Linear Technology DC1274A Guide de configuration rapide

dc1274af

DEMO MANUAL DC1274A

DESCRIPTION

LTM8040

36V, 1A Step-Down

µModule LED Driver

Demo circuit DC1274A features the LTM

8040 36V, 1A

step-down constant current μModule

LED driver. The

demonstration circuit is designed to drive a single LED

or string of LEDs at up to 1A from a wide input voltage

range. The maximum LED string voltage is 13V and the

minimum voltage varies depending upon the BIAS pin sup-

ply arrangement. The demonstration circuit is assembled

with the BIAS pin connected to the LEDA pin.

The LTM8040 runs at 500kHz switching frequency by

default. DC1274A can be adjusted to raise the switching L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of

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

PERFORMANCE SUMMARY

BOARD PHOTO

frequency, lower the LED current, and implement PWM

dimming. The shutdown feature can be examined by con-

necting the shutdown terminal to ground. The LTM8040

data sheet must be read in conjunction with this demo

manual prior to working on or modifying demo circuit

DC1274A.

Design files for this circuit board are available at

http://www.linear.com/demo

(TA= 25°C)

PARAMETER CONDITIONS/NOTES VALUE

Input Voltage Range ILED = 1A, VLEDA = 3.3V 4V to 36V

Output Current (ILED) R3 = Open 1A

Switching Frequency R2 = Open 500kHz

Maximum Output Voltage (VLEDA), Open LED Voltage 13V

dc1274af

DEMO MANUAL DC1274A

QUICK START PROCEDURE

DC1274A is an easy way to evaluate the LTM8040. Refer

to the test procedures outlined below and Figure 1.

1. Make sure the power supply is less than 36V. With the

supply OFF, connect it to the VIN and GND terminals.

2. Connect an LED or string of LEDs between the LEDA

terminal and the GND terminal. For PWM dimming, the

PWM dimming MOSFET must be added to the PCB and

the string of LEDs must be attached between LEDA and

LED- terminals. However, for simplicity, the MOSFET is

not assembled on the board as shipped.

3. Turn on the input power supply and set the voltage

between 4V and 36V based on the forward voltage of

the LED(s) and desired output current. Please see the

LTM8040 data sheet for details.

4. Tie the shutdown terminal to ground in order to turn

the output off and examine the shutdown operation.

Allow the IC to run by releasing the shutdown terminal

connection to ground. The IC will run with the 100k

pull-up resistor from the shutdown terminal to VIN.

For LEDs or LED strings with a low forward voltage such

as a single red LED, the BIAS terminal can be disconnected

from the output (LPWR) and tied to the input (VIN). There

is a small trace on the back of the PCB (layer 4) that can

be cut in order to disconnect LPWR from BIAS. Please see

the LTM8040 data sheet for details regarding the proper

connection of the BIAS pin.

dc1274af

DEMO MANUAL DC1274A

QUICK START PROCEDURE

Figure 1. Proper Measurement Equipment Setup

–

–+

SHDN

OPTION

+–

OUTPUT CURRENT (mA)

EFFICIENCY (%)

400 800 1000

200 600

24VIN

12VIN

5VIN

Figure 2. Efficiency with Single 3.3VFLED at 1A. LED Current is Adjusted with ADJ Voltage

dc1274af

DEMO MANUAL DC1274A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP, 1210 2.2μF 10% 50V X7R TDK C3225X7R1H225K

2 1 R1 RES, 0402 100k 5% 1/16W VISHAY CRCW0402100KJNED

3 1 U1 IC, MODULE LINEAR TECH. LTM8040EV

Optional Demo Circuit Components

1 0 C2 CAP, 0805 OPT OPT

2 0 Q1 N-CHANNEL MOSFET, SOT-23 OPT OPT

3 0 R2, R3 RES, 0402 OPT OPT

Hardware

1 10 E1-E10 TURRET MILL-MAX 2501-2-00-80-00-00-07-0

dc1274af

DEMO MANUAL DC1274A

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.

