LM46002PWPEVM_技术文档

User's Guide

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LM46002EVM User’s Guide

Introduction

The Texas Instruments LM46002EVM evaluation module (EVM) helps designers evaluate the operation

®

and performance of the LM46002 wide-input voltage Simple Switcher buck regulator. The device offers

configurability in a 1-V to 28-V output voltage, synchronous rectification and a 200-kHz to 2.2-MHz

adjustable frequency range. It also offers external frequency synchronization, power good (PG) flag, and a

precision enable to program undervoltage lockout (UVLO) and internal compensation. The LM46002EVM

is configured for an output voltage of 3.3 V and a switching frequency of 500 kHz. Refer to the LM46002

datasheet for additional features, detailed description and available options.

The EVM contains one DC-DC converter (See Table 1).

Table 1. Device and Package Configurations

CONVERTER

IC

PACKAGE

U1

LM46002

(PWP) HTSSOP-16

Setup

This section describes the test points and connectors on the EVM and how to properly connect, set up

and use the LM46002EVM. Please refer to Figure 1 for a top view of the EVM and relative placement of

the different test points and edge connector.

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Input/Output (I/O) Connector Description

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Figure 1. Top View of LM46002EVM

1

Input/Output (I/O) Connector Description

VIN – Terminal on J2—is the power input terminal for the converter. The terminal edge connector also

provides a power (VIN) and ground (GND) connection to allow the user to attach the EVM to a

cable harness.

VOUT – Terminal on J3—is the regulated output voltage for the converter. The terminal edge connector

also provides a power (VOUT) and ground (GND) connection to allow the user to attach the EVM to

a cable harness.

GND – Terminal on J2 and J3—are the ground reference for the converter. The terminal edge connector

also provides a GND connection for attaching the EVM to a cable harness.

EN – Testpoint—is used to enable the converter by supplying a voltage greater than 2.2 V (typ) or just to

monitor the voltage on this terminal whenever a resistor divider is in place (for precision enable

applications). The LM46002EVM is built for a precision enable application with resistors RENT and

RENB pre-assembled. The regulator will be enabled when VIN > 3.5 V. This threshold can be

calculated by:

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Setup

RENT

RENB

§

·

Enable_ Voltage VIH_EN 1ꢀ

¨

¸

¹

©

where

•

VIH_EN is 2.2 V (typ)

(1)

PG – Testpoint—is used to monitor the power good flag. This flag indicates whether the output voltage

has reached its regulation point. This terminal is an open-drain output that requires a pullup resistor

to the appropriate logic voltage (any voltage less than 14 V). A pre-installed resistor RPG1 of 100

kΩ is tied to the PG terminal and brought out to the PG_PULL UP test point.

PG_PULL UP – Testpoint—is the top connection of the pre-assembled 100-kΩ RPG1 pullup resistor that

ties directly to the open-drain PG terminal. Supply an appropriate voltage to this test point, or tie it

directly to the VOUT test point to observe the PG flag operation.

BIAS – Testpoint—is used to monitor the BIAS voltage. A pre-installed capacitor of 4.7 µF is connected

from the BIAS terminal to ground (GND). This node is connected to VOUT through a zero Ohm

resistor pre-installed on the bottom layer, labeled (RBIAS).

SYNC – Testpoint —is the input terminal for an optional external input clock to the converter. The

external clock frequency must be between 200 kHz and 2.2 MHz, if used. A pulldown resistor of

100 kΩ (RSYNC) is installed on the EVM.

SW – Testpoint—is used to monitor the voltage on the switch terminal and the switching frequency of the

voltage regulator. Remove this test point before making any electromagnetic interference (EMI)

measurements.

VSUPPLY – Edge Connector terminal #9—is used to supply the input voltage through an on board LC

filter (if one is needed for conducted EMI/EMC measurements). The Lin and Cd component pads

are located on the bottom side of the EVM. Please refer to the EVM schematic for initial suggestion

of component values.

2

3

Setup

Set the input voltage (VIN) range for the converter between the operating voltage range of 3.5 V to 60 V. If

a load is driven, it should be applied to the VOUT terminal and should not exceed the maximum load

current of 2 A.

Operation

For proper operation of the LM46002, VIN, GND, and VOUT should be properly configured as stated

above. In this configuration, the device will start up when power is applied and the output voltage of the

regulator (VOUT) will come up to the proper value. The default setting for output voltage of the

LM46002EVM is 3.3 V. Other output voltages can be set by replacing the feedback terminal resistor

dividers RFBT and RFBB; please consult the datasheet for proper selection of these resistor values.

