Linear Technology 749 Manuale utente

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 749

MULTIDISPLAY LED CONTROLLER

LTC3206

DESCRIPTION

Demonstration circuit 749 is a multi-display LED con-

troller featuring the LTC3206.

The LTC3206 is a highly integrated multi-display LED

controller. This device contains a high efficiency, low

noise fractional step-up/step-down charge pump to

provide power for a main and sub white LED display,

plus an RGB color LED display. The LTC3206 re-

quires only four small ceramic capacitors plus two

resistors to form a complete 3-panel LED power sup-

ply and a current controller.

Maximum currents for the main/sub and RGB dis-

plays are set independently with a single resistor.

Current for each LED is controlled with an internal

current source. Dimming control for all displays is

achieved via a 2-wire I

C interface. The RGB or Sub

panel may be disabled with the ENRGB/S pin. Sixteen

dimming states exist for the main panel, sub panel,

and the red, green, and blue LEDs resulting in up to

4096 color combinations.

The LTC3206 charge pump optimizes efficiency based

on VIN and LED forward voltage conditions. The part

powers-up in step-down mode and automatically

switches to step-up mode once the first LED current

source begins to enter dropout. The charge pump can

also be programmed to be in step-up mode using the

C interface. Internal circuitry prevents inrush cur-

rent and excess input noise during start-up and mode

switching.

QUICK START PROCEDURE

Demonstration circuit 749 is easy to setup to evalu-

ate the performance of the LTC3206. Refer to Figure

1 for the proper measurement equipment setup and

follow the procedure below.

Connect DC749 to the DC590 USB Serial Control-

ler using the supplied 14-conductor ribbon cable

as shown in Figure 1. Refer to the DC590 Quick

Start guide for software installation details.

Attach the supplied USB cable to your computer

and then to the DC590 controller board.

Run the QuickEvalTM program. The program de-

tects the DC749 and displays the LTC3206 con-

trol window (shown in Figure 2).

Attach a 2.7 – 4.5V power source to the VIN and

GND turrets of the DC749 demo board. This is

the V

power supply for the LTC3206 (see appli-

cation schematic).

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 749

MULTIDISPLAY LED CONTROLLER

Figure 1. Proper Measurement Equipment Setup

USING THE LTC3206 QUICKEVAL SOFTWARE

The program provides brightness controls for the

Main, Sub, and RGB LEDs. The two check boxes

allow the Charge Pump to be forced on and the

ENRGB/S pin to be toggled. The three pairs of ra-

dio buttons allow the selection of either the RGB or

Sub panel to be disabled with the ENRGB/S pin,

AUX1 and/or AUX2 to be either Main or Sub LEDs.

There are four demo buttons and a CIE Chromaticity

diagram which allows direct selection of colors.

The LEDS OFF button resets all LEDs to zero, stops

and resets any demonstration in progress. An ad-

dress select button allows the I

C address to be

changed from 00 to FF, however the I

C address of

the LTC3206 is preset to a hexadecimal address of

36.

MAIN and SUB control – These are vertical slide

controls which adjust the main and sub LEDs out-

put from 0% to 100% by clicking on the up and

down arrows, a higher or lower tick, or by clicking

and dragging the slide pointer.

RED, GREEN, and BLUE controls – These are verti-

cal slide controls which allow individual adjustment

of the red, green, and blue LEDs to make any of the

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 749

MULTIDISPLAY LED CONTROLLER

4096 colors available. The hex code and color are

displayed in small boxes below each of the sliders.

They too are adjusted by clicking on the up and

down arrows, a higher or lower tick, or by clicking

and dragging the slide pointer.

CIE Chromaticity diagram – Colors can be selected

by clicking on a specific color in the diagram. The

Gammut box, when checked, displays the Chroma-

ticity coordinates of the Nichia NSCM315C RGB

diode forming a triangle or

gammut

of all the colors

which can be produced by that diode.

Force Charge Pump On check box – When this box

is selected the charge pump is forced on. The

charge pump is automatically selected while the

Rainbow and Light Cycle demos are activated, but

returns to its original state when the demos are de-

selected.

ENRGB/S check box – When this box is selected,

the ENRGB/S pin is high. When it is deselected the

pin is low and either the RGB or the Sub panel is

disabled depending on the selection of the

ENRGB/S radio buttons.

ENRGB/S option buttons – If RGB Control is se-

lected, the RGB display will be disabled when the

ENRGB/S box is deselected. If the Sub Control is

selected, the Sub panel will be disabled when the

ENRGB/S box is deselected.

