Linear Technology DC2339A Guide de configuration rapide

dc2339af

DEMO MANUAL DC2339A

Description

LT3744

High Current Synchronous

Step-Down LED Driver

Demonstrationcircuit2339Aisahighcurrentsynchronous

step-down LED driver featuring the LT

3744. The unique

drive stage used on the LT3744 allows the anodes of three

LEDs to be connected together for better heat sinking. This

connection will work in both the step-down configuration

and the inverting buck-boost configuration. The pros and

cons of each configuration can be found in the data sheet.

This demonstration circuit 2339A is for customers to test

thestep-downconfiguration only.Theinvertingbuck-boost

configuration is shown in aseparate demonstration circuit.

The input of the demo board is up to 36V. The components

are optimized for the efficiency, thermal and PWM dim-

ming for a 12V input. Each of the three outputs is up to

5V, 20A with a 6.05V maximum output voltage limit. The

PWM1, PWM2 and PWM3 pins are set to low by default.

A DC or PWM signal is required to connect to at least one

of the PWM pins to enable the circuit. At any giving time,

output current only passes through one LED determined

by settings of PWM pins.

The CTRL1, CTRL2 and CTRL3 pins can be adjusted to

provide accurate analog dimming down to 20:1 ratio.

The minimal input voltage for the LT3744 to operate is

3.3V. However, to maintain the output current regulation

in a step down regulator, the minimum input voltage is

determinedbytheLEDvoltageandthemaximum dutycycle.

For a 5V output, the demo board minimum input voltage

will be around 5.5V at room temperature. The load to be

used with this demo board is high current LEDs or laser

diodes. Smaller LEDs may not be able to handle the high

current, even for a short period of time. It is necessary

to mount the LED load on a proper heat sink. A fan may

become necessary to avoid exceeding LED’s maximum

temperate rating.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

The typical efficiency of the demo board is 93.5% from

a12V input to 5V, 20A load. The lower the input voltage,

the higher the efficiency tends to be for a given load. At

output power level of 100W, even one percent of efficiency

improvement is abig advantage in minimizing temperature

rise. If an efficiency measurement is needed in an applica-

tion, the output voltage must be measured at the output

capacitors instead of the LED load. This prevents cable

loss from being counted as a loss of the board.

The demo circuit DC2399A achieves fast current rise time

from 0A to 20A in 5µs. To see the real rise time, connecting

wires between the LED and the board should be as short as

possible to minimize the wire inductance and resistance. It

is recommended to measure the voltage across R32 with

a short 50Ω coax cable directly into a BNC connector on

the oscilloscope. The current can be calculated from the

measured voltage. Figure 1 shows the current rise time. A

current probe adds more delays to the rise time so using

a current probe is not recommended unless rise time is

not a concern.

The LT3744 data sheet gives a complete description of

the part, operation and application information. The data

sheet must be read in conjunction with this quick start

guide for demo circuit 2339A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2339A

dc2339af

DEMO MANUAL DC2339A

Quick start proceDure

Demonstration circuit 2339A is easy to set up to evalu-

ate the performance of the LT3744. Refer to Figure 2 for

proper measurement equipment setup and follow the

procedure below:

1. With power off, connect the input power supply to PVIN

and GND. Note: make sure PVIN is below 36V. Con-

nect a DC supply or a PWMsignal to PWM1, PWM2

and/or PWM3.

2. With power off, connect the LED load to VLED+ and

proper LED1–, LED2–, LED3–according to the setting

of the PWM pins.

3. Turn on the power at the input. Turn on PWM1, PWM2

and/or PWM3.