The default frequency for the LM46002EVM is 500 kHz. If other frequencies are desired, within the

frequency range of 200 kHz and 2.2 MHz, the RT resistor value can be changed. Please consult the

datasheet for proper selection of the RT resistor. You must change inductor (L_60V_HC) and total output

capacitance for proper control loop operation.

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Operation

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Schematic

Figure 2. LM46002EVM Schematic

Board Layout

Figure 3 through Figure 7 show the board layout for the LM46002EVM. The EVM offers resistors,

capacitors and test points to configure the output voltage, precision enable terminal, set frequency and

external clock synchronization.

The PWP HTSSOP-16 package offers an exposed thermal pad which must be soldered to the copper

landing on the PCB for optimal thermal performance. The PCB consists of a 4-layer design. There are 2-

oz copper planes on the top and bottom and 1-oz copper mid-layer planes to dissipate heat with an array

of thermal vias under the thermal pad to connect to all four layers.

Test points have been provided for ease of use to connect the power supply, required load and to monitor

critical signals. The 12-terminal edge connector can also be used to facilitate the use of a cable harness if

one is required (refer to the Table 2 section for mating connector part number).

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Operation

Figure 3. Top Assembly Layer

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Operation

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Figure 4. Top Layer Routing

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Operation

Figure 5. Mid Layer 1 Ground Plane

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Operation

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Figure 6. Mid Layer 2 Routing

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Operation

Figure 7. Bottom Layer Routing

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Operation

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Table 2. LM46002EVM Bill of Materials (BOM) for 500 kHz Configuration