AUX1 & AUX2 Main/Sub option buttons – If the

Main button is selected, the applicable LED will

change illumination with the Main brightness con-

trol. If the Sub button is selected, the applicable

LED will change illumination with the Sub bright-

ness control. The LTC3206’s maximum current set-

tings for the Main, Sub, and RGB panels are set by

R2 and R3 (see the attached DC749 schematic.) R2

= R3 = 15.8K, which set the maximum current to

15mA.

Demo Buttons – These buttons can be selected to

run 4 different demonstrations. Demo 1 and Demo

2 cycle through the brightness levels of the LEDs

using a feathering technique. Demo 4 randomly

changes colors also using the feathering technique.

The feathering technique is done by alternating be-

tween adjacent brightness levels at high speeds

with a duty cycle to produce a certain intensity level

between the two brightness levels (virtual step).

These demos use 7 virtual steps between each

brightness level giving it a total of 120 brightness

levels (8 X 15).

LEDS OFF button – This button will turn the bright-

ness levels to zero on all of the LEDs and will turn

off and reset any active demo.

Select I2C Address button – Typically, the LTC3206

is preprogrammed with the hexadecimal I

C address

of 36, however, a different I

C address may be spe-

cial ordered. In this event the appropriate I

C ad-

dress will need to be selected. To do this, select the

Select I2C Address button. This button will display

UPDATE ADDRESS and the address selection box

will become active. Select the appropriate hexa-

decimal address in the address selection box. Then

select the Select I2C Address button to activate the

new address.

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 749

MULTIDISPLAY LED CONTROLLER

Figure 2. LTC3206 Control Window

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D D

C C

B B

A A

Vin

2.7V to 4.5V

NOTES: UNLESS OTHERWISE SPECIFIED

1%5%

DC749A LTC3206EUF

Multidisplay LED Controller

LINEAR TECHNOLOGY CORPORATION

1630 McCarthy Blvd.

Milpitas, CA. 95035

Phone : (408) 954-8400 Fax : (408) 434-0507

Custom

1 1Friday, July 30, 2004

Title

Size Document Number Rev

Date: Sheet of

Gnd 1

TP1

SMT 1

LED

WHITE

J19

ENRGB/S

15.8K

J20

DVCC

LED

WHITE

4.7uF

6.3V

LED

WHITE

LED

WHITE

15.8K

LED

WHITE

J11

LED

WHITE

2.2uF

6.3V

4.7uF

6.3V

0.1uF

10V

24LC025

SCLK

Vss

SDA

Vcc

LED

WHITE

A1 1

J12

REDGRNBLU

LED

COLOR

5.1K

2.2uF

6.3V

0.1uF

10V

J13

A2 1

47K

5.1K

J10

S1 1

LTC3206EUF

C1-

SUB1

SDA

DVCC

C2+

C1+

SUB2

C2-

SCL

ENRGB/S

IMS

IRGB

SGND

CPO

VIN

RED

GREEN

BLUE

MAIN4

MAIN3

MAIN2

MAIN1

AUX1

AUX2

PGND

TP2

SMT 1

J14

CPO

M1 1

J21

S2 1

J17

SDA 1

LED

WHITE

HD2X7

0.1uF

10V

J16

IRGB

5.1K

J18

SCL 1

J15

IMS

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Linear Technology Corporation

LTC3206EUF

Bill Of Material

Demo Bd. #749A

6/20/2005

Item Qty Reference Part Description Manufacture / Part #

1 3 C4,C5,C7 CAP., CHIP X5R 0.1uF 10V 10% AVX, 0402ZD104K 0402

2 2 C1,C2 CAP., CHIP X5R 2.2uF 6.3V 20% TAIYO YUDEN, JMK107BJ225MA 0603

3 2 C3,C6 CAP., CHIP X5R 4.7uF 6.3V TDK C1608X5R0J475M

4 2 J2,J3 TURRET TESTPOINT .064" MILL-MAX, 2308-02

5 8 D1-D8 LED, SMT WHITE NICHIA, NSCW100

D9 LED, SMT COLOR RGB NICHIA, NSCM315C

7 1 J1 SOCKET, 2X7 2MM STRAIGHT MOLEX/WALDOM 87331-1420

8 1 R1 RES., CHIP 82 OHM 5% AAC CR05-820JM 0402

9 3 R5,R6,R7 RES., CHIP 5.1K 5% AAC CR05-512JM 0402

10 2 R2,R3 RES., CHIP 15.8K 1% PANASONIC, ERJ-2RKF1582X 0402

11 1 R4 Res., CHIP 47K 5% AAC CR05-473JM 0402

12 1 U2 IC., SERIAL EEPROM MICROCHIP 24LC025 TSSOP8

13 1 U1 IC., MULTIDISPLAY LED CONTROLLER LINEAR TECHNOLOGY, LTC3206EUF

14 0 TP1,TP2 OPT

Page 1 - of - 1

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