4. Carefully evaluate other design parameters as needed.

performance summary

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

PVIN Input Supply Voltage VLED+ = 5V 5.5 36 V

VLED+ Maximum Output Voltage 6.05 V

IOUT Output Current CTRL1, CTRL2, CTRL3 = 1.5V 19 20 21 A

fSW Switching Frequency 380 425 470 kHz

EFF Efficiency at DC VIN = 12V, IOUT = 20A, VOUT = 5V 93.5 %

Figure 1. DC2339A Current Rise Time. VIN = 12V, LED Voltage = 4.2V when ON. Total LED Current = 20A

2.00µs/DIV

PWM

2V/DIV

PWM

(YELLOW)

2V/DIV

LED CURRENT

(GREEN)

6.67A/DIV

Description

dc2339af

DEMO MANUAL DC2339A

Figure 2. Proper Measurement Equipment Setup

INPUT

SUPPLY

DC or

PWM

DC or

PWM

DC or

PWM

–

+ –

Quick start proceDure

dc2339af

DEMO MANUAL DC2339A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 6 C1, C2, C24, C25, C30, C31 CAP., X7R, 10µF, 50V, 10%, 1210 MURATA, GRM32ER71H106KA12L

2 2 C4, C5 CAP., ALUM., ELECT., 56µF, 50V SUN ELECT., 50HVT56M

3 1 C6 CAP., X7R, 0.22µF, 25V, 10% 0603 MURATA, GRM188R71E224KA88D

4 1 C7 CAP., X7R, 1µF, 50V, 10% 0805 AVX, 08055C105KAT2A

5 1 C8 CAP., X7R, 22µF, 6.3V, 10% 0805 AVX, 08056D226KAT2A

6 1 C9 CAP., X5R, 47µF, 10V, 10% 1206 MURATA, GRM31CR61A476KE15L

7 3 C11, C12, C16 CAP., POSCAP, 470µF, 6.3V, D4D PANASONIC, 6TPF470MAH

8 1 C14 CAP., X5R, 2.2µF, 25V, 10% 0603 MURATA, GRM188R61E225KA12D

9 4 C18, C21, C22, C23 CAP., X7R, 10nF, 25V, 10% 0603 AVX, 06033C103KAT2A

10 5 C26-C29, C19 CAP., X7R, 1nF, 25V, 10% 0603 AVX, 06033C102KAT2A

11 1 D1 SCHOTTKY RECTIFIER, 40V, SOD523 NXP, PMEG4002EB

12 2 D3, D4 DIODE, BAT54A SOT23 DIODES INC., BAT54A-7-F

13 1 L1 INDUCTOR, 0.82µH Würth Elektronik, 744355182

14 2 Q1, Q2 N-CH., 40-V, PG-TDSON-8 INFINEON, BSC035N04LS G

15 2 Q3, Q5 N-CH., 40-V, PG-TDSON-8 INFINEON, BSC026N04LS

16 3 Q4, Q6, Q7 N-CH., 12-V, PowerPAK SO-8 VISHAY, Si7234DP-T1-GE3

17 3 Q8-Q10 N-CH., 40-V, PG-TDSON-8 FL INFINEON, BSC010N04LS

18 6 R1, R4, R12, R13, R33, R36 RES., CHIP., 0Ω, 1/10W, 0603 VISHAY, CRC06030000Z0EA

19 10 R3, R6-R8, R10, R20-R23, R25 RES., CHIP., 100K, 1/10W, 1% 0603 VISHAY, CRCW0603100KFKEA

20 2 R5, R32 RES., CHIP., 0.003Ω, 3W, 1%, KRL6432 SUSUMU, KRL6432E-M-R003-F

21 1 R14 RES., CHIP., 4.02K, 1/10W, 1% 0603 VISHAY, CRCW06034K02FKEA

22 1 R16 RES., CHIP., 82.5K, 1/10W, 1% 0603 VISHAY, CRCW060382K5FKEA

23 3 R17, R18, R19 RES., CHIP., 309K, 1/10W, 1% 0603 VISHAY, CRCW0603309KFKEA

24 1 R27 RES., CHIP., 1k, 1/10W, 1% 0603 VISHAY, CRCW06031K00FKEA

25 3 R29, R30, R31 RES., CHIP., 25.5k, 1/10W, 1% 0603 VISHAY, CRCW060325K5FKEA

26 1 U1 I.C. LT3744EUHE 36PIN, UHE LINEAR TECH., LT3744EUHE#PBF

Additional Demo Board Circuit Components

1 0 C10, C13, C15(OPT) CAP., D4D

2 0 C17 (OPT) CAP., 0603

3 0 D2(OPT) DIODE, DI123

4 0 R2, R9(OPT) RES., CHIP., 0603

Hardware: For Demo Board Only

1 16 E1-E16 TESTPOINT, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0