Designator

!PCB

Description

Manufacturer

Any

PartNumber

SV601083

Quantity

Printed Circuit Board

1

2

C04, C05

CAP, CERM, 0.022µF, 100V, +/-5%, X7R,

0805

AVX

08051C223JAT2A

CBIAS

CBOOT

CFF

CAP, CERM, 4.7µF, 50V, +/-10%, X5R,

0805

TDK

AVX

C2012X5R1H475K125AB

0805YC474KAT2A

1

CAP, CERM, 0.47µF, 16V, +/-10%, X7R,

0805

CAP, CERM, 100pF, 50V, +/-5%, C0G/NP0,

0603

MuRata

GRM1885C1H101JA01D

GRM21BR72A474KA73L

CIN1

CAP, CERM, 0.47µF, 100V, +/-10%, X7R,

0805

CIN2

CIN3

CAP, CERM, 1µF, 100V, +/-10%, X7R, 1210

MuRata

TDK

GRM32ER72A105KA01L

C5750X7S2A106M

1

CAP, CERM, 10µF, 100V, +/-20%, X7S,

2220

CO1, CO2

CO3

CAP, CERM, 47µF, 10V, +/-10%, X7R, 1210

CAP, CERM, 1µF, 25V, +/-10%, X5R, 0805

MuRata

AVX

GRM32ER71A476KE15L

08053D105KAT2A

2

1

CSS

CAP, CERM, 0.047µF, 50V, +/-10%, X7R,

0603

TDK

C1608X7R1H473K

CVCC1

J1

CAP, CERM, 2.2µF, 10V, +/-10%, X7R,

0603

MuRata

Samtec

GRM188R71A225KE15D

TSW-102-07-G-S

ED120/2DS

1

2

1

Header, TH, 100mil, 2x1, Gold plated, 230

mil above insulator

J2, J3

TERMINAL BLOCK 5.08MM VERT 2POS,

TH

On-Shore

Technology

L_60V_HC

Inductor, Shielded Drum Core, Ferrite,

10µH, 5.35A, 0.0189 ohm, SMD

Coiltronics

DR125-100-R

RBIAS

RENB, RFBT

RENT, RFBB1

RFBB

RES, 0 ohm, 5%, 0.1W, 0603

RES, 1.00Meg ohm, 1%, 0.1W, 0603

RES, 590k ohm, 1%, 0.1W, 0603

RES, 432k ohm, 1%, 0.1W, 0603

RES, 100k ohm, 1%, 0.1W, 0603

TEMP SENSOR RTD 100 OHM 0805

Test Point, TH, Multipurpose, Orange

Test Point, TH, Multipurpose, Red

Test Point, TH, Multipurpose, White

Test Point, TH, Multipurpose, Black

Test Point, TH Multipurpose, Yellow

Vishay-Dale

VISHAY

CRCW06030000Z0EA

CRCW06031M00FKEA

CRCW0603590KFKEA

CRCW0603432KFKEA

CRCW0603100KFKEA

PTS080501B100RP100

5013

1

2

1

2

1

0

1

3

5

RPG1, RSYNC

RTD

TP1

Keystone

TP2

Keystone

5010

TP3

Keystone

5012

TP5, TP9, TP10

Keystone

5011

TP6, TP7, TP8,

TP10, TP11

Keystone

5014

U1

3.5- 60V 2A Step Down Converter

Texas Instruments

Panasonic

LM46002PWP

1

0

Cd, CIN4

CAP, AL, 68µF, 100V, +/-20%, 0.32 ohm,

SMD

EEV-FK2A680Q

CVCC2

Lin

CAP, CERM, 10µF, 10V, +/-20%, X7R, 1206

TDK

C3216X7R1A106M

LPS3314-102MLB

0

Inductor, Shielded Drum Core, Ferrite, 1µH,

2A, 0.06 ohm, SMD

Coilcraft

L_36V_LC

L_60V_LC

OPT

Inductor, Shielded, Powdered Iron, 6.8µH,

6.7A, 0.0334ohm, SMD

Vishay-Dale

Coiltronics

IHLP3232DZER6R8M11

DR74-220-R

0

Inductor, Shielded Drum Core, Ferrite,

22µH, 1.75A, 0.0925 ohm, SMD

Diode, Schottky, 100V, 1.5A, SMA

International

Rectifier

10MQ100NTRPBF

RPG2

RT

RES, 100k ohm, 1%, 0.1W, 0603

RES, 82.5k ohm, 1%, 0.1W, 0603

Shunt, 100mil, Gold plated, Black

Vishay-Dale

3M

CRCW0603100KFKEA

CRCW060382K5FKEA

969102-0000-DA

0

SH-J1

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Revision History

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Revision History

Changes from #IMPLIED Revision (#IMPLIED) to #IMPLIED Revision ......................................................................... Page

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

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ADDITIONAL TERMS AND CONDITIONS, WARNINGS, RESTRICTIONS, AND DISCLAIMERS FOR

EVALUATION MODULES

Texas Instruments Incorporated (TI) markets, sells, and loans all evaluation boards, kits, and/or modules (EVMs) pursuant to, and user

expressly acknowledges, represents, and agrees, and takes sole responsibility and risk with respect to, the following:

1. User agrees and acknowledges that EVMs are intended to be handled and used for feasibility evaluation only in laboratory and/or

development environments. Notwithstanding the foregoing, in certain instances, TI makes certain EVMs available to users that do not

handle and use EVMs solely for feasibility evaluation only in laboratory and/or development environments, but may use EVMs in a

hobbyist environment. All EVMs made available to hobbyist users are FCC certified, as applicable. Hobbyist users acknowledge, agree,

and shall comply with all applicable terms, conditions, warnings, and restrictions in this document and are subject to the disclaimer and

indemnity provisions included in this document.

2. Unless otherwise indicated, EVMs are not finished products and not intended for consumer use. EVMs are intended solely for use by

technically qualified electronics experts who are familiar with the dangers and application risks associated with handling electrical

mechanical components, systems, and subsystems.

3. User agrees that EVMs shall not be used as, or incorporated into, all or any part of a finished product.

4. User agrees and acknowledges that certain EVMs may not be designed or manufactured by TI.

5. User must read the user's guide and all other documentation accompanying EVMs, including without limitation any warning or

restriction notices, prior to handling and/or using EVMs. Such notices contain important safety information related to, for example,

temperatures and voltages. For additional information on TI's environmental and/or safety programs, please visit www.ti.com/esh or

contact TI.

6. User assumes all responsibility, obligation, and any corresponding liability for proper and safe handling and use of EVMs.

7. Should any EVM not meet the specifications indicated in the user’s guide or other documentation accompanying such EVM, the EVM

may be returned to TI within 30 days from the date of delivery for a full refund. THE FOREGOING LIMITED WARRANTY IS THE

EXCLUSIVE WARRANTY MADE BY TI TO USER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR

STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. TI SHALL

NOT BE LIABLE TO USER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES RELATED TO THE

HANDLING OR USE OF ANY EVM.

8. No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or

combination in which EVMs might be or are used. TI currently deals with a variety of customers, and therefore TI’s arrangement with

the user is not exclusive. TI assumes no liability for applications assistance, customer product design, software performance, or

infringement of patents or services with respect to the handling or use of EVMs.

9. User assumes sole responsibility to determine whether EVMs may be subject to any applicable federal, state, or local laws and

regulatory requirements (including but not limited to U.S. Food and Drug Administration regulations, if applicable) related to its handling

and use of EVMs and, if applicable, compliance in all respects with such laws and regulations.

10. User has sole responsibility to ensure the safety of any activities to be conducted by it and its employees, affiliates, contractors or

designees, with respect to handling and using EVMs. Further, user is responsible to ensure that any interfaces (electronic and/or

mechanical) between EVMs 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.

11. User shall employ reasonable safeguards to ensure that user’s use of EVMs will not result in any property damage, injury or death,

even if EVMs should fail to perform as described or expected.

