Texas Instruments LP8861-Q1 Скачать руководство пользователя страница 21

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.

SPACER

SPACER

SPACER

SPACER

SPACER

Содержание LP8861-Q1

Страница 1: ...Using the LP8861 Q1EVM Evaluation Module User s Guide Literature Number SNVU456 July 2015 ...

Страница 2: ... Shutdown Sequence 9 7 Boost Converter 10 7 1 Switching Frequency 10 7 2 Spread Spectrum and Synchronization 10 7 3 Voltage Control 11 8 LED Current Sinks 12 8 1 Output Configuration 12 8 2 Current Setting 12 8 3 Brightness Control 12 9 External Temperature Sensor Functionality 13 9 1 Overview 13 9 2 Calculator 13 10 Fault Detection 13 10 1 Fault Indicator 13 11 Evaluation Board Schematic 14 12 Bi...

Страница 3: ...ISET 12 9 Temperature Compensation Calculator 13 10 Evaluation Board Schematic 14 11 LED Load Board Top Side 17 12 LED Load Board Bottom View 17 13 LED Load Board Schematic Diagram 18 14 Forward Voltage for Cree Xlamp ML B LEDs 19 Excel is a registered trademark of Microsoft Corporation All other trademarks are the property of their respective owners 3 SNVU456 July 2015 List of Figures Submit Docu...

Страница 4: ... to correct this interference 1 4 If You Need Assistance Contact your local TI sales representative 2 Introduction The Texas Instruments LP8861 Q1EVM evaluation module EVM helps designers to evaluate the operation and performance of the LP8861 Q1 device The LP8861 Q1EVM uses the LP8861 Q1 to drive up to 4 LED strings for LCD backlighting with high efficiency Information about output voltage and cu...

Страница 5: ...ng and extend LED life time The input voltage range for LP8861 Q1 is from 4 5 V to 40 V to support car stop start and load dump condition The LP8861 Q1 device supports PWM brightness dimming ratio up to 10 000 1 for input PWM frequency of 200 Hz The device integrates extensive safety and protection features 3 1 Features Four High Precision Current Sinks Current Matching 1 typ Output Current up to ...

Страница 6: ...OINTS CONTROL POINTS Hardware Setup www ti com 4 Hardware Setup Figure 1 shows connectors and main components on the LP8861 Q1 board Figure 1 Evaluation Board Connectors and Setup 6 LP8861 Q1EVM Evaluation Module SNVU456 July 2015 Submit Documentation Feedback Copyright 2015 Texas Instruments Incorporated ...

Страница 7: ...out Figure 2 Top Layer Figure 3 Bottom Layer GND See the LP8861 Q1 datasheet SNVSA50 for PCB layout guidelines 7 SNVU456 July 2015 LP8861 Q1EVM Evaluation Module Submit Documentation Feedback Copyright 2015 Texas Instruments Incorporated ...

Страница 8: ...O logic Device starts when VIN voltage is present and above the VIN UVLO voltage level 4 V and the VDDIO EN voltage is set above threshold voltage 1 2 V By default boost switching frequency is 400 kHz jumper J4 connecting R3 160 kΩ to FSET and boost maximum voltage is 37 V R12 750 kΩ and R13 130 kΩ See Section 7 1 and Section 7 3 for description on how to change boost settings By default LED curre...

Страница 9: ...ce The backlight is shut down LEDs turned off by setting PWM input low or when VDDIO EN 0 If VDDIO EN is set low the LP8861 Q1 will enter low power mode with internal LDO disabled 9 SNVU456 July 2015 LP8861 Q1EVM Evaluation Module Submit Documentation Feedback Copyright 2015 Texas Instruments Incorporated ...

Страница 10: ... frequency remove jumper J4 short pins 7 and 8 on jumper J17 and connect the external resistor to connector J18 Boost internal parameters will be adjusted automatically according to chosen frequency during start up 7 2 Spread Spectrum and Synchronization The SYNC pin is used to enable boost spread spectrum or alternatively to synchronize boost switching with an external frequency To disable spread...

Страница 11: ... 2 V R12 R13 values are in kΩ 2 Figure 7 Converter Maximum Output Voltage vs R12 Maximum voltage should be chosen based on the maximum voltage required for LED strings Recommended maximum voltage is about 30 higher than maximum LED string voltage Initial boost voltage is about 88 of maximum voltage Boost output voltage is adjusted automatically based on LED current sink headroom voltage Default se...