2 8 J1-J8 JACK BANANA KEYSTONE, 575-4

3 4 STAND-OFF STAND-OFF, NYLON, 0.25" (SNAP ON) KEYSTONE, 8831

dc2339af

DEMO MANUAL DC2339A

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

Figure 3. F. DC2339A Demo Circuit Schematic

schematic Diagram

1. ALL RESISTORS ARE 0603.

ALL CAPACITORS ARE 0603.

NOTE: UNLESS OTHERWISE SPECIFIED

SEE DEMO MANUAL

PWM1

PWM2

PWM3

PWM1

PWM2

PWM3

E10

CTRL2

R16 82.5K

SGND

C19

1nF

D3-2

BAT54A

3 2

C30

1210

10uF

50V

R27

E14

PWM3

SGND

PVIN

R10

100K

C23

10nF

R12 0

R14

4.02K

100K

BSC035N04LS G

C25

1210

10uF

50V

SYNC

C18 10nF

C15

OPT

R29

25.5K

OPT

LED2-

LED+

E12

PWM1

R22

100K

Si7234DP

50V

C16

470uF

VIN

BSC010N04LS

LT3744EUHE

EN/UVLO

VREF

CTRLT

CTRL1

CTRL2

FB 17

ISP 22

ISN 21

LED_ISN 15

LED_ISP 16

SYNC

PWM1

CTRL3

PWM_OUT3 23

TG 29

SW 30

BOOST 31

BG 32

INTVCC 34

VIN

VEE

PWM2

PWM3

FAULT

VEE

VC1

VC2

VC3

VEE

PWM_OUT1 27

VF NEG 24

PWM_OUT2 25

VEE

SGND 12

VEE

LED1-

PMEG4002EB

1 2

D3-1

BAT54A

C17

OPT

R33

D4-1

BAT54A

3 1

100K

R13 0

Si7234DP

56uF,50V

50HVT56M

E13

PWM2

0.003

KRL6432

OPT

C27

1nF

R18

309K

0.82uH

744355182 C9

47uF

1206

10V

R9 OPT

R19

309K

LED+

R21

100K

LED+

R8 100K

SGND

56uF,50V

50HVT56M

R17

309K

R30

25.5K

R4 0

BSC010N04LS

CTRL1

E15

SGND

C10

OPT

R36

10uF

1210

C24

1210

10uF

50V

SGND

R31

25.5K

E16

SGND

C22

10nF

22uF

6.3V

0805

C13

OPT

C31

1210

10uF

50V

PVIN

3.3V - 36V

C12

470uF

D4-2

BAT54A

3 2

LED+

LED3-

C14

2.2uF

100K

E11

CTRL3

C26 1nF

Si7234DP

R23

100K

EN/UVLO

R20

100K

C29

1nF

BSC026N04LS

R25

100K

1uF

50V

0805

0.22uF

C28

1nF

C11

470uF

Q10

BSC010N04LS

R32

0.003

KRL6432

C21

10nF

dc2339af

DEMO MANUAL DC2339A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2015

LT 0215 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LT C for commercial use. As such, the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LT C from all claims

arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all

appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LT C assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LT C currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

Мы молодая и активно развивающаяся компания в области поставок

электронных компонентов. Мы поставляем электронные компоненты

отечественного и импортного производства напрямую от производителей и с

крупнейших складов мира.

Благодаря сотрудничеству с мировыми поставщиками мы осуществляем

комплексные и плановые поставки широчайшего спектра электронных

компонентов.

Собственная эффективная логистика и склад в обеспечивает надежную

поставку продукции в точно указанные сроки по всей России.

Мы осуществляем техническую поддержку нашим клиентам и

предпродажную проверку качества продукции. На все поставляемые продукты

мы предоставляем гарантию .

