to measure the negative input, while the
VOUT- (TP6) test point is used to measure the negative output. The ADJ- (TP5) test point can be used to
measure the adjustment pin of the LM337-N.
Furthermore, the LM317A-337N-EVM provides solder space for a wide range of input and output
capacitors. Specifically, there is space for electrolytic and ceramic capacitors. At the output, R5 and R6
resistor footprints are provided to add ESR for ceramics. Stock component values can be found on the
schematic (Figure 5-1).
The board also contains footprint space for a TO-220 heat sink, which will aid in heat dissipation for high
power applications. A recommended heat sink is provided in the Bill of Materials section.
Once all connections and components on the LM317A-337N-EVM have been verified, power can be
applied to VBAT+ and/or VBAT-, and evaluation can begin.
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Operation
Chapter 3
SNLU193January 2016
Operation
For the following operation examples, we use the Nominal Operating Conditions as described in Table 2-
1, with only stock components populated:
Input capacitors C1 and C2 with a value of 22 µF
Resistors R1 and R2 with a value of 240
Resistors R3 and R4 with a value of 715
Adjustment capacitors C5 and C6 with a value of 10 µF
Output capacitors C3 and C4 with a value of 22 µF
3.1 Positive Input Power-Up and Power-Down (SOT-223)
In a typical application of the LM317A, a desired positive output voltage is set by selecting the resistor
divider, and the linear regulator will regulate the output to a constant voltage. Linear regulators like the
LM317A span a wide range of applications, all including some form of power management. In this section,
the following conditions are used: input voltage = 8 V, output voltage = 5 V, load = 500 mA, and IC power
dissipation = 1.5 W.
Figure 3-1. Positive Input Power-Up
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Positive Input Power-Up and Power-Down (SOT-223)
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Operation
Figure 3-2. Positive Input Power-Down
Figure 3-3. LM317A Thermal Image (After 5-min Run Time at 1.5 W)
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Negative Input Power-Up and Power-Down (SOT-223)
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Operation
3.2 Negative Input Power-Up and Power-Down (SOT-223)
The LM337-N provides regulation of a negative voltage at the output if the input-output differential is
above the dropout voltage, and the input is within the operating range. The LM337-N finds use in
applications that involve providing a reliable negative rail, such as in bipolar amplifier circuits and op
amps. In this section, the following conditions are used: input voltage = –8 V, output voltage = –5 V, load =
–500 mA, and IC power dissipation = 1.5 W.
Figure 3-4. Negative Input Power-Up
Figure 3-5. Negative Input Power-Down
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Negative Input Power-Up and Power-Down (SOT-223)
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Operation
Figure 3-6. LM337-N Thermal Image (after 5 min run time @ 1.5W)
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Board Layout
Chapter 4
SNLU193January 2016
Board Layout
Figure 4-1,Figure 4-2 and Figure 5-1 show the board layout for the LM317A-337N-EVM. Please note C7,
C8, R5, R6, S1, and S2 will be left unpopulated. If the TO-220 package options for the LM317A and
LM337-N are to be evaluated, then remove U1 and U4, and populate U3 and U2 along with the heatsinks.
Figure 4-1. Top Layer Layout
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Board Layout
Figure 4-2. Bottom Layer Layout
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Schematic
Chapter 5
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Schematic
Figure 5-1. LM317N-LM337N10EVM Schematic
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Schematic
Table 5-1. LM317N-LM337N10EVM Bill of Materials
DESIGNATOR QTY VALUE DESCRIPTION PACKAGE
REFERENCE PART
NUMBER MANUFACTURER
!PCB 1 Printed Circuit Board SV601211 Any
C1, C2, C3, C4 4 22 µF CAP, AL, 22 µF, 50 V, ±20%, 0.88
ohm, SMD SMT Radial D EEE-
FK1H220P Panasonic
C5, C6 2 10 µF CAP, CERM, 10 µF, 50 V, ±10%,
X7R, 1210 1210 GRM32ER7
1H106KA12
LMuRata
D1, D2, D3, D4 4 400 V Diode, Ultrafast, 400 V, 1 A, SMB SMB MURS140-
13-F Diodes Inc.
H1, H2, H3, H4 4 Machine Screw, Round, #4-40 x 1/4,
Nylon, Philips panhead Screw NY PMS
440 0025
PH
B&F Fastener
Supply
H5, H6, H7, H8 4 Standoff, Hex, 0.5"L #4-40 Nylon Standoff 1902C Keystone
J1, J2, J3, J4 4 Standard Banana Jack, Insulated,
Red 6091 6091 Keystone
J5, J6 2 Standard Banana Jack, Insulated,
Black 6092 6092 Keystone
LBL1 1 Thermal Transfer Printable Labels,
1.250" W x 0.250" H - 10,000 per roll
PCB Label
1.25"H x
0.250"W
THT-13-
457-10 Brady
R1, R2 2 RES, 240, 5%, 0.25 W, 1206 1206 CRCW1206
240RJNEA Vishay-Dale
R3, R4 2 RES, 715, 1%, 0.25 W, 1206 1206 CRCW1206
715RFKEA Vishay-Dale
TP1, TP2, TP3,
TP4, TP5, TP6,
TP7 7 White Test Point, Multipurpose, White, TH White
Multipurpose
Testpoint 5012 Keystone
U1 1 3-Terminal Adjustable Regulator, 4-
pin SOT-223, Pb-Free MP04A LM317AEM
P/NOPB Texas Instruments
U4 1 3-Terminal Adjustable Negative
Regulator, 4-pin SOT-223, Pb-Free MP04A LM337IMP/
NOPB Texas Instruments
C7, C8, C9, C10 0 10 µF CAP, CERM, 10 µF, 50 V, ±20%,
X7R, 2220 2220 C5750X7R1
H106M TDK
FID1, FID2,
FID3 0Fiducial mark. There is nothing to buy
or mount. Fiducial —
R5, R6 0 1 RES, 1.0, 5%, 0.25 W, 1206 1206 CRCW1206
1R00JNEA Vishay-Dale
S1, S2 0 Heat Sink, TO-220, Vertical Heat Sink, TO-
220, Vertical FA-T220-
38E Ohmite
U2 0 3-Terminal Adjustable Regulator, 3-
pin TO-220, Pb-Free T03B LM317AT/N
OPB Texas Instruments
U3 0 3-Terminal Adjustable Negative
Regulator, 3-pin TO-220, Pb-Free T03B LM337T/NO
PB Texas Instruments
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Related Documentation
Chapter 6
SNLU193January 2016
Related Documentation
LM317A 3-Terminal Adjustable Positive Regulator data sheet (SNVSAC2)
LM337-N 3-Terminal Adjustable Negative Regulator data sheet (SNVS778)
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.
2Limited 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.
3Regulatory 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.
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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. 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,
2. Use EVMs only after User obtains the license of Test Radio Station as provided in Radio Law of Japan with respect to
EVMs, or
3. 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.
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【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. 電波法施行規則第6条第1項第1号に基づく平成18328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。
2. 実験局の免許を取得後ご使用いただく。
3. 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
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4EVM 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.
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6. Disclaimers:
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