Страница 12: ...o the ISET pin Maximum current can be calculated as follows where VBG 1 2 V RISET current setting resistor R4 kΩ ILED output current per output mA 3 Figure 8 Output Current vs RISET 8 3 Brightness Control The LP8861 Q1 controls the brightness of the display with conventional PWM Output PWM will directly follow the input PWM Input PWM frequency can be in the range of 100 Hz to 20 kHz An external di...

Страница 13: ... to choose components for the temperature compensation with an external NTC Contact your local TI sales representative Figure 9 Temperature Compensation Calculator 10 Fault Detection 10 1 Fault Indicator The LP8861 Q1 has fault detection for LED open and short VIN input overvoltage VIN undervoltage lockout power line overcurrent boost overcurrent and thermal shutdown Open drain FAULT pin indicates...

Страница 14: ...d Schematic www ti com 11 Evaluation Board Schematic Figure 10 Evaluation Board Schematic 14 LP8861 Q1EVM Evaluation Module SNVU456 July 2015 Submit Documentation Feedback Copyright 2015 Texas Instruments Incorporated ...

Страница 15: ...mil above insulator J29 J2 J3 J6 J10 Header TH 100mil 3x1 Gold plated 230 Samtec TSW 103 07 G S 4 mil above insulator J9 J19 J20 J21 J22 CONN HEADER 1POS 100 SNGL TIN Samtec TSW 101 17 T S 9 J23 J24 J27 J30 TH J15 J17 Header TH 100mil 8x2 Gold plated 230 Samtec TSW 108 07 G D 2 mil above insulator J16 Header TH 100mil 10x2 Gold plated Samtec TSW 110 07 G D 1 230 mil above insulator J18 Header TH 1...

Страница 16: ... Dale CRCW060310K0FKEA 1 R20 RES 100k ohm 1 0 1W 0603 Vishay Dale CRCW0603100KFKEA 1 R19 RES 165 k 1 0 1 W 0603 Yageo America RC0603FR 07165KL 1 R21 RES 10 0k ohm 1 0 1W 0603 Yageo America RC0603FR 0710KL 1 R22 RES 0 ohm 5 0 125W 0805 Vishay Dale CRCW08050000Z0EA 1 RT1 Thermistor NTC 10 0k ohm 1 0603 MuRata NCP18XH103F03RB 1 U1 Low EMI High Performance 4 Channel Texas Instruments LP8861PWPQ1 1 1 L...

Страница 17: ... LEDs with maximum current 175 mA and maximum forward voltage 3 5 mA at 80 mA 3 3 V typical are used on the board For theLP8861 Q1 4 strings are assembled NOTE The LED board is not included with the EVM contact your local TI sales representative if board is needed Figure 11 LED Load Board Top Side Figure 12 LED Load Board Bottom View 17 SNVU456 July 2015 LP8861 Q1EVM Evaluation Module Submit Docum...

Страница 18: ... J58 1 2 3 J59 1 2 3 J60 1 2 3 J61 1 2 3 J62 1 2 3 J63 GND 1 2 3 4 J64 D80 D79 D78 D77 D76 D75 D74 D73 1 2 3 J77 1 2 3 J78 1 2 3 J79 1 2 3 J80 1 2 3 J81 1 2 3 J82 1 2 3 J83 1 2 3 J84 GND 1 2 3 4 J85 D100 D99 D98 D97 D96 D95 D94 D93 1 2 3 J98 1 2 3 J99 1 2 3 J100 1 2 3 J101 1 2 3 J102 1 2 3 J103 1 2 3 J104 1 2 3 J105 GND 1 2 3 4 J106 D120 D119 D118 D117 D116 D115 D114 D113 1 2 3 J119 1 2 3 J120 1 2...

Страница 19: ...eader 100mi 2x2 Samtec TSW 102 07 G D 7 J85 J106 J127 J2 J21 J23 J42 J44 J63 Header 100mi 3x1 Samtec TSW 103 07 G S 121 J65 J84 J86 J105 J107 J126 J129 J130 Header 100mi 7x1 Samtec TSW 107 07 G S 1 D1 D120 Cool White SMD LED XLamp mL B Cree MLBAWT A1 0000 000W51 120 Figure 14 Forward Voltage for Cree Xlamp ML B LEDs 19 SNVU456 July 2015 LP8861 Q1EVM Evaluation Module Submit Documentation Feedback ...

Страница 20: ...ring 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 ...

Страница 21: ... 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 rég...

Страница 22: ... 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 cu...

Страница 23: ...F 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 T...

Страница 24: ...esponsible for compliance with all legal regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related information or support that may be provided by TI Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failur...

Страница 25: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments LP8861Q1EVM ...

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