12. User shall be solely responsible for proper disposal and recycling of EVMs consistent with all applicable federal, state, and local

requirements.

Certain Instructions. User shall operate EVMs within TI’s recommended specifications and environmental considerations per the user’s

guide, accompanying documentation, and any other applicable requirements. Exceeding the specified ratings (including but not limited to

input and output voltage, current, power, and environmental ranges) for EVMs may cause property damage, personal injury or death. If

there are questions concerning these ratings, 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 result in unintended and/or inaccurate

operation and/or possible permanent damage to the EVM and/or interface electronics. Please consult the applicable EVM user's guide prior

to connecting any load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative. During

normal operation, some circuit components may have case temperatures greater than 60°C as long as the input and output are maintained

at a normal ambient operating temperature. These components include but are not limited to linear regulators, switching transistors, pass

transistors, and current sense resistors which can be identified using EVMs’ schematics located in the applicable EVM user's guide. When

placing measurement probes near EVMs during normal operation, please be aware that EVMs may become very warm. As with all

electronic evaluation tools, only qualified personnel knowledgeable in electronic measurement and diagnostics normally found in

development environments should use EVMs.

Agreement to Defend, Indemnify and Hold Harmless. User agrees to defend, indemnify, and hold TI, its directors, officers, employees,

agents, representatives, affiliates, 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 and/or use of EVMs. User’s

indemnity shall apply whether Claims arise under law of tort or contract or any other legal theory, and even if EVMs fail to perform as

described or expected.

Safety-Critical or Life-Critical Applications. If user intends to use EVMs in evaluations of safety critical applications (such as life support),

and a failure of a TI product considered for purchase by user for use in user’s product would reasonably be expected to cause severe

personal injury or death such as devices which are classified as FDA Class III or similar classification, then user must specifically notify TI

of such intent and enter into a separate Assurance and Indemnity Agreement.

RADIO FREQUENCY REGULATORY COMPLIANCE INFORMATION FOR EVALUATION MODULES

Texas Instruments Incorporated (TI) evaluation boards, kits, and/or modules (EVMs) and/or accompanying hardware that is marketed, sold,

or loaned to users may or may not be subject to radio frequency regulations in specific countries.

General Statement for EVMs Not Including a Radio

For EVMs not including a radio and not subject to the U.S. Federal Communications Commission (FCC) or Industry Canada (IC)

regulations, TI intends EVMs to be used only for engineering development, demonstration, or evaluation purposes. EVMs are not finished

products typically fit for general consumer use. EVMs may nonetheless generate, use, or radiate radio frequency energy, but have not been

tested for compliance with the limits of computing devices pursuant to part 15 of FCC or the ICES-003 rules. Operation of such EVMs may

cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may

be required to correct this interference.

General Statement for EVMs including a radio

User Power/Frequency Use Obligations: For EVMs including a radio, the radio included in such EVMs is intended for development and/or

professional use only in legally allocated frequency and power limits. Any use of radio frequencies and/or power availability in such EVMs

and their development application(s) must comply with local laws governing radio spectrum allocation and power limits for such EVMs. It is

the user’s sole responsibility to only operate this radio in legally acceptable frequency space and within legally mandated power limitations.

Any exceptions to this are strictly prohibited and unauthorized by TI unless user has obtained appropriate experimental and/or development

licenses from local regulatory authorities, which is the sole responsibility of the user, including its acceptable authorization.

U.S. Federal Communications Commission Compliance

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 could void the user's authority to operate the equipment.

FCC Interference Statement for Class A EVM devices

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 its own expense.

FCC Interference Statement for Class B EVM devices

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.

Industry Canada Compliance (English)

For EVMs Annotated as IC – INDUSTRY CANADA Compliant:

This Class A or B digital apparatus complies with Canadian ICES-003.

Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the

equipment.

Concerning EVMs Including Radio Transmitters

This device complies with Industry Canada licence-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.

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.

Canada Industry Canada Compliance (French)

Cet appareil numérique de la classe A ou B est conforme à la norme NMB-003 du Canada

Les changements ou les modifications pas expressément approuvés par la partie responsable de la conformité ont pu vider l’autorité de

l'utilisateur pour actionner l'équipement.

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.

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.

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

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Important Notice for Users of EVMs Considered “Radio Frequency Products” in Japan

EVMs entering Japan are NOT certified by TI as conforming to Technical Regulations of Radio Law of Japan.

If user uses EVMs in 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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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

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型号：	LM46002PWPEVM
厂家：	TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS
描述：	evaluation module (EVM) helps designers evaluate the operation
文件：	总16页 (文件大小：1054K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LM46002PWPEVM [TAOS]

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