Осуществляем поставки продукции под контролем ВП МО РФ на

предприятия военно-промышленного комплекса России , а также работаем в

рамках 275 ФЗ с открытием отдельных счетов в уполномоченном банке. Система

менеджмента качества компании соответствует требованиям ГОСТ ISO 9001.

Минимальные сроки поставки, гибкие цены, неограниченный

ассортимент и индивидуальный подход к клиентам являются основой для

выстраивания долгосрочного и эффективного сотрудничества с предприятиями

радиоэлектронной промышленности, предприятиями ВПК и научно-

исследовательскими институтами России.

С нами вы становитесь еще успешнее!

Наши контакты:

Телефон:

+7 812 627 14 35

Электронная почта:

sales@st-electron.ru

Адрес:

198099, Санкт-Петербург,

Промышленная ул, дом № 19, литера Н,

помещение 100-Н Офис 331

Table des matières

Autres manuels Linear Technology Matériel informatique

Linear Technology

Linear Technology LTC3459ES6 Manuel utilisateur

Linear Technology

Linear Technology DC2169A Guide de configuration rapide

Linear Technology

Linear Technology DC1599A Manuel utilisateur

Linear Technology

Linear Technology LT8608 Manuel utilisateur

Linear Technology

Linear Technology LTC2195 Manuel utilisateur

Linear Technology

Linear Technology DC2430A Guide de configuration rapide

Linear Technology

Linear Technology 1464 Manuel utilisateur

Linear Technology

Linear Technology 968A-D Manuel utilisateur

Linear Technology

Linear Technology LTC2172-12 Manuel utilisateur

Linear Technology

Linear Technology DC1920A Guide de configuration rapide

Linear Technology

Linear Technology LTC6905 Series Manuel utilisateur

Linear Technology

Linear Technology LTC6930 Series Manuel utilisateur

Linear Technology

Linear Technology DC1500A Guide de configuration rapide

Linear Technology

Linear Technology 1060 Manuel utilisateur

Linear Technology

Linear Technology DEMO CIRCUIT 1324A Manuel utilisateur

Linear Technology

Linear Technology LTC1592 Manuel utilisateur

Linear Technology

Linear Technology LTC2430 Manuel utilisateur

Linear Technology

Linear Technology LT3740EDHC Manuel utilisateur

Linear Technology

Linear Technology LTC4227-1 Guide de configuration rapide

Linear Technology

Linear Technology LTC2377-20 Manuel utilisateur

Linear Technology

Linear Technology 1791A Manuel utilisateur

Linear Technology

Linear Technology DC1307A Guide de configuration rapide

Linear Technology

Linear Technology DC2005A Manuel utilisateur

Linear Technology

Linear Technology DC1304A-A Manuel utilisateur

Manuels Matériel informatique populaires d'autres marques

EMC2

EMC2 VNX Series Manuel du propriétaire

Panasonic

Panasonic DV0PM20105 Manuel utilisateur

Mitsubishi Electric

Mitsubishi Electric Q81BD-J61BT11 Manuel utilisateur

Gigabyte

Gigabyte B660M DS3H AX DDR4 Manuel utilisateur

Raidon

Raidon iT2300 Manuel utilisateur

National Instruments

National Instruments PXI-8186 Manuel utilisateur

Hauppauge

Hauppauge WinTV-HVR-2250 Manuel utilisateur

Kontron

Kontron CP6002 Manuel utilisateur

Manhattan

Manhattan 702843 Manuel utilisateur

Aphex

Aphex 230 Manuel utilisateur

AMD

AMD Phenom II Manuel d'exploitation

Intel

Intel NUC 12 Pro Manuel utilisateur

dbx

dbx Zone Pro 1260 Manuel utilisateur

Galaxy

Galaxy GHDX2-2430S-24F4D Manuel utilisateur

Intel

Intel AXXRMFBU4 Manuel utilisateur

Kontron

Kontron DIMM-PC/MD Manuel utilisateur

ST X-NUCLEO-SAFEA1B Mode d'emploi

STEINWAY LYNGDORF

STEINWAY LYNGDORF SP-1 Manuel utilisateur