SCHEMATIC DIAGRAM

dc1274af

DEMO MANUAL DC1274A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0711 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) 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 LTC 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 LTC 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. LTC assumes no liability for applications assistance,

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

LTC 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 LTC applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

X-ON Electronics

Largest Supplier of Electrical and Electronic Components

Click to view similar products for LED Lighting Development Tools category:

Click to view products by Analog Devices manufacturer:

Other Similar products are found below :

MIC2870YFT EV ADP8860DBCP-EVALZ LM3404MREVAL ADM8843EB-EVALZ TDGL014 ISL97682IRTZEVALZ LM3508TLEV

EA6358NH MAX16826EVKIT MAX16839EVKIT+ TPS92315EVM-516 MAX1698EVKIT MAX6956EVKIT+ OM13321,598 DC986A

DC909A DC824A STEVAL-LLL006V1 IS31LT3948-GRLS4-EB 104PW03F PIM526 PIM527 MAX6946EVKIT+ MAX20070EVKIT#

MAX21610EVKIT# MAX20090BEVKIT# MAX20092EVSYS# PIM498 AP8800EV1 ZXLD1370/1EV4 MAX6964EVKIT

MAX25240EVKIT# MAX25500TEVKITC# MAX77961BEVKIT06# 1216.1013 TPS61176EVM-566 TPS61197EVM TPS92001EVM-628

1270 1271.2004 1272.1030 1273.1010 1278.1010 1279.1002 1279.1001 1282.1000 1293.1900 1293.1800 1293.1700 1293.1500

Table des matières

Autres manuels Linear Technology Carte mère

Linear Technology

Linear Technology DC2226A Guide de configuration rapide

Linear Technology

Linear Technology DC2117A Guide de configuration rapide

Linear Technology

Linear Technology DC1041A-B Manuel utilisateur

Linear Technology

Linear Technology DC2177A-B Guide de configuration rapide

Linear Technology

Linear Technology DC1705C Guide de configuration rapide

Linear Technology

Linear Technology Demo Circuit 1592A Manuel utilisateur

Linear Technology

Linear Technology DC1755A Guide de configuration rapide

Linear Technology

Linear Technology DC1565A Guide de configuration rapide

Linear Technology

Linear Technology DC1684A-B Guide de configuration rapide

Linear Technology

Linear Technology DC1954A Guide de configuration rapide

Linear Technology

Linear Technology DC1398 Manuel utilisateur

Linear Technology

Linear Technology DC1850A-A Guide de configuration rapide

Linear Technology

Linear Technology DC1721B-B Guide de configuration rapide

Linear Technology

Linear Technology DC1659A Manuel utilisateur

Linear Technology

Linear Technology DC1332B Guide de configuration rapide

Linear Technology

Linear Technology DC1703A Guide de configuration rapide

Linear Technology

Linear Technology DC1537A Guide de configuration rapide

Linear Technology

Linear Technology DC1760A Guide de configuration rapide

Linear Technology

Linear Technology LTC2450 Manuel utilisateur

Linear Technology

Linear Technology DC2042A Guide de configuration rapide

Linear Technology

Linear Technology DC1562B Guide de configuration rapide

Linear Technology

Linear Technology Analog Devices DC2564A Guide de configuration rapide

Linear Technology

Linear Technology DC660 Manuel utilisateur

Linear Technology

Linear Technology DC814 Manuel utilisateur

Manuels Carte mère populaires d'autres marques

DFI

DFI SD170 Manuel utilisateur

ASROCK

ASROCK ROMED8-2T Manuel utilisateur

Asus

Asus P2L97A Manuel utilisateur

Winmate

Winmate IC70 Manuel utilisateur

Asus

Asus MES-B Manuel utilisateur

Grantech

Grantech SYS8F377VGGA-3OMN Manuel utilisateur

Telit Wireless Solutions

Telit Wireless Solutions SL869-3DR Manuel utilisateur

Gigabyte

Gigabyte GA-9IVDT Manuel utilisateur

Texas Instruments

Texas Instruments ADS8372EVM Manuel utilisateur

Commell

Commell MS-C73 Manuel utilisateur

IBT Technologies

IBT Technologies MB860 Manuel utilisateur

Nvidia

Nvidia TEGRA DG-04927-001_V01 Manuel utilisateur

Biostar

Biostar M7VIT Bravo Instructions d'utilisation et d'installation

Intel

Intel D33217CK Manuel utilisateur

Asus

Asus F1A55-M LX PLUS R2.0 Manuel utilisateur

EPC

EPC EPC9147C Manuel utilisateur

Asus

Asus EX-B760M-V5 D4 Manuel utilisateur

EPOX

EPOX MU-8KHA0010 Manuel utilisateur